Assertion and Reason of Class 9 science 10 lessons
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May 16, 2025
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About This Presentation
Here you could find the Assertion and reason questions of class 9 science (physics, chemistry, and biology) 10 lessons. This will be very helpful for those who lack in assertion and reason questions, and also who try to get centum in science.
Slide Content
RAGHUL KRISHNA M B 1 | Science
PHYSICS: CHAPTER-8 FORCE AND LAWS OF MOTION
DIRECTIONS:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Q.1. Assertion : If the net external force on the body is zero, then its acceleration is
zero.
Reason : Acceleration does not depend on force.
Answer: (c) Assertion is true but reason is false.
According to Newton’s second law,
force = acceleration x mass
i.e., if net external force on the body is zero (F = 0), then, the acceleration of a body is
also zero.
Q.2. Assertion : A rocket works on the principle of conservation of linear momentum.
Reason : For two bodies system when there is a change in momentum of one body,
the same change occurs in the momentum of the second body but in the opposite
direction.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
As the fuel in rocket undergoes combustion, the gases so produced leave the body of
the rocket with large velocity and give upthrust to the rocket. If we assume that the
fuel is burnt at a constant rate, then the rate of change of momentum of the rocket
will be constant. As more and more fuel gets burnt, the mass of the rocket goes on
decreasing and it leads to increase of the velocity of rocket more and more rapidly.
Q.3. Assertion : A quick collision between two bodies is more violent than a slow
collision, even when the
initial and the final velocities are identical.
Reason : Because the rate of change of momentum which determines the force is
greater in the first case.
PHYSICS: CHAPTER-8 FORCE AND LAWS OF MOTION
DIRECTIONS:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Q.1. Assertion : If the net external force on the body is zero, then its acceleration is
zero.
Reason : Acceleration does not depend on force.
Answer: (c) Assertion is true but reason is false.
According to Newton’s second law,
force = acceleration x mass
i.e., if net external force on the body is zero (F = 0), then, the acceleration of a body is
also zero.
Q.2. Assertion : A rocket works on the principle of conservation of linear momentum.
Reason : For two bodies system when there is a change in momentum of one body,
the same change occurs in the momentum of the second body but in the opposite
direction.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
As the fuel in rocket undergoes combustion, the gases so produced leave the body of
the rocket with large velocity and give upthrust to the rocket. If we assume that the
fuel is burnt at a constant rate, then the rate of change of momentum of the rocket
will be constant. As more and more fuel gets burnt, the mass of the rocket goes on
decreasing and it leads to increase of the velocity of rocket more and more rapidly.
Q.3. Assertion : A quick collision between two bodies is more violent than a slow
collision, even when the
initial and the final velocities are identical.
Reason : Because the rate of change of momentum which determines the force is
greater in the first case.
RAGHUL KRISHNA M B 2 | Science
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
Q.4. Assertion : When a firefly hits a bus, each of them exerts the same force.
Reason : Firefly has more mass as compared to the windshield.
Answer: (c) Assertion is true but reason is false.
Q.5. Assertion : Linear momentum is conserved in both elastic and inelastic collisions.
Reason : Total energy is conserved in all collisions.
Answer: (b) Both assertion and reason are true but reason is not the correct
explanation of assertion.
Both linear momentum and kinetic energy are conserved in elastic collisions. Linear
momentum is conserved in inelastic collisions but kinetic energy is not conserved. The
total energy is conserved in all collisions.
Q.6. Assertion : Force required to accelerate a mass in two perpendicular directions is
never same.
Reason : The presence of g will not influence the acceleration.
Answer: (c) Assertion is true but reason is false.
Q.7. Assertion : A quick collision between two bodies is more violent than a slow
collision, even when the
initial and the final velocities are identical.
Reason : The rate of change of momentum determines the force.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
In quick collision, time of impact is small which increases the impact of force.
Q.8. Assertion : While walking on ice, one should take small steps to avoid slipping.
Reason : This is because smaller steps ensure smaller friction.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
Q.4. Assertion : When a firefly hits a bus, each of them exerts the same force.
Reason : Firefly has more mass as compared to the windshield.
Answer: (c) Assertion is true but reason is false.
Q.5. Assertion : Linear momentum is conserved in both elastic and inelastic collisions.
Reason : Total energy is conserved in all collisions.
Answer: (b) Both assertion and reason are true but reason is not the correct
explanation of assertion.
Both linear momentum and kinetic energy are conserved in elastic collisions. Linear
momentum is conserved in inelastic collisions but kinetic energy is not conserved. The
total energy is conserved in all collisions.
Q.6. Assertion : Force required to accelerate a mass in two perpendicular directions is
never same.
Reason : The presence of g will not influence the acceleration.
Answer: (c) Assertion is true but reason is false.
Q.7. Assertion : A quick collision between two bodies is more violent than a slow
collision, even when the
initial and the final velocities are identical.
Reason : The rate of change of momentum determines the force.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
In quick collision, time of impact is small which increases the impact of force.
Q.8. Assertion : While walking on ice, one should take small steps to avoid slipping.
Reason : This is because smaller steps ensure smaller friction.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
RAGHUL KRISHNA M B 3 | Science
Q.9. Assertion : From Newton’s second law of motion, impulse is equal to change in
momentum.
Reason : Impulse and momentum have different SI units.
Answer: (d) Both Assertion and Reason are false.
As impulse is equal to change in momentum. Therefore, impulse and momentum
have same SI units.
Q.10. Assertion : Newton’s third law applies to all types of forces. e.g. gravitational,
electric or magnetic forces etc.
Reason : Newton’s third law of motion is applicable only when bodies are in motion.
Answer: (c) Assertion is true but reason is false.
According to third law of motion it is impossible to have a single force out of mutual
interaction between two bodies, whether they are moving or at rest. While, Newton’s
third law is applicable for all types of forces.
Q.11. Assertion : A body is momentarily at rest when it reverses the direction.
Reason : A body cannot have acceleration if its velocity is zero at a given instant of
time.
Answer: (c) Assertion is true but reason is false.
Q.12. Assertion : When a bullet is fired from a gun, there is a forward force on the
bullet and recoil of gun.
Reason : Every action has an equal and opposite reaction.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
Q.13. Assertion : When astronauts throw something in space, that object would
continue moving in the same
direction and with the same speed.
Reason : The acceleration of an object produced by a net applied force is directly
related to the magnitude
of the force, and inversely related to the mass of the object.
Answer: (b) Both assertion and reason are true but reason is not the correct
explanation of assertion.
Q.9. Assertion : From Newton’s second law of motion, impulse is equal to change in
momentum.
Reason : Impulse and momentum have different SI units.
Answer: (d) Both Assertion and Reason are false.
As impulse is equal to change in momentum. Therefore, impulse and momentum
have same SI units.
Q.10. Assertion : Newton’s third law applies to all types of forces. e.g. gravitational,
electric or magnetic forces etc.
Reason : Newton’s third law of motion is applicable only when bodies are in motion.
Answer: (c) Assertion is true but reason is false.
According to third law of motion it is impossible to have a single force out of mutual
interaction between two bodies, whether they are moving or at rest. While, Newton’s
third law is applicable for all types of forces.
Q.11. Assertion : A body is momentarily at rest when it reverses the direction.
Reason : A body cannot have acceleration if its velocity is zero at a given instant of
time.
Answer: (c) Assertion is true but reason is false.
Q.12. Assertion : When a bullet is fired from a gun, there is a forward force on the
bullet and recoil of gun.
Reason : Every action has an equal and opposite reaction.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
Q.13. Assertion : When astronauts throw something in space, that object would
continue moving in the same
direction and with the same speed.
Reason : The acceleration of an object produced by a net applied force is directly
related to the magnitude
of the force, and inversely related to the mass of the object.
Answer: (b) Both assertion and reason are true but reason is not the correct
explanation of assertion.
RAGHUL KRISHNA M B 4 | Science
Q.14. Assertion : A large number of concurrent forces acting at the same point of the
object, then the object will be in equilibrium, if sum of all the forces is equal to zero.
Reason : Equilibrium of a particle in mechanics refers to the situation when the net
external force on the particle is non-zero.
Answer: (c) Assertion is true but reason is false.
Q.15. Assertion : When we sit on a chair, our body exerts a force downward and that
chair needs to exert an equal force upward or the chair will collapse.
Reason : The third law says that for every action there is an equal and opposite
reaction.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
Q.16. Assertion : A table cloth cannot be pulled from a table without dislodging the
dishes.
Reason : Newton’s second law of motion gives definition of inertia.
Answer: (d) Both Assertion and Reason are false.
Q.17. Assertion : Force exerted by the ground on the man moves him forward.
Reason : It is a reactional force.
Answer: (b) Both assertion and reason are true but reason is not the correct
explanation of assertion.
Q.18. Assertion : Mass is a measure of inertia of the body in linear motion.
