CBSE Class 10 Science Sample Paper Set H

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SCIENCE Class – X

Time Allowed : 3 hours Maximum Marks : 90

General Instructions : 1. The question paper comprises of two Sections, A and B. You are to attempt both the

sections. 2. All questions are compulsory 3. All questions of Section-A and all questions of Section-B are to be attempted separately. 4. Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in

one word or in one sentence 5. Question numbers 4 to 6 in Sections-A are two marks questions. These are to be answered

in about 30 words each. 6. Question numbers 7 to 18 in Section-A are three marks questions. These are to be

answered in about 50 words each 7. Question numbers 19 to 24 in Section-A are five marks questions. These are to be

answered in about 70 words each. 8. Question numbers 25 to 33 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.

9. Question numbers 34 to 36 in Section-B are questions based on practical skills are two marks questions.

SECTION-A 1 Name the process used by single-celled organisms for taking in food, exchange of gases or

removal of wastes.

1

2 Write the SI unit of Resistance. 1

3 What is a solar panel ? 1

4 A student performed the following reactions :

(i) CuSO4 + Fe → FeSO4 + Cu

(ii) FeSO4 + Zn → ZnSO4 + Fe

(ii i) 2AgNO3 + Cu → Cu (NO3)2 + 2Ag

State the conclusions drawn from each of the above reaction and hence arrange Cu, Fe, Ag and

Zn in the decreasing order of their reactivity.

2

5 Write a chemical equation to describe how baking soda is produced on a large scale. Also

write chemical name of the products obtained.

2

6 Write two differences between the response of the plants and response of the animals to

stimuli.

2

7 Write chemical equations for the following reactions :

(i) a piece of calcium metal is dropped in water.

(ii) steam is passed over red hot iron.

(iii) Zinc sulphide is heated in air.

3

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8 State reason for the following :

(i) dry HCl gas does not change the colour of the dry blue litmus paper.

(ii) alcohol and glucose also contain hydrogen, but do not conduct electricity.

(iii) Conc. of H3O+ ion is affected when a solution of an acid is diluted.

3

9 (a) In the following reactions name the reactants which undergo oxidation and which undergo

reduction :

(i) CuO(s)

+H2(g) →Cu

(s)+H

2O

(g)

(ii) CuO(s)

+Zn(s)

→ZnO(s)

+Cu

(b) State one industrial application of reduction.

3

10 State reason for the following :

(i) Potato chips manufacturers usually flush bags of chips with nitrogen gas.

(ii) Iron articles loose their shine gradually.

(iii) Food should be kept in air tight containers.

3

11 (a) An old man is advised by his doctor to take less sugar in his diet. Name the disease

from which the man is suffering. Mention the hormone due to imbalance of which he is

suffering from this disease. Which endocrine gland secretes this hormone ?

(b) Name the endocrine gland which secretes growth hormone. What will be its effect on a

person of :

(i) Deficiency of growth hormone.

(ii) Excess secretion of growth hormone.

3

12 Draw a neat diagram of human alimentary canal and label pancreas and liver on it. 3

13 Explain the mechanism of reflex action. 3

14 What is meant by Electromagnetic Induction ? Describe an activity to demonstrate the

phenomenon.

3

15 One of the major causes of fire in office buildings is short circuiting. List three factors which

may lead to short circuiting.

3

16 A circuit has a line of 5 A. How many lamps of rating 40 W; 220 V can simultaneously run on

this line safely?

3

17 There are about fifty teachers in a school and most of them come to school by their own cars.

Many of the teachers come from the same place but everyone prefers to come to school by

his/her own car.

Answer the following questions based on above information :

(i) Do you think that their practice of commuting to school is environmental friendly ?

Give one suggestion. Justify your answer.

(ii) In what other two ways we can become environmental friendly ?

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18 Write any three characteristics of a good fuel. 3

19 Give suitable reasons for the following statements :

(i) Rain water conducts electricity but distilled water does not.

(ii) We feel burning sensation in the stomach when we overeat.

(iii) A tarnished copper vessel regains its shine when rubbed with lemon.

(iv) During summer reason, a milkman usually adds a very small amount of baking soda to

fresh milk.

(v) An aqueous solution of sodium chloride is neutral but an aqueous solution of sodium

carbonate is basic.

5

20 (a) When calcium metal is added to water, the gas evolved does not catch fire but the same

gas evolved on adding potassium metal to water catches fire. Explain why ?

(b) Name a metal for each case :

(i) It displaces hydrogen gas from nitric acid.

(ii) It does not react with any physical state of water.

(iii) It does not react with cold as well as hot water but reacts with steam.

5

21 (a) State the form in which the following are stored :

(i) Unused carbohydrates in plants

(ii) The energy derived from food in humans

(b) Describe the process of nutrition in amoeba with the help of diagram.

