Science Class Viii Question Paper

CLASS VIII QUESTION PAPER

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SUBJECT-SCIENCE

FULL MARKS: 100

SECTION-A

5X5=25

1. An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms. Muscular, contact, non-contact, gravity, friction, shape, attraction a. To stretch the bow, the archer applies a force that causes a change in its_______________. b. The force applied by the archer to stretch the bow is an example of __________ force. c. The type of force responsible for a change in the state of motion of the arrow is an example of a ___________ force. d. The type of force responsible for a change in the state of motion of arrow is an example of a ______________ force. e. While the arrow moves towards its target, the forces acting on it are due to __________ and that due to ___________ of air. 2. Give one word answer a) Separation of grains from the chaff. b) Black gold c) Slow process of conversion of dead vegetation into coal. d) Process of separating the various constituents/ fraction of petroleum. e) Part of the cell that contains organelles. 3. Tick true / false against the following statements. a) Coke is almost pure form of carbon. b) Fuel efficiency is expressed in units of kg/ kilojoules. c) Increased percentage of CO2 in air has been linked to global warming. d) Force has magnitude only. e) North Pole of a magnet attracts North Pole of another magnet.

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CLASS VIII QUESTION PAPER

4. Answer the following: a) What is the term used for secretion of endocrine glands responsible for changes taking place in the body? b) Name the plastic used for non stick coating of the cookware. c) What are the advantages of using LPG as fuel? d) Why fossil fuels are exhaustible natural resources? e) Which zone of a flame does a gold smith use for melting gold and silver? 5. Complete the word puzzle 1

C

2 G 3

4

E

Down 1. Species on the verge of extinction. 2. A book carrying information about endangered species. Across 1. Species which have vanished. 3. Species found only in a particular habitat. 4. Varieties of plants, animals and microbes found in an area.

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CLASS VIII QUESTION PAPER

SECTION-B

10X2=20

6. What will happen if a farmer stores the harvested grains without drying them properly? 7. Fill in the blocks given below: HUMAN DISEASE CAUSATIVE MICROBE MODE OF TRANSMISSION Hepatitis B -------------------Malaria ------------------8. Jams, jellies and squashes are preserved by sugar. Why? 9. Distinguish between thermosetting and thermoplastics with examples. 10. Why do people consider plastics as ‘Material of choice’? 11. Why it is not advisable to store lemon pickle in aluminium containers? 12. Write one important use of the following substances: Coke, Bitumen, CNG, and Paraffin Wax. 13. In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 KJ. Calculate the calorific value of the fuel. 14. Give two differences between eukaryotes and prokaryotes. 15. 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. SECTION-C 16. 17. 18. 19. 20. 21. 22.

23. 24.

25.

10X3=30

List the changes in the body that take place at the time of puberty. With schematic figure explain the sex determination in human being. Explain how deforestation leads to reduced rainfall? What are weeds? How do they affect crop plants? Write two ways of removing them from the field. Give three important differences between manure and fertilizers. ‘Avoid Plastics as far as possible’. Comment on this advice. One day Reeta went to a jeweler’s shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest the reason for the loss in weight? Expand PCRA. Give four suggestions how to save petrol/diesel while driving. Give reasons: a) Water is not used in extinguishing fire involving electrical equipments. b) Luminous zone of a flame gives black soot. Give one difference between: a) Viviparous and Oviparous b) External and Internal fertilization. c) Sperm and Ovum

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CLASS VIII QUESTION PAPER

SECTION-D

5X5=25

26. Answer the following: a) Define force. b) What are the changes observed when force is applied on an object. c) Give example of two contact forces and two non contact forces. 27. Draw a neat diagram of plant cell and label five key parts to identify it as a plant cell. 28. What do you mean by asexual reproduction? With neat diagram explain any two methods of this type of reproduction in animals. OR a. Define Metamorphosis. b. With diagram explain the life cycle of frog. 29. Give reasons for the following: a) Aluminium foils are used to wrap food items. b) Immersion rods are made up of metallic substances. c) Copper cannot replace zinc from its salt solution. d) Phosphorous is stored in water. e) The bells in temples are made up of metals. 30. Answer the following: a) What are antibiotics? Give example of two commonly known antibiotics. b) What are antibodies? How are they important for us? c) Give example of two vaccine preventable diseases in children.

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