Reason : Greater the mass, greater is the force required to change its state of rest or
motion.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
According to Newton’s second law of motion, F =ma i.e., magnitude of the
acceleration produced by a given force is inversely proportional to the mass of the
body. Higher is the mass of the body, lesser will be the acceleration produced i.e.,
mass of the body is a measure of the opposition offered by the body to change a
state, when the force is applied i.e., mass of a body is the measure of its inertia.
Q.14. Assertion : A large number of concurrent forces acting at the same point of the
object, then the object will be in equilibrium, if sum of all the forces is equal to zero.
Reason : Equilibrium of a particle in mechanics refers to the situation when the net
external force on the particle is non-zero.
Answer: (c) Assertion is true but reason is false.
Q.15. Assertion : When we sit on a chair, our body exerts a force downward and that
chair needs to exert an equal force upward or the chair will collapse.
Reason : The third law says that for every action there is an equal and opposite
reaction.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
Q.16. Assertion : A table cloth cannot be pulled from a table without dislodging the
dishes.
Reason : Newton’s second law of motion gives definition of inertia.
Answer: (d) Both Assertion and Reason are false.
Q.17. Assertion : Force exerted by the ground on the man moves him forward.
Reason : It is a reactional force.
Answer: (b) Both assertion and reason are true but reason is not the correct
explanation of assertion.
Q.18. Assertion : Mass is a measure of inertia of the body in linear motion.
Reason : Greater the mass, greater is the force required to change its state of rest or
motion.
Answer: (a) Both assertion and reason are true and reason is the correct explanation
of assertion.
According to Newton’s second law of motion, F =ma i.e., magnitude of the
acceleration produced by a given force is inversely proportional to the mass of the
body. Higher is the mass of the body, lesser will be the acceleration produced i.e.,
mass of the body is a measure of the opposition offered by the body to change a
state, when the force is applied i.e., mass of a body is the measure of its inertia.
RAGHUL KRISHNA M B 5 | Science
Q.19. Assertion : Change in momentum is impulse.
Reason : Impulse is the area between (F-t) graph and time axis.
Answer: (b) Both assertion and reason are true but reason is not the correct
explanation of assertion.
Q.20. Assertion : A boy facing forward in a moving bus throws a ball straight up. At
the same instant the bus begins to accelerate. The ball goes up and falls in front of the
boy.
Reason : As the ball rises, velocity remains constant.
Answer: (d) Both Assertion and Reason are false.
Only the horizontal component of velocity of the ball remains unchanged. When the
ball rises the vertical component of velocity keeps on decreasing. During this time the
bus accelerates out under the ball. To the boy the ball appears to go over his head.
The ball, therefore, falls behind him.
PHYSICS: CHAPTER-9 GRAVITATION
DIRECTIONS:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Q.1. Assertion : Universal gravitational constant G is a scalar quantity.
Reason : The value of G is same throughout the universe.
Q.2. Assertion : When distance between two bodies is doubled and also mass of each
body is doubled, then
the gravitational force between them remains the same.
Reason : According to Newton’s law of gravitation, product of force is directly
proportional to the product
mass of bodies and inversely proportional to square of the distance between them.
Q.19. Assertion : Change in momentum is impulse.
Reason : Impulse is the area between (F-t) graph and time axis.
Answer: (b) Both assertion and reason are true but reason is not the correct
explanation of assertion.
Q.20. Assertion : A boy facing forward in a moving bus throws a ball straight up. At
the same instant the bus begins to accelerate. The ball goes up and falls in front of the
boy.
Reason : As the ball rises, velocity remains constant.
Answer: (d) Both Assertion and Reason are false.
Only the horizontal component of velocity of the ball remains unchanged. When the
ball rises the vertical component of velocity keeps on decreasing. During this time the
bus accelerates out under the ball. To the boy the ball appears to go over his head.
The ball, therefore, falls behind him.
PHYSICS: CHAPTER-9 GRAVITATION
DIRECTIONS:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Q.1. Assertion : Universal gravitational constant G is a scalar quantity.
Reason : The value of G is same throughout the universe.
Q.2. Assertion : When distance between two bodies is doubled and also mass of each
body is doubled, then
the gravitational force between them remains the same.
Reason : According to Newton’s law of gravitation, product of force is directly
proportional to the product
mass of bodies and inversely proportional to square of the distance between them.
RAGHUL KRISHNA M B 6 | Science
Q.3. Assertion : A man is sitting in a boat which floats on a pond. If the man drinks
some water from the pond, the level of water in the pond will decrease.
Reason : The weight of the liquid displaced by the body is greater than the weight of
the body.
Q.4. Assertion : During a journey from the earth to the moon and back, maximum
fuel is spent to overcome the earth’s gravity at take off.
Reason : Earth’s mass is much greater than that of the moon.
Q.5. Assertion : Any two objects in the universe attract each other by a force called
gravitation force.
Reason : The force of gravitation exerted by the earth is called gravity.
Q.6. Assertion : An object floats if it displaces an amount of liquid whose weight is
greater than the actual
weight of the object.
Reason : During floatation an object experiences no net force in the downward
direction.
Q.7. Assertion : Weight of a body on earth is equal to the force with which the body is
attracted towards the earth.
Reason : Weight of a body is independent of the mass of the body.
Q.8. Assertion : If we drop a stone and a sheet of paper from a balcony of first floor,
then stone will reach the
ground first.
Reason : The resistance due to air depends on velocity only.
Q.9. Assertion : The density of a liquid depends upon the nature and temperature of
the liquid.
Reason : The volume of the liquid depends upon temperature.
Q.3. Assertion : A man is sitting in a boat which floats on a pond. If the man drinks
some water from the pond, the level of water in the pond will decrease.
Reason : The weight of the liquid displaced by the body is greater than the weight of
the body.
Q.4. Assertion : During a journey from the earth to the moon and back, maximum
fuel is spent to overcome the earth’s gravity at take off.
Reason : Earth’s mass is much greater than that of the moon.
Q.5. Assertion : Any two objects in the universe attract each other by a force called
gravitation force.
Reason : The force of gravitation exerted by the earth is called gravity.
Q.6. Assertion : An object floats if it displaces an amount of liquid whose weight is
greater than the actual
weight of the object.
Reason : During floatation an object experiences no net force in the downward
direction.
Q.7. Assertion : Weight of a body on earth is equal to the force with which the body is
attracted towards the earth.
Reason : Weight of a body is independent of the mass of the body.
Q.8. Assertion : If we drop a stone and a sheet of paper from a balcony of first floor,
then stone will reach the
ground first.
Reason : The resistance due to air depends on velocity only.
Q.9. Assertion : The density of a liquid depends upon the nature and temperature of
the liquid.
Reason : The volume of the liquid depends upon temperature.
RAGHUL KRISHNA M B 7 | Science
Q.10. Assertion : The value of acceleration due to gravity changes with the height,
depth and shape of the earth.
Reason : Acceleration due to gravity is zero at the centre of the earth.
Q.11. Assertion : It is the gravitational force exerted by the sun and the moon on the
sea water that causes to the formation of tides in the sea.
Reason : Gravitational force of attraction is a strong force.
PHYSICS: CHAPTER-10 WORK AND ENERGY
DIRECTIONS:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct
explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct
explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Q.1.
Assertion : Work done by or against gravitational force in moving a body from one point to
another is independent of the actual path followed between the two points.
Reason : Gravitational forces are conservative forces.
Q.2.
Assertion : The work done during a round trip is not zero.
Reason : No force is required to move a body in its round trip.
Q.3.
Assertion : Work done by the gravitational force through a certain distance is constant
irrespective of the fact that the body has a uniform or accelerated motion.
Reason : Gravitational force is a conservative force.
ANSWER:
1.(A) 2.(A) 3.(D) 4.(A) 5.(B) 6.(B) 7.(C) 8.(C) 9.(A) 10.(B) 11.(C)
Q.10. Assertion : The value of acceleration due to gravity changes with the height,
depth and shape of the earth.
Reason : Acceleration due to gravity is zero at the centre of the earth.
Q.11. Assertion : It is the gravitational force exerted by the sun and the moon on the
sea water that causes to the formation of tides in the sea.
Reason : Gravitational force of attraction is a strong force.
PHYSICS: CHAPTER-10 WORK AND ENERGY
DIRECTIONS:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct
explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct
explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Q.1.
Assertion : Work done by or against gravitational force in moving a body from one point to
another is independent of the actual path followed between the two points.
Reason : Gravitational forces are conservative forces.
Q.2.
Assertion : The work done during a round trip is not zero.
Reason : No force is required to move a body in its round trip.
Q.3.
Assertion : Work done by the gravitational force through a certain distance is constant
irrespective of the fact that the body has a uniform or accelerated motion.
Reason : Gravitational force is a conservative force.
ANSWER:
1.(A) 2.(A) 3.(D) 4.(A) 5.(B) 6.(B) 7.(C) 8.(C) 9.(A) 10.(B) 11.(C)
RAGHUL KRISHNA M B 8 | Science
Q.4.