5

22 Describe with the help of a labelled diagram an activity to demonstrate the force acting on a

current-carrying conductor due to a magnetic field. Also show the effect of change in direction

of magnetic field and change in direction of current. State the rule to find the direction of force

based on the conclusion of this activity.

5

23 State the factors on which the resistance of a metallic wire depends. Define the term resistivity

and derive its SI unit.

A wire of length 1 metre and radius 0.02 cm has a resistance of 5.0 ohms. Calculate the

resistivity of the material of the wire.

5

24 (a) What is an electromagnet ? What does it consist of ?

(b) With the help of a diagram showing experimental arrangement describe an activity to

show how an electromagnet can be made in a school laboratory.

(c) Compare the pattern of the field produced in case of a current carrying solenoid with

the magnetic field of a bar magnet.

5

SECTION - B

25 A base can be tested by : (a) blue litmus (b) red litmus (c) blue or red litmus (d) lime water

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26 Suggest the solution which you would choose for testing pH of given sample :

(a) Blue litmus (b) Red litmus

(c) Universal indicator solution (d) Lime water

1

27 Hydrated ferrous sulphate is commonly known as :

(a) Blue vitriol (b) Green vitriol

(c) Yellow vitriol (d) Brown vitriol

1

28 Solutions of ZnSO4, CuSO4 and Al2(SO4)3 were separately taken in three different test tubes

and iron filings were added to each.

After the above sets were allowed to stand for an hour, a coating on iron filings was observed

in :

(a) II and III (b) III only

(c) I and II (d) II only

1

29 Anushri dissolved crystals of copper sulphate in water, the colour of solution will be –

(a) Blue (b) Green (c) Yellow (d) Colourless

1

30 In our domestic electric circuit the component which is always connected in series is : (a) Fuse wire (b) Earth wire (c) Live wire (d) Connecting wire

1

31 Teacher give the circuit diagram to find resistance of a parallel combination of two resistance

as follows.

A student is finding it difficult to identify the devices marked as X, Y, and Z correct

identification of X,Y,Z respectively is :

(a) ammeter, voltmeter,resistance

(b) rheostate, ammeter, voltmeter

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(c) voltmeter, ammeter, rheostate

(d) ammeter, rheostate, voltmeter

32 On completion of the experiment to demonstrate that “light is necessary for photosynthesis”, four students reported the inference as follows. Identify the correct inference.

(a) Part of the leaf covered with strip can only undergo photosynthesis

(b) Uncovered parts of the leaf cannot synthesize starch

(c) Photosynthesis takes place only in the presence of sunlight

(d) Light is necessary for synthesis of starch in green plants

1

33 In an experimental set – up to demonstrate that CO2 is released during respiration, Vaseline is

applied to :

(a) fix the rubber stopper at the mouth of the flask

(b) the mouth of the U-shaped tube

(c) the germinating seeds

(d) the rubber stopper where the delivery tube enters and the mouth of the flask

1

34 Iron filings were added to an aqueous solution of copper sulphate. After ten minutes, it was observed that the blue colour of the solution has changed and there is a coat on the iron filings. State the change in colour observed in the solution and also colour of the coat formed on the iron filings.

2

35 Calculate the resistance of a resistor on the basis of readings shown.

2

36 In the experiment to prepare temporary mount of leaf peel, which stain is preferred and how is

extra stain on the slide removed ?

2

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Marking Scheme

Science (Class–X)

General Instructions:

1. The Marking Scheme provides general guidelines to reduce subjectivity and maintain uniformity.

The answers given in the marking scheme are the best suggested answers.

2. Marking be done as per the instructions provided in the marking scheme. (It should not be done

according to one’s own interpretation or any other consideration).

3. Alternative methods be accepted. Proportional marks be awarded.

4. If a question is attempted twice and the candidate has not crossed any answer, only first attempt be

evaluated and ‘EXTRA’ be written with the second attempt.

5. In case where no answers are given or answers are found wrong in this Marking Scheme,

correct answers may be found and used for valuation purpose.

SECTION-A

1 1

2 ohm

1

3 A large no. of solar cells combined in an arrangement that can deliver energy, electricity for

practical use.

1

4 Iron is more reactive than copper, zinc is more reactive than iron, copper is more reactive than

silver.

So, Zn > Fe > Cu > Ag

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5

NaCl H2O CO2 NH3 4 3N H C l N a H C O

A m m o n iu m S o d iu m h y d ro g e n

C h lo r id e c a rb o n a te

2

6 Plants Animal

(i) No specific or

specialized tissue

present for conduction

of information

Specialised tissues are

present in the body for

conduction of

information

(ii) Plant cells change

shape by changing the

amount of water in

them

Specialised proteins

found in muscle cells

that help in changing

shape

2

7

(i) (a q ) g(s ) 2 ( ) 2 2C a 2 H O C a (O H ) H

C a lc iu m W a te r (c o ld ) C a lc iu m H y d ro g e n

h y d ro x id e

l

(ii) (s ) (g )(s ) 2 (g ) 3 4 23 F e 4 H O F e O 4 H

Iro n S te a m I ro n I I , I I I o x id e H y d ro g e n

(iii) (g ) (g )(s ) 2 (s ) 22 Z n S 3 O 2 Z n O 2 S O

Z in c su lp h id e o x y g e n Z in c o x id e S u l p h u r d io x id e

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8 (i) Dry HCl gas does not contain any hydrogen ions, when hydrogen chloride gas dissolves in

water it forms H+ ions, and conduct electricity.

