Class 10 Cbse Science Question Paper Term 2

Cbse class 10 science question paper term 2 - http://cbse.edurite.com/cbse-question-papers/cbse-question-papers-for-class-10.html

1. Series BRH as 31/1
Code No.
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Roll No. aaa fre |

Candidates must write the Code on
the title page of the answer-book.

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© aya ate a a fe meh wee

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aaa wet fe 15 fire a fa da fen qe à
10.15 3% fea AMET | 10.15 34 à 10.30 78 a wm Fae aan at UBT sik
a safe à dhe à Tr a at feat 1

+ Please check that this question paper contains 19 printed pages.

+ Code number given on the right hand side of the question paper should be
written on the title page of the answer-book by the candidate.

+ Please check that this question paper contains 41 questions.

+ Please write down the Serial Number of the question before
attempting it.

+ 15 minutes time has been allotted to read this question paper. The question
paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the
students will read the question paper only and will not write any answer
on the answer-book during this period.

mofa wlan - 11
SUMMATIVE ASSESSMENT - II

fers

SCIENCE
Prater aoa: 3 me cea Se : 80
Time allowed : 3 hours Maximum Marks : 80

31/1 1 P.T.O.

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General Instructions :

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‘The question paper comprises of two sections, A and B. You are to
attempt both the sections.

All questions are compulsory.

There is no overall choice. However, internal choice has been
provided in all the three questions of five marks category. Only one
option in such questions is to be attempted.

All questions of Section A and all questions of Section B are to be
‘attempted separately.

Questions number 1 to 4 in Section A are one-mark questions.
These are to be answered in one word or one sentence.

Questions number 5 to 13 in Section A are two-mark questions.
These are to be answered in about 30 words each.

Questions number 14 to 22 in Section A are three-mark questions.
These are to be answered in about 50 words each.

Questions number 23 to 25 in Section A are five-mark questions.
These are to be answered in about 70 words each.

Questions number 26 to 41 in Section B are multiple choice
questions based on practical skills. Each question is a one-mark
question. You are to select one most appropriate response out of the
four provided to you.

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6.

31/1

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SECTION A

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2

Write the name and formula of the second member of the carbon
compounds having functional group - OH,

A anh ar sata A |

State one function of iris in human eye.

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Fat?

What happens when higher energy ultraviolet radiations act on the
oxygen at the higher level of the atmosphere ?

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os qe sien a errata O fe feed sal sae dr 7
In a food chain, if 10,000 joules of energy is available to the producer, how
much energy will be available to the secondary consumer to transfer it to
the tertiary consumer ?

AN ye ae Ru me:

©, 50, yNe, Na, „Si
De |
Gi) HSA ae ghee ww aR À en eg
ete or Hamad a fare are a ı
Choose from the following :

©, 50, ¡oNe, „Na, Si
(i) Elements that should be in the same period.

(i) Elements that should be in the same group.
State reason for your selection in each case.

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ae Fs, (i) A er fee | at see a en ale Ye ae |
An element X’ belongs to 3™ period and group 17 of the periodic
table. State its (i) electronic configuration, (ji) valeney. Justify your
answer with reasoning.

2

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a a q ee om à A (sige) a gfe wa À es FI
Name an organism which reproduces by spore formation. List three
conditions favourable for spores to germinate and grow.

U Per fre ar acter are |

State the role of placenta in the development of embryo.

ver fart ate a a warm Ada fect a
er gu war fear À fe cio RA fem are BOT HU
tos
33 fer da ara ma ade A sar amet xB ate fae A
Sea a feats ara AA à

To construct ray diagram we use two light rays which are so chosen
that it is easy to know their directions after reflection from. the
mirror. List these two rays and state the path of these rays after
reflection. Use these rays to locate the image of an object placed
between centre of curvature and focus of a concave mirror.

Fe aia & fos A Ar Per A
3 fem mita fr ante aan |

Draw a labelled ray diagram to illustrate the dispersion of a narrow beam
of white light when it passes through a glass prism.

rarer 3 ara ot as ff à gw sre (Sia O we Rot ame
site St a A eer ae |

A star appears slightly higher (above) than its actual position in the sky.
Mlustrate it with the help of a labelled diagram.

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WE!

List three problems which
Suggest a solution for these problems.

Se er à ar aed gh wae |
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List the products of combustion of fossil fue!s hat are their adverse
effects on the environment ?

A a a ae ee

due to construction of big dams.

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crema q ff ae Su arm am A 6 fie pm,
Gi) Tabs qu, Fe we À 1 3
What is meant by homologous series of organic compounds ? Write
the chemical formulae of two members of a homologous series and
state which part dotermines the (5 physical properties, (ii) chemical
properties, of these compounds.

