JKBOSE 8th Class Model Paper Science

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Class: 8th Max. Marks: 50

Paper: Science Time Allowed: 3Hrs
2 1/2 Hrs
Summative Assessment
Section A

Multiple Choice Questions (13×1=13)
Choose the Correct option
Q1. If „O‟ is microorganism which lives in water and reproduces by
budding. Identify the organism „O‟ from the microorganisms given
below:
(A) Euglena (B) Paramecium
(C) Coral (D) Planarians

Q2. The number of images formed by two adjacent plane mirrors depends
on the angle between the mirrors as shown in figures below.

Find the number of images formed when angle between mirrors is 60°.
(A) 6 (B) 5
(C) 3 (D) 4
Q3. Identify the natural source of air pollution.
(A) Automobile exhausts (B) Smoke from factories

(C) Coal fired Power stations (D) Volcanic eruptions and forest
fire
Q4. The chemical formula of the rust.
(A) (B)
(C) (D)
Q5. Water which is suitable for drinking is called.
(A) Sewage water (B) Fresh water
(C) Potable water (D) Sea water
Q6. The way that is not used to conserve water?
(A) Reuse (B) Reduce
(C) Recycle (D) Replace

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Q7. Identify the microorganisms shown in the figure below:

(A) A-Giardia, B-Trypanosoma, C-Euglena, D-Amoeba
(B) A- Amoeba, B-Trypanosoma, C-Paramecium, D- Giardia
(C) A- Trypanosoma, B- Giardia, C-Euglena, D-Amoeba

(D) A- Euglena, B- Giardia, C- Amoeba, D- Trypanosoma

Case Based Questions (Q8-Q10)

Case: A student performed an activity to show the effect of manure and
fertilizers on the growth of seedlings. He took three pots A, B and C with
same kind of seedlings as shown below. Pot A contains ordinary soil without
any manure or fertilizer, Pot B contains soil that is mixed with manure and
Pot C contains soil mixed with fertilizer.
The important types of manures are Farmyard Manure (FYM), Green
Manure (GM), Compost, Sea Manure and Poultry Manure. While, the
important types of fertilizers are Nitrogen, Phosphate, and Potash (NPK).
Other fertilizers are Urea, Calcium Ammonium Nitrate (CAN) etc.

Q8. Which Pot contains soil that is mixed with Potash or Urea?
(A) Pot A (B) Pot B
(C) Pot C (D) In Pot B and Pot C

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Q9. Pot C shows the maximum growth in comparison to Pot B, this is
because:
(A) Fertilizers are not good for plants
(B) Fertilizers are not soluble in water
(C) Fertilizers are rich in plant nutrients like Nitrogen, Phosphorus
and Potassium (NPK).
(D) Fertilizers have all the nutrient that a plant needs.
Q10. Identify correct match of Manure and Fertilizer.
(A) GM is Chemical Fertilizer and FYM is Chemical Fertilizer
(B) CAN is Chemical Fertilizer and NPK is Manure
(C) NPK is Manure and GM is Manure
(D) NPK is Chemical Fertilizer and FYM, GM is Manure.

Assertion and Reasoning Type Questions (Q11-Q13)

Directions: In the following questions, a statement of Assertion (A) is
followed by a statement of Reason (R). Mark the correct choice
as:
(A) Both Assertion (A) and Reason (R) are true and reason (R) is the
correct explanation of assertion (A).
(B) Both Assertion (A) and Reason (R) are true but reason (R) is not
the correct explanation of assertion (A).
(C) Assertion (A) is true but Reason (R) is false.
(D) Assertion (A) is false but Reason (R) is true.
Q11. Assertion (A): The bubbles of a gas may be formed on the
electrodes.
Reason(R): The passage of an electric current through a conducting
solution causes chemical reaction.
Q12. Assertion (A): Graphite is a non-metal.
Reason(R): It is the only non-metal which is good conductor of
electricity.
Q13. Assertion (A): Lighting strikes could destroy life and property.
Reason(R): Lighting conductors can protect buildings.

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Section B
Very Short Answer Type Questions (6×2=12)
Q14. Student-A has to push a lighter box and student-B has push a similar
heavier box on the same floor. Who will have to apply a larger force
and why.
Q15. Why do new automobiles tyres have deep grooves?
Q16. Give two differences between a zygote and a foetus.
Q17. Keeping in view the Figure 1. What will be the angle of incidence when
the sum of angle of incidence and reflection is ?

Figure 1
Q18. What are various characteristics of image formed by a plane mirror?
Q19 What happens when
I. Dilute sulphuric acid is poured on a copper plate.
II. Iron nails are placed in copper sulphate solution.
Write word equations of the reactions involved.

Section C

Short Answer Type Questions (5×3=15)
Q20. Lightning and thunder take place in the sky at the same time and at
the same distance from an observer. Lightening is seen earlier and
thunder is heard later. Explain why?
Q21. A child studying in a coastal region test 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. What are the reasons?
Q22. Define asexual reproduction. Describe two methods of asexual
reproduction in animals.
Q23. How is excessive accumulation of carbon dioxide in the atmosphere
related with global warming?
Q24. What are antibiotics? What precautions must be taken while taking
antibiotics?

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Section D

Long Answer Type Questions (2×5=10)

Q25. Make Sketches of animal cell and plant cell. State two differences
between them.
OR
“Cells are basic structural units of living organism”. Explain?
Q26. Harshit a student of class 8th is observing certain changes in his body
like hoarness in voice. He also observes that these changes are taking
place in all his classmates who are boys and these changes are
different from his classmates who are girls. These changes mark the
onset of a certain stage. What this stage is called and explain the
changes associated with it.
OR
Duhan observes his grandmother scolding his aunt every day for
giving birth to three baby girls instead of a boy. Duhan immediately
stood up and told his grandmother that giving birth to a boy or a girl is
not in her hands and there is a scientific mechanism behind it. Explain
the mechanism which makes a fertilized egg develop into a boy or a
girl.
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