Practice Question Papers · with Answers

CBSE / NCERT Class 8 Science Practice Question Papers

Download free CBSE / NCERT Class 8 Science practice question papers with full answer keys. These are original Brain Grain model papers — built from our verified question bank to the real exam blueprint (sections, marks and solutions) — perfect for board revision and model tests.

Brain Grain · braingrain.in
Science — Practice Paper · Set 1
Class: 8CBSE / NCERTMax Marks: 34
Name: ____________________Reg No: ____________
Part I — Multiple Choice Questions 10 × 1 = 10

Choose the correct answer. (Answer all questions.)

1.Sound can travel througha. gases onlyb. solids onlyc. liquids onlyd. solids, liquids and gases[1]
2.Arrange rolling, static and sliding frictions in decreasing order.a. rolling, static, slidingb. rolling, sliding, staticc. static, sliding, rollingd. sliding, static, rolling[1]
3.The process of conversion of sugar into alcohol is calledi. nitrogen fixationii. mouldingiii. fermentationiv. infection[1]
4.Internal fertilisation occursi. in female bodyii. outside female bodyiii. in male bodyiv. outside male body[1]
5.Voice of which is likely to have minimum frequency?a. Baby girlb. Baby boyc. A mand. A woman[1]
6.A tadpole develops into an adult frog by the process ofi. fertilisationii. metamorphosisiii. embeddingiv. budding[1]
7.Reproductive age in women starts when theiri. menstruation startsii. breasts start developingiii. body weight increasesiv. height increases[1]
8.Water rises in a dropper after releasing the pressed bulb because ofa. pressure of waterb. gravity of the earthc. shape of rubber bulbd. atmospheric pressure[1]
9.The most common carrier of communicable diseases isi. antii. houseflyiii. dragonflyiv. spider[1]
10.Yeast is used in the production ofi. sugarii. alcoholiii. hydrochloric acidiv. oxygen[1]
Part II — Short Answer Questions 12 × 2 = 24

Answer briefly. (Answer all questions.)

11.A book slides down a tilted desk. Show the direction of friction.[2]
12.Does pure water conduct electricity? If not, how can it be made conducting?[2]
13.What are the major groups of microorganisms?[2]
14.For copper purification, which electrode should impure copper be connected to and why?[2]
15.A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.[2]
16.Why is lightning seen before thunder is heard?[2]
17.Fill in the blanks: draw water by ___ the rope; charged body ___ uncharged body; loaded trolley must be ___; north pole ___ north pole.[2]
18.Answer briefly: why conserve biodiversity, why protected forests may not be completely safe, how tribals depend on jungle, causes and consequences of deforestation, Red Data Book and migration.[2]
19.Give two examples where applied force changes the shape of an object.[2]
20.Write a short paragraph on the harmful effects of microorganisms.[2]
21.What force makes a rubbed inflated balloon stick to a wall?[2]
22.Match: Kharif crops, Rabi crops, Chemical fertilisers, Organic manure with their correct descriptions.[2]
🔑 Show Answer Key — Set 1
  1. 1. (d) solids, liquids and gases.
  2. 2. (c) static, sliding, rolling.
  3. 3. (iii) fermentation.
  4. 4. (i) in female body.
  5. 5. (c) A man.
  6. 6. (ii) metamorphosis.
  7. 7. (i) menstruation starts.
  8. 8. (d) atmospheric pressure.
  9. 9. (ii) housefly.
  10. 10. (ii) alcohol.
  11. 11. Friction acts up the inclined surface, opposite to the downward sliding motion.
  12. 12. Pure water is a poor conductor. Adding a small amount of salt, acid or base makes it conducting.
  13. 13. Bacteria, fungi, protozoa, algae and viruses.
  14. 14. The impure copper rod should be connected to the positive terminal. Copper dissolves from it into solution and deposits on the thin pure copper plate connected to the negative terminal.
  15. 15. Frequency $=10$ Hz and time period $=0.1$ s.
  16. 16. Light travels much faster than sound, so light from lightning reaches us before the sound of thunder.
  17. 17. Pulling; attracts; pushed; repels.
  18. 18. Biodiversity must be conserved to maintain ecological balance and resources. Protected forests may still face poaching and human interference. Tribals depend on forests for food, fuel, medicine and livelihood. Deforestation is caused by agriculture, industry, roads, housing and forest fires; it causes erosion, floods, droughts and loss of species. The Red Data Book records endangered species. Migration is periodic movement of animals or birds to another region for better climate, food or breeding.
  19. 19. Squeezing a sponge and stretching a rubber band.
  20. 20. Some microorganisms cause diseases in humans, animals and plants. Examples include cholera, tuberculosis, malaria and citrus canker. Microorganisms also spoil food by producing toxic substances, changing taste and smell, and making food unsafe. Food preservation methods slow or stop their growth.
  21. 21. Electrostatic force.
  22. 22. Kharif crops - paddy and maize; Rabi crops - wheat, gram and pea; Chemical fertilisers - urea and super phosphate; Organic manure - animal excreta, cow dung, urine and plant waste.
Brain Grain · braingrain.in
Science — Practice Paper · Set 2
Class: 8CBSE / NCERTMax Marks: 34
Name: ____________________Reg No: ____________
Part I — Multiple Choice Questions 10 × 1 = 10