(ii) Alcohol and glucose when dissolved in water do not dissociate into H+ ions, so do not conduct

electricity.

(iii) On dilution acid dissociates more to produce more H+ ions.

3

9 (a) (i) CuO is reduced to copper

Hydrogen is oxidised to water

(ii) CuO is reduced to copper

Zinc is oxidised to zinc oxide

(b) To obtain pure metals from their ores by electrolytic reduction. E.g Sodium, aluminium.

3

10 (i) To prevent the potato chips from becoming rancid.

(ii) Due to corrosion of metal.

(iii) To present oxidation.

3

11 (a) Diabetes, insulin, pancreas

(b) Pituitary gland, Dwarfism, gigantism

3

12 Fig. 6.6 Page 92 correct Labellings.

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13 (1) Receptor organs like skin receives the stimulus and activates a sensory nerve impulse.

(2) Sensory impulse to spinal cord.

(3) The neurons of spinal cord transmit the sensory nerve impulse to motor neuron.

(4) Motor nerve conducts these impulses to the effectors like muscles which respond

accordingly.

3

14 Electromagnetic induction.

Activity

3

15 Wearing of insulation in old load wires. Using fuse of higher rating. Over loading.

3

16 np VI

n V I

p

2 2 0 5

4 0

1 1 0

427.5

27 lamps

3

17 (i) No, car pooling

(ii) By using alternative sources of energy like solar cell panel, wind mill etc.

Students are promoting environmental concern, sharing, helpfulness.

(any two)

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18 • Amount of heat released on burning

• easy availability

• easy to store and transport

• does not produce smoke.

Any three

3

19 (i) Distilled water does not conduct electricity because it does not contain any ionic

compound like acids, bases or salts dissolved in it.

(ii) When we overeat excess of acid is produced in the stomach which causes burning

sensation.

(iii) Copper vessels tarnish due to formation of basic copper carbonate. Which gets

neutralized when rubbed with lemon and the copper vessel regains its shine.

(iv) Washing soda is sodium carbonate decahydrate which when exposed to air loses 10

molecules of water and changes to white powder.

(v) Sodium chloride is a salt of strong acid HCl and strong base NaOH so it is neutral.

Sodium carbonate is a salt of weak acid H2CO3 and strong base NaOH so it is basic.

5

20 (a) The reaction of calcium with water is less violent. The heat evolved is not sufficient for

hydrogen gas evolved to catch fire.

(b) (i) Magnesium or manganese

(ii) Lead, Copper, silver or gold

(iii) Al, Fe or zinc

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21 (a) (i) Starch (ii) ATP.

(b) Nutrition in paramecium. 6. 2. 3

Nutrition in amoeba – 6. 2. 3

Fig 6.5

5

22 A current carrying conductor experiences a magnetic force due to a magnetic field. The force

is maximum where the conductor is placed perpendicular to the direction of magnetic field.

For experiment refer Activity 13.7 Fig 13.12 page 230 NCERT Text book. Effect of change in

direction of current : Direction of force is also reversed., Fleming’s left hand rule, Effect of

change in direction of magnetic field : Direction of deflection is reversed.

Statement of Fleming’s left hand rule

5

23 ● Listing of three factors

● Definition of resistivity and derivation of its unit

● 2

R r

l

2R r

l

2 2 2

5 3 .1 4 (0 .0 2 1 0 ) m

1 m

62.8108 m

5

24 (a) When soft iron bar is placed inside a solenoid carrying current, it becomes a magnet as

long as current flows through the solenoid. Such temporary magnets are called

electromagnets.

(b) 13.2.4 Figure 13.11 Page 229 NCERT book

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(c) The field lines inside the solenoid are in the form of parallel straight lines, that is the

field is uniform inside the solenoid.

/ SECTION - B

25 (b)

1

26 (c)

1

27 (c)

1

28 (d) II only

1

29 (d) the lower end of the test-tube becomes slightly warm.

1

30 (c)

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31 c

1

32 (a) A

1

33 (d)

1

34 combination reaction - Calcium oxide

decomposition reaction – Ferrous sulphate

double decomposition reaction – Barium chloride and sodium sulphate.

2

35 V 1 8 0R 1 0

I 1 8,

2

36 In preparing temporary mount of a leaf peel safranine stain is preferred to use and extra stain

on this slide is removed by soaking with blotting paper

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CBSE Class 10 Science Sample Paper Set H