Assertion : The kinetic energy, with any reference, must be positive.
Reason : In the expression for kinetic energy, the velocity appears with power 2 and mass is
a scalar quantity.
Q.5.
Assertion : A crane P lifts a car upto a certain height in 1 min. Another crane Q lifts the same
car upto the same height in 2 min. Then crane P consumes two times more fuel than crane
Q.
Reason : Crane P supplies two times more power than crane Q.
Q.6.
Assertion : Watt hour has units of energy.
Reason : Kilowatt hour (kW h) is the unit of electric power.
Q.7.
Assertion : A light body and heavy body have same momentum. Then they also have same
kinetic energy.
Reason : Kinetic energy depends on mass of the body.
Q.8.
Assertion : A spring has potential energy, both when it is compressed or stretched.
Reason : In compressing or stretching, work is done on the spring against the restoring
force.
Q.9.
Assertion : When the force retards the motion of a body, the work done is negative.
Reason : Work done depends on angle between force and displacement.
Q.10.
Assertion : According to law of conservation of mechanical energy, change in potential
energy is equal and opposite to the change in kinetic energy.
Reason : Mechanical energy is not a conserved quantity.
Q.11.
Assertion : A winded toy car, when placed on floor, starts moving.
Reason : Toy car has kinetic energy stored in it which facilitates its motion.
Q.4.
Assertion : The kinetic energy, with any reference, must be positive.
Reason : In the expression for kinetic energy, the velocity appears with power 2 and mass is
a scalar quantity.
Q.5.
Assertion : A crane P lifts a car upto a certain height in 1 min. Another crane Q lifts the same
car upto the same height in 2 min. Then crane P consumes two times more fuel than crane
Q.
Reason : Crane P supplies two times more power than crane Q.
Q.6.
Assertion : Watt hour has units of energy.
Reason : Kilowatt hour (kW h) is the unit of electric power.
Q.7.
Assertion : A light body and heavy body have same momentum. Then they also have same
kinetic energy.
Reason : Kinetic energy depends on mass of the body.
Q.8.
Assertion : A spring has potential energy, both when it is compressed or stretched.
Reason : In compressing or stretching, work is done on the spring against the restoring
force.
Q.9.
Assertion : When the force retards the motion of a body, the work done is negative.
Reason : Work done depends on angle between force and displacement.
Q.10.
Assertion : According to law of conservation of mechanical energy, change in potential
energy is equal and opposite to the change in kinetic energy.
Reason : Mechanical energy is not a conserved quantity.
Q.11.
Assertion : A winded toy car, when placed on floor, starts moving.
Reason : Toy car has kinetic energy stored in it which facilitates its motion.
RAGHUL KRISHNA M B 9 | Science
Q.12.
Assertion : No work is done when a woman carrying a load on her head, walks on a level
road with a uniform velocity.
Reason : No work is done if force is perpendicular to the direction of displacement.
PHYSICS: CHAPTER-11 SOUND
DIRECTIONS:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation
of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct
explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Q.1.
Assertion : The flash of lightening is seen before the sound of thunder is heard.
Reason : Speed of sound is greater than speed of light.
Q.2.
Assertion : Two persons on the surface of moon cannot talk to each other.
Reason : There is no atmosphere on moon.
Q.3.
Assertion : Sound would travel faster on a hot summer day than on a cold winter day.
Reason : Velocity of sound is directly proportional to the square of its absolute
temperature.
Q.4.
Assertion : Echo is produced when sound is incident on hard and polished surface.
Reason : Sound energy can be totally reflected by objects with soft and loose texture.
ANSWER:
1.(C) 2.(D) 3.(B) 4.(A) 5.(A) 6.(C) 7.(D) 8.(A) 9.(B) 10.(C) 11.(C) 12.(A)
Q.12.
Assertion : No work is done when a woman carrying a load on her head, walks on a level
road with a uniform velocity.
Reason : No work is done if force is perpendicular to the direction of displacement.
PHYSICS: CHAPTER-11 SOUND
DIRECTIONS:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation
of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct
explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Q.1.
Assertion : The flash of lightening is seen before the sound of thunder is heard.
Reason : Speed of sound is greater than speed of light.
Q.2.
Assertion : Two persons on the surface of moon cannot talk to each other.
Reason : There is no atmosphere on moon.
Q.3.
Assertion : Sound would travel faster on a hot summer day than on a cold winter day.
Reason : Velocity of sound is directly proportional to the square of its absolute
temperature.
Q.4.
Assertion : Echo is produced when sound is incident on hard and polished surface.
Reason : Sound energy can be totally reflected by objects with soft and loose texture.
ANSWER:
1.(C) 2.(D) 3.(B) 4.(A) 5.(A) 6.(C) 7.(D) 8.(A) 9.(B) 10.(C) 11.(C) 12.(A)
RAGHUL KRISHNA M B 10 | Science
Q.5.
Assertion : The speed of sound in solids is maximum though their density is large.
Reason : The coefficient of elasticity of solid is large.
Q.6.
Assertion : Compression and rarefaction involve changes in density and pressure.
Reason : When particles are compressed, density of medium increases and when
they are rarefied, density of medium decreases.
Q.7.
Assertion : The velocity of sound in hydrogen gas is less than the velocity of sound in
oxygen gas.
Reason : The density of oxygen is more than the density of hydrogen.
Q.8.
Assertion : The velocity of sound increases with increase in humidity.
Reason : Velocity of sound does not depend upon the medium.
Q.9.
Assertion : The waves in which the individual particles ot the medium move about
their mean positions in a direction perpendicular to the direction of wave
propagation, is known as Transverse waves.
Reason : The loudness or softness of a sound is determined basically by its amplitude.
Q.10.
Assertion : Sound is a form of energy which produces a sensation of hearing in our
ears.
Reason : When you clap, a sound is produced.
Q.11.
Assertion : The matter or substance through which sound is transmitted is called a
medium
Reason : Sound moves through a medium from the point of generation to
the listener.
Q.5.
Assertion : The speed of sound in solids is maximum though their density is large.
Reason : The coefficient of elasticity of solid is large.
Q.6.
Assertion : Compression and rarefaction involve changes in density and pressure.
Reason : When particles are compressed, density of medium increases and when
they are rarefied, density of medium decreases.
Q.7.
Assertion : The velocity of sound in hydrogen gas is less than the velocity of sound in
oxygen gas.
Reason : The density of oxygen is more than the density of hydrogen.
Q.8.
Assertion : The velocity of sound increases with increase in humidity.
Reason : Velocity of sound does not depend upon the medium.
Q.9.
Assertion : The waves in which the individual particles ot the medium move about
their mean positions in a direction perpendicular to the direction of wave
propagation, is known as Transverse waves.
Reason : The loudness or softness of a sound is determined basically by its amplitude.
Q.10.
Assertion : Sound is a form of energy which produces a sensation of hearing in our
ears.
Reason : When you clap, a sound is produced.
Q.11.
Assertion : The matter or substance through which sound is transmitted is called a
medium
Reason : Sound moves through a medium from the point of generation to
the listener.
RAGHUL KRISHNA M B 11 | Science
Q.12.
Assertion : Sound waves are characterised by the motion of particles in the medium
and are called mechanical waves.
Reason : Air is the most common medium through which sound travels.
Q.13.
Assertion : The sound of the human voice is produced due to vibrations in the vocal
cords.
Reason : Vibration means a kind of rapid to and fro motion of an object.
Q.14.
Assertion : Sound is a mechanical wave and needs a material medium like air, water,
steel etc. for its propagation.
Reason : Sound cannot travel through vacuum.
Q.15.
Assertion : Echo is the repetition of sound due to reflection of original sound by a
large and hard obstacle.
Reason : To hear a distinct echo, the time interval between the original sound and the
reflected one must be at least 0.1 sec.
Q.16.
Assertion : A wave is a disturbance that moves through a medium when the particles
of the medium set neighbouring particles into motion.
Reason : A particle of the medium in contact with the vibrating object is first
displaced from its equilibrium position and produces a wave.
Q.17.
Assertion : Human ear converts pressure variations in air with audible frequencies
into electric signals.
Reason : Audible sound lies in the range of 20 to 2000 Hz.
Q.18.
Assertion : Audible sound lies in the range of 20 to 200 Hz.
Reason : Infrasonic sound or Infra-sound has frequency less than 20 Hz.
Q.12.
Assertion : Sound waves are characterised by the motion of particles in the medium
and are called mechanical waves.
Reason : Air is the most common medium through which sound travels.
Q.13.
Assertion : The sound of the human voice is produced due to vibrations in the vocal
cords.
Reason : Vibration means a kind of rapid to and fro motion of an object.
Q.14.
Assertion : Sound is a mechanical wave and needs a material medium like air, water,
steel etc. for its propagation.
Reason : Sound cannot travel through vacuum.
Q.15.
Assertion : Echo is the repetition of sound due to reflection of original sound by a
large and hard obstacle.