Choose the correct answer. (Answer all questions.)

1.Friction on toy car in increasing order on wet marble, dry marble, newspaper and towel isa. wet marble floor, dry marble floor, newspaper and towelb. newspaper, towel, dry marble floor, wet marble floorc. towel, newspaper, dry marble floor, wet marble floord. wet marble floor, dry marble floor, towel, newspaper[1]
2.Which of these cannot be charged easily by friction?a. A plastic scaleb. A copper rodc. An inflated balloond. A woollen cloth[1]
3.When a glass rod is rubbed with silk cloth, the roda. and cloth both acquire positive chargeb. becomes positively charged while cloth becomes negatively chargedc. and cloth both acquire negative charged. becomes negatively charged while cloth becomes positively charged[1]
4.Adolescents should be careful about what they eat becausei. proper diet develops their brainsii. proper diet is needed for rapid body growthiii. adolescents feel hungry all the timeiv. taste buds are well developed[1]
5.Angle of incidence is equal to angle of reflectiona. Alwaysb. Sometimesc. Under special conditionsd. Never[1]
6.The following is an antibiotici. Sodium bicarbonateii. Streptomyciniii. Alcoholiv. Yeast[1]
7.Image formed by a plane mirror isa. virtual, behind mirror and enlargedb. virtual, behind mirror and same sizec. real at surface and enlargedd. real, behind mirror and same size[1]
8.The number of nuclei present in a zygote isi. noneii. oneiii. twoiv. four[1]
9.The bread or idli dough rises because ofi. heatii. grindingiii. growth of yeast cellsiv. kneading[1]
10.Tester bulb glows brightly for liquid A and dimly for liquid B. What follows?i. liquid A is a better conductor than liquid Bii. liquid B is a better conductor than liquid Aiii. both are equally conductingiv. conducting properties cannot be compared[1]
Part II — Short Answer Questions 12 × 2 = 24

Answer briefly. (Answer all questions.)

