4th exam science 9 grade 9 learners (2).pptx

science

1. Republic of the Philippines Department of Education Region XI Schools Division of Davao de Oro Cabidianan , Nabunturan , Davao de Oro FOURTH QUARTER EXAMINATION Science 9

2. Test I. Multiple Choice. Choose the correct answer from the choices given below each item. Write the letter of your choice on the space provided before each number. Write in capital letters. Strictly no erasures or alterations .

3. ______1. A particle moves in a plane with constant acceleration in a direction from the initial velocity. The path of the particle will be ____________. a parabola B. an ellipse C . a straight line D . an arc of a circle

4. ______2. What do you call the path followed by a projectile? follow through B . follow up C . tracer D . trajectory

5. _____ 3. If you throw a baseball straight up, what is its vertical velocity at the highest point? A.0 m/s 9.8 m/s C . 0m/s 2 D .-9.8 m/s 2 .

6. ______4. If a stone is horizontally launched at a certain height, how do you describe the magnitude of its vertical velocity as it approaches the ground ? A. Changes continuously B . Gradually decreasing C. Gradually increasing D . Remains the same

7. ______5. When a horizontal force equal to its weight is applied to an object on a frictionless surface, what is its acceleration? A. acceleration due to gravity B. acceleration due to force acceleration due to surface D . acceleration due to friction

8. ______6. Vertical motion is a type of motion that is affected by gravity. Which of the following satisfies an object moving in vertical motion? Book on top of a table B . Chandelier suspended in a ceiling C. Ball on the fifth floor of a building D . Fruit falling from a tree

9. ______7. Two objects are released from the same height. Object A falls straight down from the cliff, and object B follows a curved parabolic path. Which of the statement is true?   A. Object A hits the ground before Object B. B. Object B hits the ground before Object A. C. Object A hits the ground first if it is heavier than Object B. D. Both Object A and Object B will hit the ground at the same time.

10. ______8. A projectile is launched at an angle of 300 above the horizontal. Neglecting air resistance, what are the projectile’s horizontal and vertical accelerations when it reaches its maximum height? A. Both the horizontal and vertical accelerations are zero. B. Both the horizontal and vertical accelerations are 9.81 m/s2. C. The horizontal acceleration is 9.81 m/s2 and the vertical acceleration is zero. D . The horizontal acceleration is zero and the vertical acceleration is -9.81 m/s2.

11. ______ 9. What factor(s) affect(s) how far a projectile will land? A . Angle of launch B. Initial velocity C. Both A and B D. None of the choices

12. ______10. Consider a plane moving with a constant speed at an elevated height above the Earth's surface. During its flight, the plane drops a package from its luggage compartment. Where will the luggage land with respect to the plane? A. Behind the plane B . Directly below the plane C. In front of the plane D . None of the choices

13. ______11. A person throws a ball straight up into the air. If the ball is on the way up, then the force on the ball is shown by which arrow? B

14. ______12. A baseball player throws a ball horizontally (at an angle of 0 ). Which statement best describes the ball’s motion after it is thrown? (Neglect air resistance) A. Its vertical speed increases and its horizontal speed decreases. B. Its vertical speed increases, and its horizontal speed increases. C. Its vertical speed increases, and its horizontal speed remains the same. D. Its vertical speed remains the same, and its horizontal speed remains the same.

15. ______12. A baseball player throws a ball horizontally (at an angle of 0 ). Which statement best describes the ball’s motion after it is thrown? (Neglect air resistance) A. Its vertical speed increases and its horizontal speed decreases. B. Its vertical speed increases, and its horizontal speed increases. C. Its vertical speed increases, and its horizontal speed remains the same. D. Its vertical speed remains the same, and its horizontal speed remains the same.

16. ______13. Which has more momentum, a heavy truck moving at 30 kph or a light truck moving at 30 kph ? heavy truck B. light truck C. both have the same momentum D. cannot be determined

17. ______14. Two billiard balls approach each other at equal speed. If they collide in a perfectly elastic collision, what would be their velocities after collision? A . zero B. same in magnitude and direction C. same in magnitude but opposite in direction D. different in magnitude and opposite in direction

18. ______15. Which of the following statements describes momentum? A . It is the sum of body’s mass and velocity. B . It is the product of body’s mass and velocity. C . It is the sum of body’s mass and acceleration. D . It is the product of body’s mass and acceleration.

