Class 8 Question Paper 2023-24 Science (Half Yearly)

2023-24
HALF YEARLY
EXAM
NCERT BASED
SYLLABUS
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FOR
CBSE BOARD
AND
STATE BOARDS

KENDRIYA VIDYALAYA SANGATHAN, LUCKNOW REGION
MID TERM EXAMINATION – 2023 – 24
CLASS 8TH
SUBJECT: SCIENCE
SET – 1
Max Marks: 60 Time Allotted: 2½ Hrs.

Instructions:
1. Section A comprises of question numbers 1 to 10. 2. Section B comprises question numbers 11 to 20.
These are MCQ carrying one mark each. You These are VSAQs carrying two marks each.
have to select one most appropriate response out
of the four provided options.
3. Section C comprises question numbers 21 to 25. 4. Section D comprises question numbers 26 to 28.
These are SAQs carrying three marks each. These are Case Study Based / Long answer type
questions carrying five marks each.
5. All questions are Compulsory!

Q
Question Marks
No.
Section – A: Multiple Choice Questions
1. Which of following is not a fertilizer: 1
A. Urea B. Cow-dung
C. Potash D. Super phosphate
OR
The use of Cultivator saves:
A. Labour B. Time C. Both A & B D. Money

2. Virus reproduces: 1
A. only outside the cells of the host organisms
B. only inside the cells of the host organisms
C. both inside and outside the cells of the host organisms
D. none of these

3. Which of the following gives us pollution free environment on burning: 1
A. Wood B. Kerosene
C. Biogas D. Cow dung cake

4. Which of the following is inexhaustible natural resources: 1
A. Coal B. Petroleum C. Minerals D. Sunlight

5. The hottest zone of candle flame is: 1
A. outermost zone B. innermost zone
C. middle zone D. all of these

6. In which of the following conditions combustion takes place: 1
A. the presence of a combustible substance
B. the presence of air with sufficient amount of oxygen
C. the temperature of combustible substance should be more than its ignition
temperature
D. all the above conditions are necessary

7. Flora means: 1
A. wild plant species B. domesticated plant species
C. animals D. both (a) and (b)

8. Natural causes of deforestation include: 1
A. forest fires B. smoking cigarette
C. electric current D. cloud burst

9. Knives, needles, saws are made sharp or pointed to: 1
A. decrease pressure B. increase pressure
C. can’t say D. none of these
OR
All the objects present in universe are bounded with a force called_______.
A. Electrostatic force B. Muscular force
C. Gravitational force D. Contact force

10. The easiest way to move a heavy wooden crate is to: 1
A. place it on a trolley B. tie a rope on one end and pull
C. push it D. none of these

Section – B: Very Short Answer Type Questions
11. 2

a) Name the bacteria that has a symbiotic relationship with above plant.
b) What is the role of this bacteria.
12. Match the organisms in Column A with their action in Column B: 2
Column A Column B
i. Lactobacillus a) causing AIDS
ii. Yeast b) causing malaria
iii. A protozoan c) baking of bread
iv. A virus d) fixing nitrogen
e) setting of curd

13. 2

a) What does the above figure illustrate?

b) If you drill another similar hole at point X then the stream of water that will come out
of this hole will have less pressure or more pressure as compared to the streams of
water shown in the figure.
14. Expand PCRA. What are its advices? Write any two. 2
OR
Why should we use coal and petroleum very judiciously?
15. 2

A B
Identify the types of force in the given situation A and B also classify these forces as contact /
non-contact force.
16. State whether the following statements are true or false. 2
a) Fossil fuels can be made in the laboratory.
b) Coke is almost pure form of carbon.
17. 2

a) Why does the flame flicker and give smoke in the figure ‘b’ above?
b) Why does the flame go off in figure ‘c’ above?
OR
Make a labelled diagram of a candle flame.
18. Give two examples each of situations that shows friction is a friend and a foe. 2
19. Explain why sportsmen use shoes with spikes. 2
OR
Explain why objects moving in fluids must have special shape.
20. What is red data book? 2
OR
What are endangered species?
Section – C: Short Answer Type Questions
21. Compare manure and fertilizer (4 points). In your opinion which is better, give reason (2 3
points) for your answer.
OR
What is weeding in agriculture? Write any two methods of weeding.
22. Explain two modern methods of irrigation. 3
OR

