CBSE CLASS 8 SCIENCE SAMPLE PAPER - 4

CBSE

CLASS 8th Science

Sample Paper-4

Time: hour                                                                                                                Total Marks: 80

General Instruction:

• The question paper consists of 34 questions and is divided into four sections A, B, C and D.
• All questions are compulsory. Section A comprises question numbers 1 to 15. These are multiple choice questions carrying one mark each. You are to select one most appropriate response out of the four provided options.
• Section B comprises question numbers 16 to 22. These are SAQs carrying two marks each.
• Section C comprises question numbers 23 to 31. These are SAQs carrying four marks each.
• Section D comprises question numbers 32 to 34. These are SAQs carrying five marks each.

 SECTION – A Q. No. Questions Marks 1. Which group of animals does not give us a food product?(a) Honeybee and goat(b) Cow and buffalo(c) Silk moth and oyster(d) Fish and sheep 1 2. What do we call the storage sacs of the cell?(a) Plastids(b) Vacuoles(c) Mitochondria(d) Ribosomes 1 3. What term is used for the stoppage of the menstrual cycle?(a) Ovulation(b) Menstruation(c) Menarche(d) Menopause 1 4. The sac containing the testis is called the(a) Testicle(b) Scrotum(c) Epididymis(d) Oviduct 1 5. Coal burns in air to form mainly(a) Carbon dioxide(b) Carbon monoxide(c) Carbon(d) Water 1 6. Exhaustible natural resources in nature are(a) Limited(b) Unlimited(c) Abundant(d) Not available 1 7. Maximum light emitted by a candle comes from the(a) Red zone(b) Yellow zone(c) Blue zone(d) Orange zone 1 8. Tools meant for cutting and piercing always have(a) A long handle(b) Smooth edges(c) Sharp edges(d) All of the above 1 9. Carbon monoxide when inhaled binds to hemoglobin in the blood and forms a compoundcalled (a) Decarboxyhemoglobin(b) Oxyhemoglobin(c) Carboxyhemoglobin(d) Carboxylhemoglobin 1 10. Which of the following is not a chemical method to purify water?(a) Use of bromine(b) Use of Chlorine(c) Use of Hydrogen peroxide(d) Filtration 1 11. Rahul wants to purchase a house in a country. He has to choose a place among fourcountries. The seismographic readings of four countries are shown in the given figure.Among the given countries, which country should he select for living?(a)(b)(c)(d) 1 12. The frictional force exerted by a fluid is called(a) Brag(b) Drag(c) Drab(d) Thread 1 13. The production of partial vacuum by the removal of air is called(a) Function(b) Suction(c) Air function(d) Pumping 1 14. The given diagram shows four positions of the Moon in its orbit around the Earth.The full moon phase is represented by the position labeled(a) I(b) II(c) III(d) IV 1 15. Following are pairs of various constellations and the number of prominent stars in them.Choose the incorrect alternative.(a) Orion $-3$(b) Cassiopeia $-5$(c) Ursa major $-7$(d) Leo major $-9$ 1 SECTION B 16. What is the relation between deforestation and obtaining fuel? 2 17. 2 i. How is the zygote formed in sexual reproduction? ii. Where does the development of a baby take place in humans? 18. Name the four stages $A, B, C$ and $D$ shown in the 2 19. Justify the statement: Coal is formed by carbonisation. 2 20. How does the quantity of $\mathrm{CO}_2$ in the atmosphere rise and become excessive? 2 21. Select the optical aids among the following: Telescopic aids, Bifocal lenses, Tactual aids, Auditory aids, Contact lenses, Tinted lenses. 2 22. What do understand by sources of sound? Give any two examples. 2 SECTION C 23. Draw a labelled diagram of the human ovum. 4 24. List any four cell organelles found in animal cells and state their functions. 4 25. Differentiate between plant and animal cells. 4 26. Thermoplastics become soft on heating but thermosetting plastics do not. Explain the statement with the help of examples and draw labelled diagram also. 4 27. What are the different ways to extinguish fire? Explain. 4 28. 4 i. Discuss the working of a sprinkler system of irrigation. ii. Draw a well-labelled diagram of a hoe used to remove weeds. 29. When a wooden block is moving down an inclined plane what is the direction of thefrictional force acting on the block? Explain. 4 30. 4 i. Why is a ray of light considered as an idealisation? ii. What are the uses of periscopes? 31. 4 i. Why do the stars appear to us like point objects? ii. What is a meteorite? How does it help the scientists? SECTION D 32. 5 i. Name any two organisms which reproduce by budding. ii. What is a bud? iii. Draw a neat diagram to show the process of budding in Hydra. 33. Give reasons for the following: 5 i. A matchstick can light a tiny splinter of wood but not a big log of wood. ii. Forest fires occur during the hottest summer days. iii. Dry leaves catch fire easily but it is difficult to burn a heap of green leaves. 34. 5 i. What effects does an electric current produce when flowing through a conductingsolution? ii. A child staying in a coastal region tests the drinking water and also the sea water withhis tester. He finds that the compass needle deflects more in the case of seawater.Can you explain the reason?
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