Reason : To hear a distinct echo, the time interval between the original sound and the
reflected one must be at least 0.1 sec.
Q.16.
Assertion : A wave is a disturbance that moves through a medium when the particles
of the medium set neighbouring particles into motion.
Reason : A particle of the medium in contact with the vibrating object is first
displaced from its equilibrium position and produces a wave.
Q.17.
Assertion : Human ear converts pressure variations in air with audible frequencies
into electric signals.
Reason : Audible sound lies in the range of 20 to 2000 Hz.
Q.18.
Assertion : Audible sound lies in the range of 20 to 200 Hz.
Reason : Infrasonic sound or Infra-sound has frequency less than 20 Hz.
RAGHUL KRISHNA M B 12 | Science
Q.19.
Assertion : Sounds having more intensity and frequency are louder.
Reason : The loudness of a sound depends on Intensity and frequency.
Q.20.
Assertion : Pitch of a note depends upon its wavelength.
Reason : Sound cannot travel through vacuum.
Q.21.
Assertion : Two persons on the surface of Moon cannot talk to each other.
Reason : Sound cannot travel through vacuum.
Q.22.
Assertion : Ultrasound is an application of ultrasonic waves.
Reason : Sound travels fastest in steel.
Q.23.
Assertion : The particles do not travel all the way from the vibrating object to the ear.
Reason : A particle of the medium in contact with the vibrating object is first
displaced from its equilibrium position.
Q.24.
Assertion : An object moving at a speed greater than the speed of sound is said to be
moving at Supersonic speed.
Reason : Sound travels Faster in solids and liquids than in air.
Q.25.
Assertion : To hear a distinct echo, the tine interval between the original sound and
the reflected one must be at least 0.1 s.
Reason : The sensation of sound persists in our brain for about 0.1 s.
Q.26.
Assertion : On a rainy-day sound travels slower than on a dry day.
Reason : When moisture is absent in air the density of air decreases.
Q.27.
Q.19.
Assertion : Sounds having more intensity and frequency are louder.
Reason : The loudness of a sound depends on Intensity and frequency.
Q.20.
Assertion : Pitch of a note depends upon its wavelength.
Reason : Sound cannot travel through vacuum.
Q.21.
Assertion : Two persons on the surface of Moon cannot talk to each other.
Reason : Sound cannot travel through vacuum.
Q.22.
Assertion : Ultrasound is an application of ultrasonic waves.
Reason : Sound travels fastest in steel.
Q.23.
Assertion : The particles do not travel all the way from the vibrating object to the ear.
Reason : A particle of the medium in contact with the vibrating object is first
displaced from its equilibrium position.
Q.24.
Assertion : An object moving at a speed greater than the speed of sound is said to be
moving at Supersonic speed.
Reason : Sound travels Faster in solids and liquids than in air.
Q.25.
Assertion : To hear a distinct echo, the tine interval between the original sound and
the reflected one must be at least 0.1 s.
Reason : The sensation of sound persists in our brain for about 0.1 s.
Q.26.
Assertion : On a rainy-day sound travels slower than on a dry day.
Reason : When moisture is absent in air the density of air decreases.
Q.27.
RAGHUL KRISHNA M B 13 | Science
Assertion : Transverse waves are not produced in liquids and gases.
Reason : Light waves are transverse wave.
Q.28.
Assertion : Ultrasounds can be used to detect cracks and flaws in metal blocks.
Reason : In stethoscopes the sound of the patient’s heartbeat reaches the doctor’s
ears by multiple reflection of sound.
Q.29.
Assertion : The ceilings of concert halls and conference halls are made curved.
Reason : So that sound reach all parts of the hall after reflection from curved ceilings.
Q.30.
Assertion : SONAR is used underwater.
Reason : Sonar uses ultrasonic waves to measure the distance, direction and speed of
underwater objects.
Q.31.
Assertion : The outer ear is called ‘pinna’.
Reason : When a compression of the medium reaches the eardrum the pressure on
the outside of the membrane increases and forces the eardrum inward.
Q.32.
Assertion : Loud sound can travel a larger distance as it is associated with higher
energy.
Reason : Compression is a part of a longitudinal wave in which the particles of the
medium are closer to one another.
Q.33.
Assertion : With decrease in time period, frequency increases.
Reason : Time period and frequency are inversely proportional.
Q.34.
Assertion : Before playing the orchestra in a musical concert, a sitarist tries to adjust
the tension and pluck the string suitably.
Reason : Frequency is adjusted.
Q.35.
Assertion : Transverse waves are not produced in liquids and gases.
Reason : Light waves are transverse wave.
Q.28.
Assertion : Ultrasounds can be used to detect cracks and flaws in metal blocks.
Reason : In stethoscopes the sound of the patient’s heartbeat reaches the doctor’s
ears by multiple reflection of sound.
Q.29.
Assertion : The ceilings of concert halls and conference halls are made curved.
Reason : So that sound reach all parts of the hall after reflection from curved ceilings.
Q.30.
Assertion : SONAR is used underwater.
Reason : Sonar uses ultrasonic waves to measure the distance, direction and speed of
underwater objects.
Q.31.
Assertion : The outer ear is called ‘pinna’.
Reason : When a compression of the medium reaches the eardrum the pressure on
the outside of the membrane increases and forces the eardrum inward.
Q.32.
Assertion : Loud sound can travel a larger distance as it is associated with higher
energy.
Reason : Compression is a part of a longitudinal wave in which the particles of the
medium are closer to one another.
Q.33.
Assertion : With decrease in time period, frequency increases.
Reason : Time period and frequency are inversely proportional.
Q.34.
Assertion : Before playing the orchestra in a musical concert, a sitarist tries to adjust
the tension and pluck the string suitably.
Reason : Frequency is adjusted.
Q.35.
RAGHUL KRISHNA M B 14 | Science
Assertion : A trough is the lowest point the medium sinks to.
Reason : A crest is the highest point the medium rises to.
Q.36.
Assertion : Megaphones or loudhailers, horns, musical instruments such as trumpets
and shehnais, are all designed to send sound in a particular direction without
spreading it in all directions
Reason : In these instruments, a tube followed by a conical opening reflects sound
successively to guide most of the sound waves from the source in the forward
direction towards the audience.
Q.37.
Assertion : Ultrasound is not used in spiral tube.
Reason : Ultrasound is generally used to clean parts located in hard-to-reach places.
Q.38. Assertion : Stethoscope is a medical instrument used for listening to sounds
produced within the body, mainly in the heart or lungs.
Reason : In stethoscopes the sound of the patient’s heartbeat reaches the doctor’s
ears by multiple reflection of sound
CHEMISTRY: CHAPTER-2 IS MATTER AROUND US PURRE?
DIRECTIONS:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation
of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct
explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Q.1. Assertion : When a beam of light is passed through a colloidal solution placed in
a dark place the path of the beam becomes visible.
Reason : Light gets scattered by the colloidal particles.
ANSWER:
1.(C) 2.(A) 3.(C) 4.(C) 5.(A) 6.(A) 7.(D) 8.(C) 9.(B) 10.(B) 11.(B) 12.(A) 13.(B) 14.(B)
15.(C) 16.(A) 17.(D) 18.(D) 19.(A) 20.(D) 21.(A) 22.(B) 23.(B) 24.(B) 25.(A) 26.(D)
27.(B) 28.(B) 29.(A) 30.(A) 31.(B) 32.(B) 33.(A) 34.(A) 35.(B) 36.(A) 37.(D) 38.(A)
Assertion : A trough is the lowest point the medium sinks to.
Reason : A crest is the highest point the medium rises to.
Q.36.
Assertion : Megaphones or loudhailers, horns, musical instruments such as trumpets
and shehnais, are all designed to send sound in a particular direction without
spreading it in all directions
Reason : In these instruments, a tube followed by a conical opening reflects sound
successively to guide most of the sound waves from the source in the forward
direction towards the audience.
Q.37.
Assertion : Ultrasound is not used in spiral tube.
Reason : Ultrasound is generally used to clean parts located in hard-to-reach places.
Q.38. Assertion : Stethoscope is a medical instrument used for listening to sounds
produced within the body, mainly in the heart or lungs.
Reason : In stethoscopes the sound of the patient’s heartbeat reaches the doctor’s
ears by multiple reflection of sound
CHEMISTRY: CHAPTER-2 IS MATTER AROUND US PURRE?
DIRECTIONS:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation
of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct
explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Q.1. Assertion : When a beam of light is passed through a colloidal solution placed in
a dark place the path of the beam becomes visible.
Reason : Light gets scattered by the colloidal particles.
ANSWER:
1.(C) 2.(A) 3.(C) 4.(C) 5.(A) 6.(A) 7.(D) 8.(C) 9.(B) 10.(B) 11.(B) 12.(A) 13.(B) 14.(B)
15.(C) 16.(A) 17.(D) 18.(D) 19.(A) 20.(D) 21.(A) 22.(B) 23.(B) 24.(B) 25.(A) 26.(D)
27.(B) 28.(B) 29.(A) 30.(A) 31.(B) 32.(B) 33.(A) 34.(A) 35.(B) 36.(A) 37.(D) 38.(A)
RAGHUL KRISHNA M B 15 | Science
Q.2. Assertion : A mixture of benzoic acid and naphthalene can be separated by
crystallization from water.