19. ______16. Two marbles of equal mass are rolling towards each other. One is rolling at 7 m/sec and the other at 10 m/sec. The one rolling faster has a________ momentum and________ impulse. It will surely knock the other one backwards. A . greater, greater B . greater, lesser C . lesser, greater D . lesser, lesser

20. For items 17 and 18 Refer to the figure below. Suppose that two cars with equal masses collide with each other. Car A travels faster than Car B. They both stopped after collision. ______ 17. Which of the two cars has the lesser change of velocity? A. Car A B. Car B C. Both Car A and Car B D. None of the choices ______ 18. Which car has the greater change in momentum? Car A B. Car B C. Both Car A and Car B D. None of the choices

21. ______19. What word can best describe the total momentum in an isolated system? A . changed B. conserved C . converted D . lost ______ 20. Two marbles with a total mass of 20 kg has an initial momentum of 100 kg m/s. If the marbles stick together after the collision, what is the final velocity of the marbles? A. 5 m/s B . 80 m/s C . 120 m/s D . 2, 000 m/s

22. ______21. What is the momentum of the two cars after collision if its momentum before collision is 50 kg m/s? 5 kgm /s B . 15 kgm /s C . 30 kgm /s D . 50 kgm /s

23. ______21.What is the momentum of the two cars after collision if its momentum before collision is 50 kg m/s ? A . 5 kgm /s B . 15 kgm /s C . 30 kgm /s D . 50 kgm /s

24. ______22. A car collided with a bus that has greater mass and velocity than the car. Which of these describes the change of momentum of the bus and the car? A. The change of momentum of the car and the bus is zero. B. The change of momentum of the car and the bus is the same. C. The change of momentum of the bus is less than that of the car. D. The change of momentum of the bus is greater than that of the car.

25. ______23. What to do to reduce your electric bill? Connect appliances in series. B. Make use of limited appliances. C. Put off appliances when not in use. D. Put off the main switch during the day. ______ 24. The total mechanical energy of the object at the highest point compared to its total mechanical energy at the lowest point is _______________. equal . C. lesser. B . greater. D . not related.

26. ______ 25. Mechanical energy is defined as the sum of both the potential energy and the kinetic energy of an object. According to the law of conservation of energy, what happens to mechanical energy if the potential energy of an object decreases? A . Mechanical energy increases. B. Mechanical energy decreases. C. Mechanical energy remains unchanged. D. Mechanical energy increases then decreases.

27. ______26. Which of the following are two types of Mechanical Energy? Kinetic and Nuclear Energy Kinetic and Potential Energy C. Potential and Chemical Energy D . Thermal and Kinetic Energy

28.   For numbers 27-28, A pendulum is hanging from a point and its total mechanical energy is constant. Refer to the figure below . ______27. At which point in the pendulum’s motion where the kinetic energy is at its maximum A. b B. c C. d D. e ______28. At which point of the pendulum’s motion is the value of the change in the potential energy equal to the change in the kinetic energy? A. a B. b C. c D. e

29. ______29. Heat is added in our body by metabolizing food, and our body does work in breathing , walking, and other activities. If we return in the same state at the end of the day, how will you describe the work and heat of our body? A. The amount of heat is equal to the work done B. Internal energy is zero. C. Both A and B. D. Work done is greater than the heat added.

30. ______30. What happens to internal energy when both heat transfer (Q) and work done (W) are equal? A. The internal energy remains the same. B. The internal energy has no net charge. is not affected. C. The internal energy is equal to the sum of heat and work. (decreases) D. The internal energy is equal to the difference of heat and work. (Increases)

31. ______31. Which of the following is an example of work converted into heat? Gas stove C. Hand rubbing B . Heat engine D . Hot air balloon ______ 32. How does heat and work affect a system? A. Heat and work affects the system in a negligible impact. B. Heat and work do not affect to the total internal energy of a system. C. Without heat and work, there will be no internal energy of the system. D. Heat and work both contribute to the total internal energy of a system.

