Class 8 Science SGRR Public School Half Yearly Exam Question Paper 2025-26

 

Periodic Assessment-II/Half Yearly Exam-2025-2026

SGRR Public School

Science

Time: 2½ Hrs.]

Class: 8

Μ. Μ.: 80

General Instructions:

(i) Attempt all the questions.

(ii) Internal choice is given.

(iii) Handwriting should be neat & clean.

(iv) Diagram should be well-labelled.

1. Multiple Choice questions:

5×1-5

(a) Animals whose numbers are diminishing to level that they might face extinction is known as:

(1) Endemic

(ii) Endangered

(iii) Extinct

(iv) Fauna

(b) Which of the following does not reduce friction?

(1) Streamlined shape.

(ii) Lubricant

(ii) Sand

(iv) Soil

(c) The term used for the process of separation of grains from chaff by blowing air:

(i) Sieving

(ii) Winnowing

(iii) Threhing

(iv) Hand picking

(d) What is the minimum temperature at which a substance catches five and burns on its own:

(i) Boiling point

(ii) Melting point

(ii) Ignition temperature

(iv) Freezing point

(e) The wear and tear in the machine part is due to:

(i) Electrostatic force

(ii) Muscular force

(iii) Fictional force

(iv) Gravitational force

2. Fill in the blanks: (10×1)

(a) is a process of heating the milk at high temperature then coding it suddenly and storing it.

the person is (b) When the clothes of a person catch covered with a to extinguish fire.

3.

(c) Conversion of fertile land into desert is called.................

(d) The the area, larger the pressure on a surface.

(e) Friction produces

(f) Damaged seeds would............. on top of water.

(g) Least polluting fuel for vehicle is

(h) Burning of wood and coal causes of air.

(i) A place where animals are protected in their natural habitat is called

5×2=10

Define the following terms: ( Biodiversity, Electrostatic force, Animal husbandary, Drag, Global warming, Communicable diseases, Fossil fuels.

4. True/False:

(a) Coal is a mixture of various substances.

5 * 1 = 5

(b) Muscular force and frictional force are the examples of non-contact force.

(c) Microorganism can be seen with naked eyes.

(d) Fertilizers are organic substances obtained from the decomposition of plants and animal wastes.

(e) Endemic species are the one that are exclusively found in a particular area.

5. Match the column:

5 * 1 = 5

(a) Kharif crops

oil and grease

(b) Lactobacillus

attract each other

(c) Unlike poles

cutting of trees

(d) Lubricants

paddy and maize

(e) Deferestation

setting of curd

6. Give two difference: (any three)

3 * 2 = 6

(a) Flora and fauna.

(b) LPG and wood.

(c) Endangered species and Extinct species.

(d) Wildlife sanctuary and biosphere reserve.

(e) Fertilizers and manure.

5 * 1 = 5

7. Give one word answer:

(a) The condition developed by the consumption of spoilt food.

(b) The resources which are obtained form nature.

(c) The most common fire extinguisher.

(d) The force which always oppose motion.

(e) The force exerted by magnet.

8. Give short answers: (any 7)

* 2 = 14

(a) Explain why sportsmen use shoes with spikes?

(b) Give two examples of situations in which applied force cause a change in the shape of an object.

(c) What is Red Data Book?

(d) List the conditions under which combustion can take place.

(e) Describe the characteristics and uses of coke.

(f) What are antibiotics?

(g) If wheat is sown in the Kharif season, what would happen?

Discuss.

(h) What do you mean by carbonisation?

00 Give two examples each of:

(i) Solid fuels and (ii) Liquid fuels.

501-Science

(4)

VIIIth-A-2800

9. Long Answes:

(any)

5×3-15

(a) In an experiment, 4-5 kg of a fuel was completely burnt. The heat produced was measured to be 180000 KJ. Calculate the calorifie value of the fuel.

(b) Give examples to show that friction is both a friend and a foe.

(c) Write 6 line on the usefulness of microogranisms in our lines.

(d) Explain the process of formation of petroleum.

(e) What will happen, if:

(1) The habitat of an animal is disturbed.

(ii) The top layer of soil is exposed.

(f) Explain how soil gets affected by the continuous plantation of crops in a field.

(g) An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?

10. Draw a well-labelled diagram:

A candle flame

OR

5

Nitrogen cycle.

OR

Liquids exert equal pressure at the same depth.