Class 8 Science: CBSE Sample Question Paper - 5 | Sample Papers For Class 8 PDF Download

 Page 1


 
 
 
 
CLASS: VIII SCIENCE 
 
 
 
  
 
 
 
1. What happens when you hammer 
i. a metal  ii. a non-metal  (I) 
2. What would you observe  when a strip of zinc is dipped in the solution of copper  sulphate?  (I) 
3. Identify  the following metals  that: 
(a) replaces silver  from silver  nitrate  solution. 
(b) bums in oxygen  with a bright white  light.                                                                                        (I ) 
4.  What is audible range  for human  ear?  (I ) 
5.  What is meant by echo?  (I) 
6. Take a pot and put polythene bags, empty  glass bottles  and  broken  plastic  toys.  What  will you  observe  after 
some  time? Give reason.  ( I ) 
 
7. How does sowing  by seed drill ensure  better growth of crops?  
(I)
 
 
8. Give reasons: 
(a) The handles of screw  drivers  made up of plastics.                                                                         (I ) 
(b) We should  not wear synthetic  clothes  while working  with fire in the kitchen.                         (I) 
(c)  It is better to keep anima Is in the wildlife sanctuary  than at zoo.                                               ( I ) 
(d) Fishes and  birds migrate every  year.                                                                                               (I) 
(e) Rollers  are used for transporting luggage.                                                                                       (I) 
(f) Talcum  powder  is put on a carom  board before a game.                                                               (I ) 
(g) School  bags have wide straps.                                                                                                           (I ) 
(h) Houseflies and cockroaches are not the causative  agent  of any disease.  Yet we are advised  to 
keep them away from our food. 
.. 
( I  )
 
(i) Polyester  is quite suitable  for making dress materials.                                                                   (I l 
G) Ringing  bells in temples  are made of metal.                                                                                    !I) 
(k) If you put one end of a metal  in hot water, you feel hot at the other end.                                 (I ) 
0) Foodstuffs with  acid components should not be stored  in metallic  containers.                      (I) 
(m) Tincture of iodine  is applied  on wounds.                                                                                       (I ) 
(n) Iron is used in constructing bridges and houses.                                                                            (I) 
9. What is the chemical  nature of polyester? What are polycot and polywool?                                            12) 
IO. You must have heard a slogan  "Say_ no to plastics". Give two reason  in support  of this practice.             (2) 
ll. Differentiate  between: 
(a) Biodegradable and non-biodegradable materials 
(b) Thermosetting plastics  and Thermoplastics                                                                              1 
12. One day Meera  went to a jewel er ’s shop  with her mother.  Her mother  gave an old jewellery  to the 
goldsmith to polish. Next day when  they brought  the jewellery  back, they found  that there was a slight  loss inits 
weight.  What is the reason  behind  the loss in weight?  t .2) 
13. The sound of thunder is heard  after few seconds  to the flash of lightning. Explain  the statement to  
support your answer.                                                                                                                                                                   
1 :2 l 
Page 2


 
 
 
 
CLASS: VIII SCIENCE 
 
 
 
  
 
 
 
1. What happens when you hammer 
i. a metal  ii. a non-metal  (I) 
2. What would you observe  when a strip of zinc is dipped in the solution of copper  sulphate?  (I) 
3. Identify  the following metals  that: 
(a) replaces silver  from silver  nitrate  solution. 
(b) bums in oxygen  with a bright white  light.                                                                                        (I ) 
4.  What is audible range  for human  ear?  (I ) 
5.  What is meant by echo?  (I) 
6. Take a pot and put polythene bags, empty  glass bottles  and  broken  plastic  toys.  What  will you  observe  after 
some  time? Give reason.  ( I ) 
 
7. How does sowing  by seed drill ensure  better growth of crops?  
(I)
 
 
8. Give reasons: 
(a) The handles of screw  drivers  made up of plastics.                                                                         (I ) 
(b) We should  not wear synthetic  clothes  while working  with fire in the kitchen.                         (I) 
(c)  It is better to keep anima Is in the wildlife sanctuary  than at zoo.                                               ( I ) 
(d) Fishes and  birds migrate every  year.                                                                                               (I) 
(e) Rollers  are used for transporting luggage.                                                                                       (I) 
(f) Talcum  powder  is put on a carom  board before a game.                                                               (I ) 
(g) School  bags have wide straps.                                                                                                           (I ) 
(h) Houseflies and cockroaches are not the causative  agent  of any disease.  Yet we are advised  to 
keep them away from our food. 
.. 
( I  )
 