11.Would soapy water on a marble floor make walking easier or difficult? Why?[2]
12.Explain why fossil fuels are exhaustible natural resources.[2]
13.What is irrigation? Describe two methods of irrigation which conserve water.[2]
14.Prepare a table of endocrine glands and hormones secreted by them.[2]
15.Fill in blanks about plane mirror distance, touching ear in mirror, pupil in dim light and night birds.[2]
16.What will happen if we go on cutting trees?[2]
17.Give examples showing friction is both friend and foe.[2]
18.Why is sliding friction less than static friction?[2]
19.State the laws of reflection.[2]
20.Give two differences between a zygote and a foetus.[2]
21.Indicate True or False for the statements about oviparous animals, sperm, external fertilisation, gamete, egg, Amoeba, asexual reproduction, binary fission, zygote and embryo.[2]
22.Name the unit in which calorific value of a fuel is expressed.[2]
🔑 Show Answer Key — Set 2
  1. 1. (a) wet marble floor, dry marble floor, newspaper and towel.
  2. 2. (b) A copper rod.
  3. 3. (b) becomes positively charged while the cloth becomes negatively charged.
  4. 4. (ii) proper diet is needed for rapid body growth.
  5. 5. (a) Always.
  6. 6. (ii) Streptomycin.
  7. 7. (b) virtual, behind the mirror and of the same size as the object.
  8. 8. (ii) one.
  9. 9. (iii) growth of yeast cells.
  10. 10. (i) liquid A is a better conductor than liquid B.
  11. 11. More difficult, because soap reduces friction and makes the floor slippery.
  12. 12. They are present in limited quantities and take millions of years to form. Human use is much faster than their formation, so they can be exhausted.
  13. 13. Irrigation is supplying water to crops at regular intervals. Sprinkler irrigation sprays water like rain and is useful for uneven land. Drip irrigation supplies water drop by drop near the roots, reducing wastage and evaporation.
  14. 14. Pituitary - growth hormone; thyroid - thyroxine; pancreas - insulin; adrenal glands - adrenaline; testes - testosterone; ovaries - estrogen.
  15. 15. (a) 2 m (b) left, left hand (c) large (d) fewer cones than rods.
  16. 16. There will be loss of biodiversity, soil erosion, reduced rainfall, increase in carbon dioxide, global warming, floods, droughts and desertification.
  17. 17. Friction helps us walk, write, hold objects and stop vehicles using brakes. It is a foe because it causes wear and tear, produces unwanted heat and wastes energy in machines.
  18. 18. Once surfaces start sliding, their contact interlocking is reduced compared with the force needed to start motion.
  19. 19. The angle of incidence equals the angle of reflection. The incident ray, reflected ray and normal at the point of incidence lie in the same plane.
  20. 20. A zygote is the single cell formed by fusion of gametes; a foetus is a later stage with recognisable body parts. The zygote begins division, while the foetus grows in the uterus before birth.
  21. 21. (a) False (b) True (c) True (d) False (e) True (f) False (g) False (h) True (i) True (j) False.
  22. 22. Kilojoule per kilogram (kJ/kg).
Brain Grain · braingrain.in
Science — Practice Paper · Set 3
Class: 8CBSE / NCERTMax Marks: 34
Name: ____________________Reg No: ____________
Part I — Multiple Choice Questions 10 × 1 = 10

Choose the correct answer. (Answer all questions.)

1.Carrier of malaria-causing protozoan isi. female Anopheles mosquitoii. cockroachiii. houseflyiv. butterfly[1]
2.The right meal for adolescents consists ofi. chips, noodles, cokeii. chapati, dal, vegetablesiii. rice, noodles and burgeriv. vegetable cutlets, chips and lemon drink[1]
3.Sound can travel througha. gases onlyb. solids onlyc. liquids onlyd. solids, liquids and gases[1]
4.Arrange rolling, static and sliding frictions in decreasing order.a. rolling, static, slidingb. rolling, sliding, staticc. static, sliding, rollingd. sliding, static, rolling[1]
5.The process of conversion of sugar into alcohol is calledi. nitrogen fixationii. mouldingiii. fermentationiv. infection[1]
6.Internal fertilisation occursi. in female bodyii. outside female bodyiii. in male bodyiv. outside male body[1]
7.Voice of which is likely to have minimum frequency?a. Baby girlb. Baby boyc. A mand. A woman[1]
8.A tadpole develops into an adult frog by the process ofi. fertilisationii. metamorphosisiii. embeddingiv. budding[1]
9.Reproductive age in women starts when theiri. menstruation startsii. breasts start developingiii. body weight increasesiv. height increases[1]
10.Water rises in a dropper after releasing the pressed bulb because ofa. pressure of waterb. gravity of the earthc. shape of rubber bulbd. atmospheric pressure[1]
Part II — Short Answer Questions 12 × 2 = 24

Answer briefly. (Answer all questions.)