Reason : Benzoic acid is soluble in hot water but naphthalene is insoluble in hot
water.
Q.3. Assertion : A solution of table salt in a glass of water is homogeneous.
Reason : A solution having different composition throughout is homogeneous.
Q.4. Assertion : A mixture of sugar and benzoic acid can be separated by shaking with
ether.
Reason : Sugar is insoluble in water.
Q.5. Assertion : In sublimation, a substance changes directly from solid to vapour
without passing through
liquid state and vice-versa.
Reason : Distillation involves two processes i.e., vaporisation and condensation.
Q.6. Assertion : True solution exhibits Tyndall effect.
Reason : Particles are very large in size.
Q.7. Assertion : Colloidal solutions are stable and the colloidal particles do not settle
down.
Reason : Brownian movement counters the force of gravity acting on colloidal
particles.
Q.8. Assertion : A solution of table salt in a glass of water is homogeneous.
Reason : A solution having different composition throughout is homogeneous.
Q.9. Assertion : Impure benzoic acid can be purified by sublimation.
Reason : Benzoic acid sublimes on heating.
Q.10. Assertion : Tyndall effect is an optical property.
Reason : Electrophoresis is an electrical property.
Q.11. Assertion : A mixture of acetone and methanol can be separated by fractional
distillation.
Reason : The difference between their boiling points is very less.
Q.2. Assertion : A mixture of benzoic acid and naphthalene can be separated by
crystallization from water.
Reason : Benzoic acid is soluble in hot water but naphthalene is insoluble in hot
water.
Q.3. Assertion : A solution of table salt in a glass of water is homogeneous.
Reason : A solution having different composition throughout is homogeneous.
Q.4. Assertion : A mixture of sugar and benzoic acid can be separated by shaking with
ether.
Reason : Sugar is insoluble in water.
Q.5. Assertion : In sublimation, a substance changes directly from solid to vapour
without passing through
liquid state and vice-versa.
Reason : Distillation involves two processes i.e., vaporisation and condensation.
Q.6. Assertion : True solution exhibits Tyndall effect.
Reason : Particles are very large in size.
Q.7. Assertion : Colloidal solutions are stable and the colloidal particles do not settle
down.
Reason : Brownian movement counters the force of gravity acting on colloidal
particles.
Q.8. Assertion : A solution of table salt in a glass of water is homogeneous.
Reason : A solution having different composition throughout is homogeneous.
Q.9. Assertion : Impure benzoic acid can be purified by sublimation.
Reason : Benzoic acid sublimes on heating.
Q.10. Assertion : Tyndall effect is an optical property.
Reason : Electrophoresis is an electrical property.
Q.11. Assertion : A mixture of acetone and methanol can be separated by fractional
distillation.
Reason : The difference between their boiling points is very less.
RAGHUL KRISHNA M B 16 | Science
Q.12. Assertion : Chloroform and benzene form a pair of miscible liquids and they are
separated by fractional
distillation.
Reason : Boiling point of benzene is less than that of chloroform.
Q.13. Assertion : A mixture of camphor and ammonium chloride cannot be separated
by sublimation.
Reason : Camphor on heating sublimes, ammonium chloride does not.
Q.14. Assertion : A mixture of glucose and m-dinitrobenzene can be separated by
shaking it with ether.
Reason : Glucose is soluble in water.
Q.15. Assertion : Hot water is used for separation of benzoic acid from naphthalene.
Reason : Whenever a crystal is formed it tends to leave out the impurities.
CHEMISTRY: CHAPTER-3 ATOMS AND MOLECULES
DIRECTION:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true
Q.1.
Assertion: The number of particles present in one mole of a substance is fixed.
Reason: The mass of one mole of a substance is equal to its relative atomic mass in
grams.
ANSWER:
1.(A) 2.(A) 3.(C) 4.(C) 5.(B) 6.(D) 7.(A) 8.(C) 9.(A) 10.(B) 11.(A) 12.(C) 13.(C) 14.(B) 15.(B)
Q.12. Assertion : Chloroform and benzene form a pair of miscible liquids and they are
separated by fractional
distillation.
Reason : Boiling point of benzene is less than that of chloroform.
Q.13. Assertion : A mixture of camphor and ammonium chloride cannot be separated
by sublimation.
Reason : Camphor on heating sublimes, ammonium chloride does not.
Q.14. Assertion : A mixture of glucose and m-dinitrobenzene can be separated by
shaking it with ether.
Reason : Glucose is soluble in water.
Q.15. Assertion : Hot water is used for separation of benzoic acid from naphthalene.
Reason : Whenever a crystal is formed it tends to leave out the impurities.
CHEMISTRY: CHAPTER-3 ATOMS AND MOLECULES
DIRECTION:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true
Q.1.
Assertion: The number of particles present in one mole of a substance is fixed.
Reason: The mass of one mole of a substance is equal to its relative atomic mass in
grams.
ANSWER:
1.(A) 2.(A) 3.(C) 4.(C) 5.(B) 6.(D) 7.(A) 8.(C) 9.(A) 10.(B) 11.(A) 12.(C) 13.(C) 14.(B) 15.(B)
RAGHUL KRISHNA M B 17 | Science
Q.2.
Assertion: Atoms always combine to form molecule and ions.
Reason: Atoms of most element are not able to exist independently.
Q.3.
Assertion: Atomicity of ozone is three while that of oxygen is two.
Reason: Atomicity is the number of atoms constituting a molecule.
Q.4.
Assertion: 1 amu equals to 1.66 x 10
-24
g.
Reason: 1.66 x 10
-24
g equal to 1/12
th
mass of a C-12 atom
Q.5.
Assertion: On burning magnesium in oxygen, the mass of magnesium oxide formed is
equal to the total mass of magnesium and oxygen
Reason: In a chemical substance, the elements are always present in a definite
proportion.
Q.6.
Assertion: 1 mole of and H2 each O2 occupy 22.4 L at standard temperature and
pressure.
Reason: Molar volume for all gases at the standard temperature and pressure has the
different values.
Q.7.
Assertion: Molecular weight of oxygen is 16.
Reason: Atomic weight of oxygen is 16.
Q.8.
Assertion: Atomic mass of aluminium is 14.
Reason: An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-
12 atom.
Q.9.
Assertion: The number of moles of He in 52 g of He is 13.
Q.2.
Assertion: Atoms always combine to form molecule and ions.
Reason: Atoms of most element are not able to exist independently.
Q.3.
Assertion: Atomicity of ozone is three while that of oxygen is two.
Reason: Atomicity is the number of atoms constituting a molecule.
Q.4.
Assertion: 1 amu equals to 1.66 x 10
-24
g.
Reason: 1.66 x 10
-24
g equal to 1/12
th
mass of a C-12 atom
Q.5.
Assertion: On burning magnesium in oxygen, the mass of magnesium oxide formed is
equal to the total mass of magnesium and oxygen
Reason: In a chemical substance, the elements are always present in a definite
proportion.
Q.6.
Assertion: 1 mole of and H2 each O2 occupy 22.4 L at standard temperature and
pressure.
Reason: Molar volume for all gases at the standard temperature and pressure has the
different values.
Q.7.
Assertion: Molecular weight of oxygen is 16.
Reason: Atomic weight of oxygen is 16.
Q.8.
Assertion: Atomic mass of aluminium is 14.
Reason: An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-
12 atom.
Q.9.
Assertion: The number of moles of He in 52 g of He is 13.
RAGHUL KRISHNA M B 18 | Science
Reason: The number of moles of an atom is the ratio of its given mass to its molar
mass.
Q.10.
Assertion: The valency of aluminium is 3 and oxygen is 2.
Reason: The chemical formula of aluminium oxide is Al3O2.
Q.11.
Assertion: A molecule is the smallest particle of an element or a compound which is
capable of free existence.
Reason: The number of atoms present in one molecule of the substance is called its
atomicity.
Q.12.
Assertion: Protons cannot be transferred from one atom to another.
Reason: Protons are present deep inside the atom in its nucleus.
Q.13.
Assertion: Water molecules always contain hydrogen and oxygen in the ratio 1:8.
Reason: Water obeys law of constant proportions irrespective of source and method
of preparation.
Q.14.
Assertion: Relative atomic mass of the atom of element is the average masses of the
atom as compared to the mass of one carbon-12 atom.
Reason: Carbon-12 isotope is the standard reference for measuring atomic masses.
Q.15.
Assertion: A sodium ion has positive charge.
Reason: Sodium ion has more protons than a neutral atom.
Q.16.
Assertion : In water, the ratio of mass of hydrogen to the mass of oxygen is always 1:8
whatever the source of water.