(i) Polyester  is quite suitable  for making dress materials.                                                                   (I l 
G) Ringing  bells in temples  are made of metal.                                                                                    !I) 
(k) If you put one end of a metal  in hot water, you feel hot at the other end.                                 (I ) 
0) Foodstuffs with  acid components should not be stored  in metallic  containers.                      (I) 
(m) Tincture of iodine  is applied  on wounds.                                                                                       (I ) 
(n) Iron is used in constructing bridges and houses.                                                                            (I) 
9. What is the chemical  nature of polyester? What are polycot and polywool?                                            12) 
IO. You must have heard a slogan  "Say_ no to plastics". Give two reason  in support  of this practice.             (2) 
ll. Differentiate  between: 
(a) Biodegradable and non-biodegradable materials 
(b) Thermosetting plastics  and Thermoplastics                                                                              1 
12. One day Meera  went to a jewel er ’s shop  with her mother.  Her mother  gave an old jewellery  to the 
goldsmith to polish. Next day when  they brought  the jewellery  back, they found  that there was a slight  loss inits 
weight.  What is the reason  behind  the loss in weight?  t .2) 
13. The sound of thunder is heard  after few seconds  to the flash of lightning. Explain  the statement to  
support your answer.                                                                                                                                                                   
1 :2 l 
14. On a hot summer day, a little mosquito produces  buzzing sound near your ear at a rate of about 3000 wings 
beats per five seconds. What is the frequency,  in hertz of this sound?  (2) 
 
15. Give two examples  to explain that friction  is a necessary  evil. 
 
16. What do you understand  by rusting? How can you prevent this process? 
 
(2) 
 
(2) 
 
17. Shyam took a piece of burning charcoal and collected the gas evolved in a test tube: 
(a) How will he find the nature of the gas? 
(b) Write down the word equation of all the reactions taking place in this process.  (2) 
18. Calculate the pressure exerted on a cuboid of 4x3m dimensions  placed on the ground  when force applied on 
ground is 60N.  (2) 
 
.· 19. Identify the part which  produce sound in the following  instruments: 
 
a)   Dholak 
b)  Flute 
c) Sitar 
d) Guitar  (2) 
 
20. Why objects moving through fluids are given a special  shape? What is the name given  to these special 
shapes?  (2) 
 
20. A funner  planted three crops in pots A,B and C. He applied  cow dung to pot A, Urea to Pot Band 
nothing to Pot C for a week. What will he observe after a week? Why?  (2) 
' 21. Endemic species are more prone to extinction  than non endemic  species. Justify the statement.  (2) 
 
22.  (a) Why milk is instantly cooled after boiling during pasteurization? 
 
(b)  Name the preservative  used in i) jams and jellies  ii) pickles  (2) 
 
23.  Why do mountaineers  suffer ·nose bleeding when they move towards higher altitude?  (2) 
24. Compare the properties of metals and non-metals  with respect to 
(a) Formation of oxide 
(b) Conductivity 
(c) Ductility  (3) 
25. How  does the amount of nitrogen remain constant in atmosphere?  Explain  with the help of a flowchart.(3) 
 
26. What is the impact of deforestation  on  a) environment b) urban
..
areas? 
27. State any three changes that a force brings about on a body. Give one example of each. 
 
28.  (a) Why is water essential  for plants? 
 
(b) In what way traditional  methods of irrigation  are different from modem  methods? 
(3) 
 
(3) 
 
(c) Explain any one modem method of irrigation  which conserves water?  (2+ I +2=5) 
 
29. How are microorganisms  useful in 
 
a) agriculture b) medicine 
 
c) kitchen 
 
e) industries 
 
d) environment 
 
 
 
(5) 
 
0. What is electroplating?  How are steel spoons  plated with silver? Explain with the help of a diagram.(5) 
Page 3


 
 
 
 
CLASS: VIII SCIENCE 
 
 
 
  
 
 
 
1. What happens when you hammer 
i. a metal  ii. a non-metal  (I) 
2. What would you observe  when a strip of zinc is dipped in the solution of copper  sulphate?  (I) 
3. Identify  the following metals  that: 
(a) replaces silver  from silver  nitrate  solution. 
(b) bums in oxygen  with a bright white  light.                                                                                        (I ) 
4.  What is audible range  for human  ear?  (I ) 
5.  What is meant by echo?  (I) 
6. Take a pot and put polythene bags, empty  glass bottles  and  broken  plastic  toys.  What  will you  observe  after 
some  time? Give reason.  ( I ) 
 