11.Draw a labelled sketch of the human eye.[2]
12.Complete the crossword hints: fusion of gametes, fertilisation in hen, bulges in Hydra, eggs produced here, sperm organs, another term for IVF, egg-laying animals, fission in Amoeba.[2]
13.Name two forces acting on a rocket immediately after leaving the launching pad.[2]
14.Explain how you can take care of your eyes.[2]
15.Why do sportsmen use shoes with spikes?[2]
16.Solve the word-game clues for adolescence terms.[2]
17.Fill in the blanks: microorganisms are seen with a ___; blue-green algae fix ___; alcohol is produced with ___; cholera is caused by ___.[2]
18.Define asexual reproduction. Describe two methods of asexual reproduction in animals.[2]
19.Can rusting be called combustion? Discuss.[2]
20.Discuss effects of deforestation on wild animals, environment, rural areas, urban areas, earth and the next generation.[2]
21.How should the power-shortage data from 1991 to 1997 be represented as a graph?[2]
22.Fill in the blanks about conducting liquids, chemical effects, copper sulphate and electroplating.[2]
🔑 Show Answer Key — Set 3
  1. 1. (i) female Anopheles mosquito.
  2. 2. (ii) chapati, dal, vegetables.
  3. 3. (d) solids, liquids and gases.
  4. 4. (c) static, sliding, rolling.
  5. 5. (iii) fermentation.
  6. 6. (i) in female body.
  7. 7. (c) A man.
  8. 8. (ii) metamorphosis.
  9. 9. (i) menstruation starts.
  10. 10. (d) atmospheric pressure.
  11. 11. A labelled eye sketch should show cornea, iris, pupil, lens, retina, optic nerve and eyelids. Light enters through cornea and pupil, is focused by the lens on retina, and signals go through the optic nerve.
  12. 12. Fertilisation; internal; buds; ovary; testes; test-tube baby; oviparous; binary.
  13. 13. Upward thrust from expelled gases and downward gravitational force.
  14. 14. Read in proper light, do not look at the sun or laser, keep books at a comfortable distance, wash eyes with clean water, eat vitamin A rich food, avoid rubbing eyes, and consult an eye specialist if there is difficulty in seeing.
  15. 15. Spikes increase friction with the ground and give better grip.
  16. 16. Across: Adam's apple, endocrine, pituitary, hormones, insulin, estrogen. Down: testosterone, thyroid, adolescence, target site, larynx, puberty.
  17. 17. Microscope; nitrogen; yeast; bacteria (Vibrio cholerae).
  18. 18. Asexual reproduction produces new individuals from one parent without fusion of gametes. In binary fission, Amoeba divides into two daughter cells. In budding, a bud grows on the parent, as in Hydra, and develops into a new individual.
  19. 19. Rusting is a slow oxidation process but not combustion in the usual sense because it does not produce heat and light rapidly like burning.
  20. 20. Deforestation destroys habitats, reduces rainfall, increases temperature and carbon dioxide, causes soil erosion, floods and droughts, reduces groundwater and biodiversity, and leaves fewer resources and a degraded environment for future generations.
  21. 21. Draw a line graph with year on the x-axis and shortage percentage on the y-axis. Plot the points (1991, 7.9), (1992, 7.8), (1993, 8.3), (1994, 7.4), (1995, 7.1), (1996, 9.2), (1997, 11.5) and join them.
  22. 22. (a) acids, bases and salts (b) chemical (c) negative (d) electroplating.

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Class 8 does not have a public board examination, so there are no official board question papers for this class. The papers above are Brain Grain practice papers built to the standard exam pattern — ideal for unit tests, monthly tests and revision.

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