Reason : According to law of constant proportion, the elements are always present in
Reason: The number of moles of an atom is the ratio of its given mass to its molar
mass.
Q.10.
Assertion: The valency of aluminium is 3 and oxygen is 2.
Reason: The chemical formula of aluminium oxide is Al3O2.
Q.11.
Assertion: A molecule is the smallest particle of an element or a compound which is
capable of free existence.
Reason: The number of atoms present in one molecule of the substance is called its
atomicity.
Q.12.
Assertion: Protons cannot be transferred from one atom to another.
Reason: Protons are present deep inside the atom in its nucleus.
Q.13.
Assertion: Water molecules always contain hydrogen and oxygen in the ratio 1:8.
Reason: Water obeys law of constant proportions irrespective of source and method
of preparation.
Q.14.
Assertion: Relative atomic mass of the atom of element is the average masses of the
atom as compared to the mass of one carbon-12 atom.
Reason: Carbon-12 isotope is the standard reference for measuring atomic masses.
Q.15.
Assertion: A sodium ion has positive charge.
Reason: Sodium ion has more protons than a neutral atom.
Q.16.
Assertion : In water, the ratio of mass of hydrogen to the mass of oxygen is always 1:8
whatever the source of water.
Reason : According to law of constant proportion, the elements are always present in
RAGHUL KRISHNA M B 19 | Science
definite proportion by mass in a chemical substance.’
Q.17.
Assertion : Ions are always positively charged.
Reason : Ions are formed by losing or gaining of electrons.
Q.18.
Assertion : One mole of SO2 contains double the number of molecules present in one
mole of O2
Reason : Molecular weight of SO2 is double to that of O2
Q.19.
Assertion : When 12 g of CaCO3 is decomposed, 4.6 g of residue is left and 4.4 g of
escapes.
Reason : Law of conservation of mass is followed.
Q.20.
Assertion : Pure water obtained from different sources such as river, well, spring, sea
etc. always contains hydrogen and oxygen combined in the ratio of 1 : 8 by mass.
Reason : A chemical compound always contains same elements combined in different
fixed proportion by mass.
Q.21.
Assertion : Law of conservation of mass holds good for all the reactions.
Reason : I state that energy can neither be created nor destroyed in a chemical
reaction.
Q.22.
Assertion : Atomicity of oxygen is 4.
Reason : 1 mole of an element contains 6.023 x 10
23
atoms.
Q.23.
Assertion : Atomicity of O3 is 2.
Reason : 1 mole of an element contains 6.023 x 10
23
atoms.
definite proportion by mass in a chemical substance.’
Q.17.
Assertion : Ions are always positively charged.
Reason : Ions are formed by losing or gaining of electrons.
Q.18.
Assertion : One mole of SO2 contains double the number of molecules present in one
mole of O2
Reason : Molecular weight of SO2 is double to that of O2
Q.19.
Assertion : When 12 g of CaCO3 is decomposed, 4.6 g of residue is left and 4.4 g of
escapes.
Reason : Law of conservation of mass is followed.
Q.20.
Assertion : Pure water obtained from different sources such as river, well, spring, sea
etc. always contains hydrogen and oxygen combined in the ratio of 1 : 8 by mass.
Reason : A chemical compound always contains same elements combined in different
fixed proportion by mass.
Q.21.
Assertion : Law of conservation of mass holds good for all the reactions.
Reason : I state that energy can neither be created nor destroyed in a chemical
reaction.
Q.22.
Assertion : Atomicity of oxygen is 4.
Reason : 1 mole of an element contains 6.023 x 10
23
atoms.
Q.23.
Assertion : Atomicity of O3 is 2.
Reason : 1 mole of an element contains 6.023 x 10
23
atoms.
RAGHUL KRISHNA M B 20 | Science
Q.24.
Assertion : 52g of He contains 13 x 6.023 x 10
23
atoms.
Reason : 1 mole of an element contains 6.023 x 10
23
atoms.
Q.25.
Assertion: Atoms can neither be sub-divided, created nor destroyed.
Reason: This postulate of Dalton’s theory is the result of law of constant proportion.
Q.26.
Assertion: Carbonates are polyatomic ions.
Reason: The carbonate ion consists of one carbon atom and three oxygen atoms and
carries an overall charge of.
Q.27.
Assertion : Number of gram-molecules of SO2Cl2 in 13.5 g of sulphur chloride is 0.1.
Reason : Gram molecular mass is equal to two-gram molecule.
Q.28.
Assertion : The total number of electrons present in 16 g of methane gas is 6.022 x
10
23
Reason : 1 mole of an element contains 6.023 x 10
23
atoms.
Q.29.
Assertion : All noble gases are monoatomic.
Reason : Noble gases are highly stable and unreactive.
CHEMISTRY: CHAPTER-4 STRUCTURE OF THE ATOM
DIRECTIONS:
ANSWER:
1.(A) 2.(D) 3.(A) 4.(A) 5.(B) 6.(C) 7.(D) 8.(A) 9.(A) 10.(C) 11.(B) 12.(A) 13.(A) 14.(C)
15.(C) 16.(A) 17.(D) 18.(D) 19.(D) 20.(C) 21.(A) 22.(D) 23.(D) 24.(A) 25.(C) 26.(A)
27.(C) 28.(A) 29.(A)
Q.24.
Assertion : 52g of He contains 13 x 6.023 x 10
23
atoms.
Reason : 1 mole of an element contains 6.023 x 10
23
atoms.
Q.25.
Assertion: Atoms can neither be sub-divided, created nor destroyed.
Reason: This postulate of Dalton’s theory is the result of law of constant proportion.
Q.26.
Assertion: Carbonates are polyatomic ions.
Reason: The carbonate ion consists of one carbon atom and three oxygen atoms and
carries an overall charge of.
Q.27.
Assertion : Number of gram-molecules of SO2Cl2 in 13.5 g of sulphur chloride is 0.1.
Reason : Gram molecular mass is equal to two-gram molecule.
Q.28.
Assertion : The total number of electrons present in 16 g of methane gas is 6.022 x
10
23
Reason : 1 mole of an element contains 6.023 x 10
23
atoms.
Q.29.
Assertion : All noble gases are monoatomic.
Reason : Noble gases are highly stable and unreactive.
CHEMISTRY: CHAPTER-4 STRUCTURE OF THE ATOM
DIRECTIONS:
ANSWER:
1.(A) 2.(D) 3.(A) 4.(A) 5.(B) 6.(C) 7.(D) 8.(A) 9.(A) 10.(C) 11.(B) 12.(A) 13.(A) 14.(C)
15.(C) 16.(A) 17.(D) 18.(D) 19.(D) 20.(C) 21.(A) 22.(D) 23.(D) 24.(A) 25.(C) 26.(A)
27.(C) 28.(A) 29.(A)
RAGHUL KRISHNA M B 21 | Science
(a) Both assertion and reason are true, and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true, but reason is not the correct explanation of
assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true.
Q.1.
Assertion: For noble gases, valency is zero.
Reason: Noble gases have 8 valence electrons.
Q.2.
Assertion: Thomson’s atomic model is known as ‘raisin pudding’ model.
Reason: The atom is visualized as a pudding of positive charge with electrons (raisins)
embedded in it.
Q.3.
Assertion: The mass of the total number of protons and neutrons is a measure of the
approximate mass of an atom.
Reason: The mass of an electron is negligible.
Q.4.
Assertion: Electrons moving in the same orbit will lose or gain energy.
Reason: On jumping from higher to lower energy level, the electron will gain energy
Q.5.
Assertion: Isotopes are electrically neutral.
Reason: Isotopes are species with same mass number but different atomic numbers
Q.6. Assertion: Atom is electrically neutral.
Reason: A neutral particle, neutron is present in the nucleus of atom.
(a) Both assertion and reason are true, and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true, but reason is not the correct explanation of
assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true.
Q.1.
Assertion: For noble gases, valency is zero.
Reason: Noble gases have 8 valence electrons.
Q.2.
Assertion: Thomson’s atomic model is known as ‘raisin pudding’ model.
Reason: The atom is visualized as a pudding of positive charge with electrons (raisins)
embedded in it.
Q.3.
Assertion: The mass of the total number of protons and neutrons is a measure of the
approximate mass of an atom.
Reason: The mass of an electron is negligible.
Q.4.
Assertion: Electrons moving in the same orbit will lose or gain energy.
Reason: On jumping from higher to lower energy level, the electron will gain energy
Q.5.
Assertion: Isotopes are electrically neutral.
Reason: Isotopes are species with same mass number but different atomic numbers
Q.6. Assertion: Atom is electrically neutral.
Reason: A neutral particle, neutron is present in the nucleus of atom.
RAGHUL KRISHNA M B 22 | Science
Q.7.
Assertion: The size of the nucleus is very small as compared to the size of the atom.
Reason: The electrons revolve around the nucleus of the atom
Q.8.
Assertion: Isotopes are electrically neutral.