A B
Name the above given agricultural tools A and B, also give their function.
23. Give three effects of force. 3
OR
a) Explain why shoulder bags are provided with broad straps and not thin straps.
b) Define pressure. Give the mathematical expression for it.
24. Describe how coal is formed. What is this process called? 3
25. What are lubricants? Give two examples of lubricants along with the situation where they are 3
used.

Section – D: Case Study Based / Long Answer Type Questions
26. Write the causes (3 points) and consequences (7 points) of deforestation. 5
OR
Read the passage and answer the question given below.
A great variety of plants and animals exist on earth. They are essential for the well-being and
survival of mankind. To preserve biodiversity, to prevent extinction of endangered species, and
to maintain ecological balance in nature, wildlife and forests should be conserved. Habitat is a
place in environment where an organism lives. Today, a major threat to survival of these
organisms is deforestation. We know that deforestation means clearing of forests and using that
land for other purposes. Trees in the forest are cut for many purposes. Some natural causes of
deforestation are forest fires and severe droughts. The answer to deforestation is reforestation.
Reforestation is restocking of the destroyed forests by planting new trees. The planted trees
should generally be of the same species which were found in that forest. We should plant at
least as many trees as we cut. Reforestation can take place naturally also.
a) A place in environment where an organism lives is ________.
A. Home B. Resort C. Habitat D. Reservoir

b) Wildlife and forests should be conserved:
A. To preserve biodiversity.
B. To prevent extinction of endangered species.
C. Maintain ecological balance in nature.
D. All of the above.

c) Deforestation takes place by:
A. Human activities B. By natural calamities
C. Both a and b D. None of these

d) Restocking of the destroyed forests by planting new trees is called:
A. Deforestation B. Afforestation
C. Reforestation D. None of these

e) State whether the following statement is true or false:
There is no biodiversity in the sea.

27. Read the passage carefully and attempt the questions given below. 5
A chemical process in which a substance reacts with oxygen to give off heat is called
combustion. The substance that undergoes combustion is said to be combustible. It is also
called a fuel. The fuel may be solid, liquid or gas. Sometimes, light is also given off during
combustion, either as a
flame or as a glow.
The lowest temperature at which a substance catches fire is called its ignition temperature. The
substances which have very low ignition temperature and can easily catch fire with a flame are
called inflammable substances. Examples of inflammable substances are petrol, alcohol,
Liquefied Petroleum Gas (LPG)
a) What are combustible substances?
A. Substance that undergoes combustion
B. Substance reacts with ozone
C. Substance that glows
D. All of these

b) Fuels can be:
A. Solids only B. Liquids only
C. Gases only D. All of these

c) What is ignition temperature?
A. Lowest temperature at which a substance catches fire.
B. Temperature when water boils
C. Temperature at which ice is formed
D. Temperature of LPG.

d) Identify the inflammable substance from the following.
A. Soil B. Water
C. Alcohol D. Vinegar

e) What are inflammable substances?
A. Substances with low ignition temperature
B. Substances which catch fire easily with a flame
C. Only option A
D. Both a and b

28. Preservatives are used to protect our foodstuff for longer time. Answer the following question: 5
a) What is food poisoning?
b) Name the food Preservatives used to preserve jams and squashes?
c) By which process milk is preserved in pouches? Explain this process.
d) How do sugar acts as preservative?
OR
Write seven points on the usefulness of microorganisms in our lives also give three points on
the harms caused by microorganisms.

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