16. Na, Mg ma AI à act fot ites a dou wee Um, à ao ae

81 6) feed very Fa dá?
SR fing are Rae ad see a Ge a ı 3

Na, Mg and Al are the elements having one, two and three valence
electrons respectively. Which of these elements (i) has the largest
atomic radius, (ii) is least reactive ? Justify your answer stating
reason for each,

16. mid at as fit q te ze ee af 3

List and explain in brief three methods of contraception,

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EEE ew a Bae A oe A ow aR
Fy 3 me ce en ed AAA ee Ga
wm
O FAN RRA
CF AA ek ee ur er?

(0 am mom & A E of 3 oe RA,

AE & fer armen Sz | 3
If we cross pure-bred tall (dominant) pea plant with pure-bred dwart
(recessive) pea plant we will get pea plants of F, generation. If we
now selfcross the pea plant of F, generation, then we obtain p
plants of F, generation.

(a) What do the plants of F generation look like ?
(b) State the ratio of tall plants to dwarf plants in F generation,

(©) State the type of plants not found in F generation but appeared
in Fy generation, mentioning the reason for the same.

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19.

21.

31/1

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arr aR es UU ee A |
List in tabular form two distinguishing features between acquired traits
and inherited traits, with one example of each.

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ar a 1

How are fossils formed ? Describe, in brief, two methods of determining
the age of fossils.

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ain à sant a sede aif | wate SE aK at Ye à fe mn
Fer 1

State the types of mirrors used for (i) headlights and (ii) rear view mirrors,
in cars and motorcycles. Give reason to justify your answer in each case.

4 cm wen aE fret 24 cm wae gi sea Ge à yon ses aera feast
faa at An À GA 16 em À à Se ar an sein a A fee,
a a AA |

A 4 cm tall object is placed perpendicular to the principal axis of a convex
lens of focal length 24 cm. The distance of the object from the lens is
16 em. Find the position, size and nature of the image formed, using the
lens formula.

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Ua Fee ae Gy à fen À AS
@ We ay sik eas (i) A fee fae ate fat ı

An old man cannot see objects closer than 1 m from the eye clearly.
Name the defect of vision he is suffering from. How can it be
corrected ? Draw ray diagram for the (i) defect of vision and also
Gi) for its correction.

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fear aa see A at deem A Ten | feet orig

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What are hydrocarbons ? Write the name and general formula of
G) saturated hydrocarbons, (ji) unsaturated hydrocarbons, and draw
the structure of one hydrocarbon of each type. How can an
unsaturated hydrocarbon be made saturated ?
OR

What are detergents chemically ? List two merits and two demerits of
using detergents for cleansing. State the reason for the suitability of
detergents for washing, even in the case of water having calcium and
‘magnesium ions.

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6

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[DE mo owe Ew fies of

Gil) ae arm ae Prüfen re (ger) eat Gat & |
wma freenet?

Distinguish between unisexual and bisexual flowers giving one
example of each. Draw a diagram showing process of germination of
pollen grains on stigma and label the following parts :

® Female germ cell
Gi) Male germ cell

Gi

i) Ovary
OR

7 P.T.O.

8. 25.

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Draw a diagram of human female reproductive system and label the
part

(that produces eggs.

Gi where fusion of egg and sperm takes place.

(ii) where zygote is implanted.

What happens to human egg when it is not fertilised ?

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3 era à faq Fa à Fam en ate are aa sa ona eT oe
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ar aia À vara at art 2 x 10% m/s @, À (a) ay 0) we À, are
a are A |

List the new Cartesian sign convention for reflection of light by
spherical mirrors. Draw a diagram and apply these conventions for
calculating the focal length and nature of a spherical mirror which
forms a 1/3 times magnified virtual image of an object placed 18 cm
in front of it.

OR

With the help of a ray diagram, state what is meant by refraction of
light. State Snell's law for refraction of light and also express it
mathematically.

‘The refractive index of air with respect to glass is 2/3 and the refractive
index of water with respect to air is 4/3. If the speed of light in glass is
2 x 10° m/s, find the speed of light in (a) air, (b) water.

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SECTION B
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A) Fake
MO Bak ine
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‘The aqueous solutions of copper sulphate and zine sulphate appear
(A) blue and green respectively

(B) green and colourless respectively.