Reason: Isotopes of an element have equal number of protons and electrons.
Q.9.
Assertion: Isobars are identical in chemical properties.
Reason: Isobars have same atomic number.
Q.10.
Assertion: Anions are larger in size than the parent atom.
Reason: In an anion, the number of protons in the nucleus is less than the number of
electrons moving around it
BIOLOGY: CH-5 THE FUNDAMENTAL UNIT OF LIFE
DIRECTIONS:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation
of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct
explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Q.1.
Assertion : A cell swells up when present in a hypotonic solution.
Reason : More water molecules enter the cell than they leave.
ANSWER:
1.(A) 2.(A) 3.(A) 4.(D) 5.(C) 6.(B) 7.(B) 8.(A) 9.(D) 10.(A)
Q.7.
Assertion: The size of the nucleus is very small as compared to the size of the atom.
Reason: The electrons revolve around the nucleus of the atom
Q.8.
Assertion: Isotopes are electrically neutral.
Reason: Isotopes of an element have equal number of protons and electrons.
Q.9.
Assertion: Isobars are identical in chemical properties.
Reason: Isobars have same atomic number.
Q.10.
Assertion: Anions are larger in size than the parent atom.
Reason: In an anion, the number of protons in the nucleus is less than the number of
electrons moving around it
BIOLOGY: CH-5 THE FUNDAMENTAL UNIT OF LIFE
DIRECTIONS:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation
of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct
explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Q.1.
Assertion : A cell swells up when present in a hypotonic solution.
Reason : More water molecules enter the cell than they leave.
ANSWER:
1.(A) 2.(A) 3.(A) 4.(D) 5.(C) 6.(B) 7.(B) 8.(A) 9.(D) 10.(A)
RAGHUL KRISHNA M B 23 | Science
Q.2.
Assertion : The endoplasmic reticulum which lacks ribosomes is called smooth
endoplasmic reticulum
Reason : SER is mainly involved in protein synthesis.
Q.3.
Assertion : Mitochondria and chloroplasts are semiautonomous organelles.
Reason : They are formed by division of pre-existing organelles and contain DNA but
lack protein synthesizing machinery.
Q.4.
Assertion : Plasma membrane is selectively permeable.
Reason : Plasma membrane allows some molecules to pass through it more easily
than others.
Q.5.
Assertion : Leucoplasts perform photosynthesis.
Reason : Chloroplasts store fats, starch and proteins.
Q.6. Assertion : Cell wall is a non-living part of the cell.
Reason : It offers protection, definite shape and support.
Q.7. Assertion : A cell membrane shows fluid behaviour.
Reason : A membrane is a mosaic of lipids and proteins.
Q.8.
Assertion : A plant cell bursts if placed in water.
Reason : High turgor pressure causes bursting of plant cells.
Q.9.
Assertion : Mitochondria are called ‘powerhouses’ of the cell.
Reason : Mitochondria produce cellular energy in the form of ATP.
Q.2.
Assertion : The endoplasmic reticulum which lacks ribosomes is called smooth
endoplasmic reticulum
Reason : SER is mainly involved in protein synthesis.
Q.3.
Assertion : Mitochondria and chloroplasts are semiautonomous organelles.
Reason : They are formed by division of pre-existing organelles and contain DNA but
lack protein synthesizing machinery.
Q.4.
Assertion : Plasma membrane is selectively permeable.
Reason : Plasma membrane allows some molecules to pass through it more easily
than others.
Q.5.
Assertion : Leucoplasts perform photosynthesis.
Reason : Chloroplasts store fats, starch and proteins.
Q.6. Assertion : Cell wall is a non-living part of the cell.
Reason : It offers protection, definite shape and support.
Q.7. Assertion : A cell membrane shows fluid behaviour.
Reason : A membrane is a mosaic of lipids and proteins.
Q.8.
Assertion : A plant cell bursts if placed in water.
Reason : High turgor pressure causes bursting of plant cells.
Q.9.
Assertion : Mitochondria are called ‘powerhouses’ of the cell.
Reason : Mitochondria produce cellular energy in the form of ATP.
RAGHUL KRISHNA M B 24 | Science
Q.10.
Assertion : Plant cells have very large vacuoles.
Reason : In plant cells, vacuoles are full of cell sap.
BIOLOGY: CHAPTER-6 TISSUES
DIRECTIONS:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Q.1.
Assertion : Parenchyma cells help in storage of food.
Reason : Parenchyma cells are the main seats of photosynthesis.
Answer:
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
The functions of the parenchymatous tissue is store food material in the form of
starch, proteins, oils and fats. The parenchymatous tissues in root and stem tubers are
good examples. The xylem and phloem parenchyma also store starchy food. The
parenchymatous cells that contain chloroplasts are the main seats of photosynthesis,
e.g., palisade cells of leaf.
Q.2.
Assertion : Vascular or conductive tissue is a distinctive feature of complex plants.
Reason : Vascular tissue has made survival of complex plants possible in terrestrial
environment.
Answer:
ANSWER:
1.(A) 2.(C) 3.(C) 4.(A) 5.(D) 6.(A) 7.(A) 8.(D) 9.(A) 10.(A)
Q.10.
Assertion : Plant cells have very large vacuoles.
Reason : In plant cells, vacuoles are full of cell sap.
BIOLOGY: CHAPTER-6 TISSUES
DIRECTIONS:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Q.1.
Assertion : Parenchyma cells help in storage of food.
Reason : Parenchyma cells are the main seats of photosynthesis.
Answer:
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
The functions of the parenchymatous tissue is store food material in the form of
starch, proteins, oils and fats. The parenchymatous tissues in root and stem tubers are
good examples. The xylem and phloem parenchyma also store starchy food. The
parenchymatous cells that contain chloroplasts are the main seats of photosynthesis,
e.g., palisade cells of leaf.
Q.2.
Assertion : Vascular or conductive tissue is a distinctive feature of complex plants.
Reason : Vascular tissue has made survival of complex plants possible in terrestrial
environment.
Answer:
ANSWER:
1.(A) 2.(C) 3.(C) 4.(A) 5.(D) 6.(A) 7.(A) 8.(D) 9.(A) 10.(A)
RAGHUL KRISHNA M B 25 | Science
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
Xylem and phloem are vascular tissues that conduct water, minerals and food to
various parts of plants. Vascular tissue is a distinctive feature of the complex plants,
one that has made their survival in terrestrial environment possible.
Q.3.
Assertion : The inner lining of intestine has tall epithelial cells.
Reason : Columnar epithelium facilitates absorption and secretion.
Answer:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
Where absorption and secretion occur, such as in the inner lining of the intestine, tall
epithelial cells or columnar epithelium is present. This epithelium facilitates
movement or diffusion across the epithelial barrier.
Q.4.
Assertion : Permanent tissue is composed of mature cells.
Reason : Meristematic tissue is a group of actively dividing cells.
Answer:
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
A meristematic tissue is a group of cells that are in a continuous state of division or
retain their power of division. Permanent tissues are composed of mature cells that,
after undergoing complete growth, have assumed a definite shape, size and function
and have temporarily or permanently lost the power of division.
Q.5. Assertion : Most of plant tissues are dead.
Reason : Due to sedentary existence of plants, dead cells provide mechanical strength
more easily than live ones and need less maintenance.
Answer:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
Q.6.
Assertion : Ciliated epithelium helps in movement of particles.
Reason : Cilia help in movement.
Answer:
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
Xylem and phloem are vascular tissues that conduct water, minerals and food to
various parts of plants. Vascular tissue is a distinctive feature of the complex plants,
one that has made their survival in terrestrial environment possible.
Q.3.
Assertion : The inner lining of intestine has tall epithelial cells.
Reason : Columnar epithelium facilitates absorption and secretion.
Answer:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
Where absorption and secretion occur, such as in the inner lining of the intestine, tall
epithelial cells or columnar epithelium is present. This epithelium facilitates
movement or diffusion across the epithelial barrier.
Q.4.
Assertion : Permanent tissue is composed of mature cells.
Reason : Meristematic tissue is a group of actively dividing cells.
Answer:
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
A meristematic tissue is a group of cells that are in a continuous state of division or
retain their power of division. Permanent tissues are composed of mature cells that,
after undergoing complete growth, have assumed a definite shape, size and function
and have temporarily or permanently lost the power of division.
Q.5. Assertion : Most of plant tissues are dead.
Reason : Due to sedentary existence of plants, dead cells provide mechanical strength
more easily than live ones and need less maintenance.
Answer:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
Q.6.
Assertion : Ciliated epithelium helps in movement of particles.
Reason : Cilia help in movement.
Answer:
RAGHUL KRISHNA M B 26 | Science
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
The function of the cilia is to move particles, free cells or mucus in a specific direction.
It is present in inner surfaces of some hollow organs such as Fallopian tubes,
bronchioles and small bronchi and help in movement of the particles present there.
Thus, the function of ciliated epithelium (as it possesses cilia) is the movement of
particles.
