Class 8 Sample Paper Science (Half Yearly)

SAMPLE
PAPER
Half Yearly Examination

Prepared For
NCERT BASED SYLLABUS
Applicable For
CBSE BOARD AND STATE BOARD USING NCERT

WWW.

HALF YEARLY EXAMINATION
SAMPLE QUESTION PAPER
Class - VIII Subject –Science
Time – 3 Hours Maximum Marks- 80

Attempt all questions. However there are internal choices. Rough work to be done in
the right margin.

PHYSICS

MULTIPLE CHOICE QUESTIONS [2 X 1 =2]

1. Which of the following is a bad conductor of electricity?
a. Distilled water
b. Silver nitrate
c. Sulphuric acid
d. Copper sulphate

2. Whenever the surfaces in contact tend to move or move with respect to each other, the force of
friction comes into play
a. only if the objects are solid.
b. only if one of the two objects is liquid.
c. only if one of the two objects is gaseous.
d. irrespective of whether the objects are solid, liquid or gaseous.
VERY SHORT ANSWER QUESTIONS [2X1 = 2]

3. What is an electrolyte? Give one example.

4. A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.
SHORT ANSWER QUESTIONS [3 x 2 = 6]

5. a. Calculate the pressure exerted by a force of 20N on an area of 20 cm².
b. Define one newton.

6. Explain why a pencil will write on paper but not on glass?

7. What is the-difference between noise and music? Sketch the wave forms
LONG ANSWER QUESTIONS [4x 3 = 12]

8. a. Sound wave is called mechanical waves. Why?
b. Differentiate between infra- sonic sound and ultra- sonic sound

9. a. A force of 10 kgf produces an acceleration of 4.9 m/s² in a body. Calculate the mass of the
body.
b. Define Pressure. Write the relation between pressure force and area. Name the instrument
used to measure atmospheric pressure
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10. What are the three factors on which fluid friction depends?

11. a. A child staying in coastal area tests the drinking water and also the sea water with his tester.
He finds that the compass needle deflects more in the case of sea water. Can you explain the
reason?
b. Name the process to decompose water into hydrogen and oxygen.
VERY LONG ANSWER QUESTIONS [1x 5 = 5]

12. a. Describe an activity to show that sound need a material medium for its propagation.

b. What is the range of hearing of human ear?

c. Write any two uses of ultra-sonic sound.
OR

a. Describe an activity to show that liquid pressure increases with the depth.
b. We can increase the pressure by exerting same force. Explain how?

CHEMISTRY
SECTION A [1×5=5]

1. An oxide of sulphur turns blue Litmus red. Is it acidic or basic?
2. a. Name the non metal element used in antiseptic.
b. Name the metal present in blood.
3. Name the raw material used for the manufacture of detergents, synthetic fibres and many
useful polymers.
4. The synthetic fibre which resemble silk in texture is
a. Nylon
b. Acrylic
c. Polyester
d. Rayon
5. Which of the following is a polymer of glucose
a. Cotton
b. Teflon
c. Bakelite
d. PVC
SECTION B [2×4=8]

6. A metal 'A' is added to a blue coloured solution ' B' .After sometime we observe that the blue
colour changes to green colour due to formation of 'C'and there is reddish brown deposit of
metal 'D'.
a. Name the reaction which is taking place above
b. What is the chemical name of' B '?

c. Between the two metals 'A' and 'D' which is more reactive?
d. Name the compound 'C'.

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7. Describe an activity to show that thermoplastics are bad conductors of electricity.
8. Mention one advantage and one disadvantage of synthetic fibres.
9. Write the difference between exhaustible resources and inexhaustible resources.

SECTION C [3×3=9]

10. a. Which metal will release hydrogen gas on reacting with strong bases?
b. Copper is kept open in air, it slowly loses its Shiny brown surface and gains a green
coating.
i) Write the chemical equation of the above reaction .
ii) What is the nature of the green coating?
11. a. Why are metals used for making bells?
b. Define malleability .
c. Name a metal that is kept under kerosene. Explain why it is stored in kerosene.

12. a. A person has to make a non stick pan. He has three types of plastics Bakelite , Teflon and
PVC .Which plastic he should use for coating?
b. State any two disadvantages of plastics.
c. Plastics are non-corrosive in nature- Explain.

SECTION D [5×1=5]
13. a. Draw well labelled diagram to show petroleum and natural gas deposit under the surface of
the earth.
b. What is refining of Petroleum ?
c. Which method is used for the refining of Petroleum?

OR
14 a. Draw a well labelled diagram of destructive distillation of coal and label all the products
b. Write the full form of PCRA.
c. Why is natural gas called clean fuel?

BIOLOGY

I. Choose the correct option: [1X2=2]
1. Read the given statements and select the correct option.
Statement 1 –All prokaryotes have cell wall but eukaryotes do not.
Statement 2 – Prokaryotes have well defined nucleus but eukaryotes have primitive nucleus.

a. Both the statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
b. Both the statements 1 and 2 are true but statement 2 is not the correct explanation of
Statement 1.
c. Statement 1 is true but statement 2 is false.
d. Both the statements 1 and 2 are false.

2. Refer to the given passage.
The mosquito P is a carrier of a virus that spreads a disease Q. Another mosquito R is a carrier
of a protozoan that spreads a disease called S.
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Select the correct option which correctly identifies P,Q,R and S.
a. P- Female Aedes, Q- Dengue, R- Female Anopheles, S- Malaria
b. P-Plasmodium, Q- Dengue, R-Malaria, S- Female Anopheles
c. P- Female Aedes, Q- Malaria, R- Female Anopheles, S- Dengue
d. P-Female Anopheles, Q- Malaria, R- Female Aedes, S- Typhoid
II. Answer the following questions in one sentence : [1x2=2]
3. The size of the cells of an organism has no relation with the size of its body. Do you agree? Give
reason for your answer.
4. State any two factors on which time and frequency of irrigation depends.

III. Answer the following questions briefly:
5. a. Why do plant cells need a cell wall whereas animal cells do not? [1+1=2]
b. Mention one advantage that amoeba derives by changing its shape.
6. Threshing is an important agricultural practice. Explain what is it and how is it done in modern
times. [2]
7. a. What is protoplasm? [1+1=2]
b. Mention one point of difference between cell membrane and nuclear membrane.

8. Why is the soil suitably levelled before sowing the seeds? Mention two points. [2]

IV. Answer the following questions as directed:
9. a. Despite favourable climatic conditions a farmer’s crop failed to give good yield. Give any two
possible reasons for this.
b. ‘Prolonged use of pesticides is undesirable.’ Comment on this statement. [2+1=3]

10. a. Draw a neat diagram of an animal cell and label any three parts.
b. Name one organelle found only in plant cells which contains a green pigment. Also list one
cell structure which is common to both plant and animal cells. [2+1=3]

11. a. What is meant by nitrogen fixation? [1+2=3]
b. Complete the following flowchart of nitrogen cycle by filling the blanks (a), (b), (c) and (d).
(Do not copy the flowchart. Write only the answers.)

V. Answer the following questions in detail:

12. a. What is meant by food preservation? [1+3+1=5]
b. Explain any three methods of food preservation.
c. Fresh milk is boiled before consumption while processed milk stored in packets can be
consumed without boiling. Justify the statement.
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OR
a. What are antibiotics? [1+2+1+1=5]
b. Explain how a vaccine provides immunity.
c. Name one plant disease each caused by
(i) Fungi (ii) Bacteria
d. Write the causative agent of
(i) Tuberculosis (ii) Hepatitis A

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