(©) blue and brown respectively:

(D) blue and colourless respectively

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3 11 afer frm ar ı cts Per gw Zah RG à AT | SO aT
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(© mate 18

D) #4

Solutions of copper sulphate, iron sulphate and zine sulphate are
prepared and marked I, II and III respectively. Fow pieces of aluminium
are added to each solution. After some time a change will be observed in
(A) Land TT

(B) Wand I

(© Hand!

(D) All the three

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edüfte ve

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(©) dy om

(D) ag trees mi sheer Ae fra à

On adding 2 mL acetic acid to 2 mL of water in a test tube, it was
observed that

(A) a clear and transparent solution is formed
(B) a white precipitate is formed almost immediately
(©) two separate layers were formed

(D) a colourless and odourless gas is evolved

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ae

(A) a aa at

O) en te ot ings te Free À
(©) tata fe stata te aa aE
(D) fare a chen ie om À

On adding acetic acid to sodium hydrogen carbonate in a test tube, a
student observes

(A) no reaction
(B) a colourless gas with pungent smell
(©) bubbles of a colourless and odourless gas

(D) a strong smell of vinegar

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(A) ae A ES
ES EEES

(0) ae ee Fee 8 em ar dm À of eu Fr vit om à

CD) ae we eme An an ten À of eu Get a vie ae

Which one of the following are the correct observations about acetic
acid ?

(A) It turns blue litmus red and smells like vinegar
(B) It turns blue litmus red and smells like burning sulphur
(©) It turns red litmus blue and smells like vinegar

(D) It turns red litmus blue and has a fruity smell

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sive z fruits sch 1 tory ara aS & fe a safes ser fee

(a) Se ger a fact a ae
O BE see weer qa pra
O wad we a faye ETS

O) a st te à qe feat eat aa

A student has to determine the focal length of a concave mirror by
obtaining the image of a distant object on a screen. For getting best
result he should focus

(A) a distant tree or an electric pole

(B) a wellilluminated distant building

(©) well-lit grills of the nearest window

(D) a burning candle placed at the distant edge of the laboratory
table

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(A) er da Ge sees re lao
CB) À gy an da Ct safe wees
E 202 wife we 2,23

(D) Aca wher a seer ee

A student obtained a sharp inverted image of a distant tree on a
screen placed in front of the concave mirror, He then removed the
screen and tried to look into the mirror. He would now see

(A) a very blurred image on the wall opposite to the mirror
(B) an erect and magnified image of the tree in the mirror
(©) no image as the screen has been removed

(D) a highly diminished inverted image of the tree at the focus of the

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(A) & aa aa ak we
® wae tsk aaa e
© aaa dee, ta des oh vs tor
O war ts, w eg, wots Soe oh ue Sur
If you are to determine the focal length of a convex lens, you should have
(A) a convex lens and a sereen
(B) a convex lens and a lens holder
(©) a lens holder, a screen holder and a scale

(D) a convex lens, a screen, holders for them and a scale

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a Per ERT cng Ef a #1 1
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= e
‘oP Pe
1 u um v
wi
ou
© m
© w

While performing the experiment on tracing the path of a ray of light
‘through a rectangular glass slab, in which of the following experimental
set-ups is a student likely to get best results ?

P, and P, are the positions of pins fixed by him.

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‘oP ap, ‘Pe
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wr
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mv

Four students showed the following traces of the path of a ray of light
passing through a rectangular glass slab.

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‘The trace most likely to be correct is that of student
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Following diagrams were drawn by different students on having seen
prepared slides of budding in yeast.

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Correct diagrams are

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In which of the following figures is budding not shown ?

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(A) MM, IV, 1
@ MI II
© MUT

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‘The following figures illustrate binary fission in Amoeba in an incorrect
sequence.

‘The correct sequence is
(A) MM, IV,1
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© M,M,IV,1
D 1,1, 0,1

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1 u u Vv v
(A) LILI (8) IV, 0, 0
© vom ) 1,1, 10

From the following diagrams, select the correct ones showing stages
of binary fission in Amoeba

@ e
(A) 1,0, 01 (B) IV, HU, IN

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® x 100

o Zi D) (4-2) x 100

A student weighed some raisins and recorded the weight as ‘x. She
then soaked the raisins in distilled water. After about 2 hours she
removed the raisins, wiped them dry and weighed again and recorded
that as “y. The percentage of water absorbed by raisins may be
determined using the relationship

a m2 x 100

© D) (yx) x 100

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CORTE

In the experiment for determining the percentage of water absorbed
by raisins, we do the final weighing of the raisins after keeping them
dipped in water for about one hour. For the accuracy of the result,
the extra water from the surface of the soaked raisins is removed by

(A) rubbing with cotton cloth
(8) hot air blower

(©) dry cotton wool

(D) filter paper

an 19