class 8 pt 1 science question paper

SCIENCE

PERIODIC TEST-1 

(2023 – 24)

CLASS - VIII

Time: 1.30 hours 

 Maximum Marks: 40

General Instructions:
The Question Paper contains three sections.
Section A contains 8 Multiple choice questions of 1 mark.
Section B contains case-based 12 questions of 1 mark each.
Section C contains 7 questions of 2 and 4 marks each, under which choices are given.

PART A

Choose the correct answer: (1x8=8 M)

Q1. The pressure which is exerted by the air around us is known as?

(a) force 

(b) atmospheric pressure 

(c) muscular force 

(d) friction

Q 2. When two forces act in opposite directions, then net force acting is the

(a) the sum of two forces 

(b) difference between two forces

(c) both of these 

(d) none of these

Q 3. The disease caused by protozoa is

(a) tuberculosis 

(b) polio 

(c) typhoid 

(d) malaria

Q 4. The agricultural instrument used for the removal of weeds is

(a) sprinkler 

(b) khurpi 

(c) seed drill 

(d) plough

Q 5. Which of the following is not used as food preservatives?

(a) Salt 

(b) Sugar 

(c) Vinegar 

(d) Methane

Q6. Supply of water to crops at appropriate intervals is called irrigation and which type of irrigation is useful in a place of water scarcity.

(a) Sprinkler system 

(b) Drip irrigation 

(c) Both 

(d) None

Q 7.Which of the following is used to manufacture steel?

(a) Coke 

(b) Coal gas 

(c) Coal tar 

(d) All of the above

Q 8. Least polluting fuel for vehicles is

(a) coke. 

(b) kerosene. 

(c) diesel. 

(d) CNG

PART B

Observe the given information and answer the following questions: (1 x 4 = 4 M)

These microorganisms play an important role in our lives. They are our friends and foe as well. Bacteria help to convert nitrogen into a soluble form and complete the nitrogen cycle as well. Some make the food spoiled and changes its smell and taste. Some help in some medicinal use.

Q9. Bacteria present in root nodules of pea:

(a) Coli 

(b) Plasmodium 

(c) Rhizobium 

(d) Penicillin

Q10. Microorganisms that cause disease are also known as:

(a) pathogens 

(b) fungi 

(c) antigen 

(d) microbes

Q11. The agents thattransmit pathogens from an infected person to a healthy one is called:

(a) fungi 

(b) germs 

(c) carrier 

(d) none of these

Q 12. Penicillin was discovered by

(a) Edward Jenner 

(b) Louis Pasteur 

(c) Alexander Fleming 

(d) Robert Koch

Observe the given picture and answer the following questions: (1 x 4 = 4 M)

Q13. Force exerted on a unit area is called:

(a) Electrostatic force 

(b) Pressure

(c) Gravitational force 

(d) Both A and B

Q14. The force exerted by our muscles is called

(a) electrostatic force 

(b) muscular force

(c) gravitational force 

(d) non-contact force

Q15. Two boys A and B are applying force on a block. If the block moves towards the boy A, which one of the following statements is correct?

(a) Magnitude of force applied by A is greater than that of B

(b) Magnitude of force applied by A is smaller than that of B.

(c) Net force on the block is towards B.

(d) Magnitude of force applied by A is equal to that of B.

Q16. Which of the following is proper example(s) to explain that force on an object may change its shape

(a) A ball of dough rolled into chapati

(b) Pressing a rubber ball kept on table

(c) Making model using clay

(d) All of the above

Read the passage and observe the picture carefully. Answer the following questions:

Refining of Petroleum: Petroleum refining or Oil refining is an industrial process in which crude oil is extracted from the ground and transformed and refined into useful products. Observe the given picture and answer the following questions:

Q17.What are the various constituents that are obtained from petroleum refineries.

Q18.Mention any two tips for how to save petrol/diesel while driving?

Q19. You see that the layer containing petroleum oil and gas is above that of water. Why is it so?

Q 20.Is petroleum also fossil fuel. How?

PART C

Q 21. Explain how fertilisers are different from manure (2 M)

OR

Write the usefulness of microorganism in our lives (any 4 points).

Q22.A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad. (2 M)

OR

A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?

Q 23. What are the advantages of using CNG and LPG as fuels? Also write full form of these fuels. (2 M)

Q 24. What are antibiotics? What precautions must be taken while taking antibiotics? (2 M)

Q25. Answer in one word (Any four)(1 x 4 = 4M)

• Name the process and organism for converting sugar into alcohol.

• Name the method for boiling milk at high temperature and then quickly cooling at low temperature.

• Name one weedicide, generally used in fields.

• Name a method of replenishing the soil with nutrients.

• Name the forces acting on a plastic bucket containing water held above ground level in your hand

Q26. Draw a neat and labelled Nitrogen cycle. (4M)

OR

Draw the diagram of each agricultural implements or tools used for ploughing, sowing,irrigation and harvesting with their names.

Q 27. Describe how coal is formed from dead vegetation. What is this process called? (4M)

जय हिन्द : जय हिंदी 

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