Q.7.
Assertion : Meristematic tissues constitute the major portion of the plant body.
Reason : Meristematic tissues consist of differentiated cells.
Answer:
(d) Both Assertion and Reason are false.
Meristematic tissues, after differentiation, give rise to permanent tissues. These
constitute the major portion of the plant body.
Q.8.
Assertion : Surface of skin is impervious to water.
Reason : Surface of skin is covered by stratified cuboidal epithelium.
Answer:
(c) Assertion is true but reason is false.
Surface of skin is impervious to water because it is covered by stratified keratinized
squamous epithelium. This epithelium has many superficial layers of horny, scale- like
remains of dead squamous cells and several deeper layers of living polygonal cells.
Heavy deposits of the insoluble protein keratin are present in the dead superficial
layers which makes this epithelium impervious to water. Stratified cuboidal
epithelium, on the other hand, lines the inner surface of sweat gland, large salivary
and pancreatic ducts.
Q.9.
Assertion : Lateral meristems add thickness of plants.
Reason : Lateral meristems divide only in one plane.
Answer:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
Lateral meristems are present along the side of the stem. Vascular cambium in the
gymnosperms and the angiosperms is a good example of lateral meristems. Lateral
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
The function of the cilia is to move particles, free cells or mucus in a specific direction.
It is present in inner surfaces of some hollow organs such as Fallopian tubes,
bronchioles and small bronchi and help in movement of the particles present there.
Thus, the function of ciliated epithelium (as it possesses cilia) is the movement of
particles.
Q.7.
Assertion : Meristematic tissues constitute the major portion of the plant body.
Reason : Meristematic tissues consist of differentiated cells.
Answer:
(d) Both Assertion and Reason are false.
Meristematic tissues, after differentiation, give rise to permanent tissues. These
constitute the major portion of the plant body.
Q.8.
Assertion : Surface of skin is impervious to water.
Reason : Surface of skin is covered by stratified cuboidal epithelium.
Answer:
(c) Assertion is true but reason is false.
Surface of skin is impervious to water because it is covered by stratified keratinized
squamous epithelium. This epithelium has many superficial layers of horny, scale- like
remains of dead squamous cells and several deeper layers of living polygonal cells.
Heavy deposits of the insoluble protein keratin are present in the dead superficial
layers which makes this epithelium impervious to water. Stratified cuboidal
epithelium, on the other hand, lines the inner surface of sweat gland, large salivary
and pancreatic ducts.
Q.9.
Assertion : Lateral meristems add thickness of plants.
Reason : Lateral meristems divide only in one plane.
Answer:
(a) Both assertion and reason are true and reason is the correct explanation of
assertion.
Lateral meristems are present along the side of the stem. Vascular cambium in the
gymnosperms and the angiosperms is a good example of lateral meristems. Lateral
RAGHUL KRISHNA M B 27 | Science
meristem is always composed of a single layer of rectangular cells that divide only in
one plane and produce new vascular tissues on either side.
Q.10.
Assertion : Vessel and sieve tube both are meant for transport purposes.
Reason : Vessels are lignified.
Answer:
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
Vessel is a long-distance channel for water transport. Sieve tube is a long-distance
channel for transport of organic nutrients. The wall of vessel is lignified. Lignification
is absent in sieve tubes.
BIOLOGY: CHAPTER-12 IMPROVEMENT IN FOOD RESOURCES
DIRECTIONS:
(a) Both assertion and reason are true, and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true, but reason is not the correct explanation of
assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true.
Q.1.
Assertion: Draught breeds of cows are used mainly as beasts of burden.
Reason: Draught breeds of cow give less milk but are strong and sturdy.
Q.2.
Assertion: Inter cropping prevents pests.
Reason: Plant pests can be controlled biologically by their natural parasites and
pathogens.
meristem is always composed of a single layer of rectangular cells that divide only in
one plane and produce new vascular tissues on either side.
Q.10.
Assertion : Vessel and sieve tube both are meant for transport purposes.
Reason : Vessels are lignified.
Answer:
(b) Both assertion and reason are true but reason is not the correct explanation of
assertion.
Vessel is a long-distance channel for water transport. Sieve tube is a long-distance
channel for transport of organic nutrients. The wall of vessel is lignified. Lignification
is absent in sieve tubes.
BIOLOGY: CHAPTER-12 IMPROVEMENT IN FOOD RESOURCES
DIRECTIONS:
(a) Both assertion and reason are true, and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true, but reason is not the correct explanation of
assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true.
Q.1.
Assertion: Draught breeds of cows are used mainly as beasts of burden.
Reason: Draught breeds of cow give less milk but are strong and sturdy.
Q.2.
Assertion: Inter cropping prevents pests.
Reason: Plant pests can be controlled biologically by their natural parasites and
pathogens.
RAGHUL KRISHNA M B 28 | Science
Q.3.
Assertion: Fumigation of the grains using chemicals is done before storage in
warehouses.
Reason: Fumigation gives a nice colour to the grains.
Q.4.
Assertion: A pulse crop grown in a time interval between two cereal crops
Reason: To compensate for the loss of nitrogen
Q.5.
Assertion: Some weeds produce substances toxic for the crops.
Reason: Weeds take up nutrients and reduce the growth of crops.
Q.6.
Assertion: Cattle are fed with roughage and concentrates.
Reason: Roughage provides fibres while concentrates provide proteins and other
nutrients.
Q.7.
Assertion: Financial status of people should be increased, especially who are involved
in agricultural practices
Reason: Financial status can provide food security.
Q.8.
Assertion: Nitrogen is a micronutrient.
Reason: Micronutrients are nutrients required in small quantity.
Q.9.
Assertion: Manures improve soil conditions.
Reason: In manures, elements are not present in adequate proportions.
Q.10.
Assertion: Vaccinations are given to farm animals.
Reason: Vaccinations protect the farm animals from a number of diseases caused due
Q.3.
Assertion: Fumigation of the grains using chemicals is done before storage in
warehouses.
Reason: Fumigation gives a nice colour to the grains.
Q.4.
Assertion: A pulse crop grown in a time interval between two cereal crops
Reason: To compensate for the loss of nitrogen
Q.5.
Assertion: Some weeds produce substances toxic for the crops.
Reason: Weeds take up nutrients and reduce the growth of crops.
Q.6.
Assertion: Cattle are fed with roughage and concentrates.
Reason: Roughage provides fibres while concentrates provide proteins and other
nutrients.
Q.7.
Assertion: Financial status of people should be increased, especially who are involved
in agricultural practices
Reason: Financial status can provide food security.
Q.8.
Assertion: Nitrogen is a micronutrient.
Reason: Micronutrients are nutrients required in small quantity.
Q.9.
Assertion: Manures improve soil conditions.
Reason: In manures, elements are not present in adequate proportions.
Q.10.
Assertion: Vaccinations are given to farm animals.
Reason: Vaccinations protect the farm animals from a number of diseases caused due
RAGHUL KRISHNA M B 29 | Science
to virus and bacteria
Q.11.
Assertion: Fisheries are important place in Indian economy.
Reason: Fisheries provide income and employment to millions of farmers and
fishermen particularly in coastal states.
Q.12.
Assertion: Legumes increases the soil fertility.
Reason: Microbes in the root nodules of leguminous plants fix atmospheric nitrogen.
Q.13.
Assertion: Presence of weeds affects the crop field.
Reason: Weeds compete for food, space and light.
Q.14.
Assertion: Layers are given more of vitamin A and K.
Reason: Layers are raised for eggs.
Q.15.
Assertion: Crop rotation is the practice of growing two or more varieties of crops in
the same region in sequential seasons.
Reason: Cauliflower and chilli plants grown together in alternating rows are examples
of crop rotation.
ANSWER:
1.(A) 2.(B) 3.(C) 4.(A) 5.(B) 6.(A) 7.(A) 8.(D) 9.(B) 10.(A) 11.(A) 12.(A) 13.(A) 14.(C) 15.(C)
to virus and bacteria
Q.11.
Assertion: Fisheries are important place in Indian economy.
Reason: Fisheries provide income and employment to millions of farmers and
fishermen particularly in coastal states.
Q.12.
Assertion: Legumes increases the soil fertility.
Reason: Microbes in the root nodules of leguminous plants fix atmospheric nitrogen.
Q.13.
Assertion: Presence of weeds affects the crop field.
Reason: Weeds compete for food, space and light.
Q.14.
Assertion: Layers are given more of vitamin A and K.
Reason: Layers are raised for eggs.
Q.15.
Assertion: Crop rotation is the practice of growing two or more varieties of crops in
the same region in sequential seasons.
Reason: Cauliflower and chilli plants grown together in alternating rows are examples
of crop rotation.
ANSWER:
1.(A) 2.(B) 3.(C) 4.(A) 5.(B) 6.(A) 7.(A) 8.(D) 9.(B) 10.(A) 11.(A) 12.(A) 13.(A) 14.(C) 15.(C)
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