32. ______33. What happens to the molecules in the balloons when heated? A. molecules collide into the balloon with more energy B. molecules collide into the balloon with less energy C. molecules freeze into the balloon with less energy D. molecules freeze into the balloon with no energy ______ 34. When the work is done upon the object, that object gains energy. What type of energy is acquired by the objects upon which work is done? Electrical energy C. Mechanical energy B . Heat energy D . Work energy

33. ______ 35. This flashlight uses three different forms of energy. Which of these shows the energy changes in the correct order?   Mechanical → thermal → chemical Chemical → electrical → electromagnetic C . Thermal → chemical →electromagnetic Chemical→ electrical→ mechanical→ chemical

34. ______36. In the Agus VI Hydroelectric Power Plant, which energy transformation takes place? A.Electrical  mechanical  electrical B. Gravitational potential energy  kinetic energy  electric energy C. Heat energy  mechanical energy  electrical energy D. Nuclear  heat  electrical

35. ______37. Heat transfers in heat engines just like in a Geothermal Plants from _________, A . from/to reservoirs of the same temperature. B. from cold to hot reservoirs. C. from hot to cold reservoirs. D. cannot be predicted.

36. ______38. When the work is done upon the object, that object gains energy. What type of energy is acquired by the objects upon which work is done? Electrical energy B . Heat energy C. Mechanical energy D . Work energy

37. ______ 39. Which of the following will INCREASE the current from a solar panel? A. Using a lead acid cell in series with the solar cells. B. Using a wet cell in series with the solar cells. C. Connecting the solar cells in series. D. Connecting the solar cells in parallel .

38. ______40. All of the following power plants uses steam to drive the turbines to produce electricity except _________. A . coal-fired. B . geothermal. C . hydropower. D . nuclear.

39. ______41. Which of the following is the correct sequence in the process of generating electrical energy in power plants? A. turbine  source  generator  electrical energy B . source  turbine  generator  electrical energy C . turbine  source  generator  electrical energy D . source  generator  turbine  electrical energy

40. ______42. Which of the following power plant is the most reliable in generating electricity? A.Hydropower plant C. Steam Power Plant B. Nuclear Power Plant D . Wind Power Plant ______ 43. During which stage of providing electricity to consumers is a pole transformer used? A. generation of electricity B. distribution of individual consumers C. transmission from power plant to substation D. transmission from substation to local distribution

41. ______44. Which of the following are advantages of hydro-electric power stations over coal power stations? A. Cheaper running costs with pollution effects  B. More expensive to operate with no pollution effects. C. Use of renewable energy sources and pollution free.  D. Use of non-renewable energy sources and pollution free.

42. ______45. What is the correct order of transmission and distribution of electrical energy to consumers? 1. Distribution Substation 2. Power Plant 3. Transmission Station 4. Consumers A. 1 2 3 4 B . 2 3 1 4 C . 3 2 1 4 D. 4 3 2 1  

43. Test II. CRITICAL THINKING. Carefully read and study the following situations and answer the questions.

44. 46-49. Take a look at the illustration of the before and after collision between the cue ball and Ball #8. Answer the following guide questions . Which ball has a lesser change in momentum? _______________________________________ 47. Which ball has a greater impulse? ____________________________________________________ 48. Is there a change in momentum of the cue ball? Why? _______________________________________   ____________________________________________________________________________ 49. When there is impulse, explain why there is a change in momentum of the Ball #8?   __________________________________________________________________________________   _________________________________________________________________________________________________  

45. 50-52. (3 points)  In other countries, many homes generate electricity from windmills. In a particular home, a young boy is using the electricity to run a toy electric train. Make an energy flow chart that shows how the energy changes from one form to another. Answer :  

46. 53-54. (2 pts) A  basketball is thrown upwards on an arc at a 60 degree angle with the horizontal. If the  velocity of the ball is 5 m/s, how fast must the thrower run  to catch the ball after it is released ? Answer:

47. 55-57. (3 pts) Assume that the height at points 1 & 3 are the same. Refer to the figure below.

48. 55. In which points the kinetic energy is being converted into potential energy? Answer: 56. In which points the potential energy is being converted into kinetic energy? Answer: 57. Describe the total energy of the car, as it moves from point 1, to point 2, and finally to point 3. Answer:  

49. 58-60. Fill in the boxes with the following energy transformations that takes place in a geothermal power plant by placing the terms below. ( 3 pts ) • Electrical Energy • Kinetic Energy of steam rotating turbine • Thermal Energy from earth’s interior