7. How does sowing  by seed drill ensure  better growth of crops?  
(I)
 
 
8. Give reasons: 
(a) The handles of screw  drivers  made up of plastics.                                                                         (I ) 
(b) We should  not wear synthetic  clothes  while working  with fire in the kitchen.                         (I) 
(c)  It is better to keep anima Is in the wildlife sanctuary  than at zoo.                                               ( I ) 
(d) Fishes and  birds migrate every  year.                                                                                               (I) 
(e) Rollers  are used for transporting luggage.                                                                                       (I) 
(f) Talcum  powder  is put on a carom  board before a game.                                                               (I ) 
(g) School  bags have wide straps.                                                                                                           (I ) 
(h) Houseflies and cockroaches are not the causative  agent  of any disease.  Yet we are advised  to 
keep them away from our food. 
.. 
( I  )
 
(i) Polyester  is quite suitable  for making dress materials.                                                                   (I l 
G) Ringing  bells in temples  are made of metal.                                                                                    !I) 
(k) If you put one end of a metal  in hot water, you feel hot at the other end.                                 (I ) 
0) Foodstuffs with  acid components should not be stored  in metallic  containers.                      (I) 
(m) Tincture of iodine  is applied  on wounds.                                                                                       (I ) 
(n) Iron is used in constructing bridges and houses.                                                                            (I) 
9. What is the chemical  nature of polyester? What are polycot and polywool?                                            12) 
IO. You must have heard a slogan  "Say_ no to plastics". Give two reason  in support  of this practice.             (2) 
ll. Differentiate  between: 
(a) Biodegradable and non-biodegradable materials 
(b) Thermosetting plastics  and Thermoplastics                                                                              1 
12. One day Meera  went to a jewel er ’s shop  with her mother.  Her mother  gave an old jewellery  to the 
goldsmith to polish. Next day when  they brought  the jewellery  back, they found  that there was a slight  loss inits 
weight.  What is the reason  behind  the loss in weight?  t .2) 
13. The sound of thunder is heard  after few seconds  to the flash of lightning. Explain  the statement to  
support your answer.                                                                                                                                                                   
1 :2 l 
14. On a hot summer day, a little mosquito produces  buzzing sound near your ear at a rate of about 3000 wings 
beats per five seconds. What is the frequency,  in hertz of this sound?  (2) 
 
15. Give two examples  to explain that friction  is a necessary  evil. 
 
16. What do you understand  by rusting? How can you prevent this process? 
 
(2) 
 
(2) 
 
17. Shyam took a piece of burning charcoal and collected the gas evolved in a test tube: 
(a) How will he find the nature of the gas? 
(b) Write down the word equation of all the reactions taking place in this process.  (2) 
18. Calculate the pressure exerted on a cuboid of 4x3m dimensions  placed on the ground  when force applied on 
ground is 60N.  (2) 
 
.· 19. Identify the part which  produce sound in the following  instruments: 
 
a)   Dholak 
b)  Flute 
c) Sitar 
d) Guitar  (2) 
 
20. Why objects moving through fluids are given a special  shape? What is the name given  to these special 
shapes?  (2) 
 
20. A funner  planted three crops in pots A,B and C. He applied  cow dung to pot A, Urea to Pot Band 
nothing to Pot C for a week. What will he observe after a week? Why?  (2) 
' 21. Endemic species are more prone to extinction  than non endemic  species. Justify the statement.  (2) 
 
22.  (a) Why milk is instantly cooled after boiling during pasteurization? 
 
(b)  Name the preservative  used in i) jams and jellies  ii) pickles  (2) 
 
23.  Why do mountaineers  suffer ·nose bleeding when they move towards higher altitude?  (2) 
24. Compare the properties of metals and non-metals  with respect to 
(a) Formation of oxide 
(b) Conductivity 
(c) Ductility  (3) 
25. How  does the amount of nitrogen remain constant in atmosphere?  Explain  with the help of a flowchart.(3) 
 
26. What is the impact of deforestation  on  a) environment b) urban
..
areas? 
27. State any three changes that a force brings about on a body. Give one example of each. 
 
28.  (a) Why is water essential  for plants? 
 
(b) In what way traditional  methods of irrigation  are different from modem  methods? 
(3) 
 
(3) 
 
(c) Explain any one modem method of irrigation  which conserves water?  (2+ I +2=5) 
 
29. How are microorganisms  useful in 
 
a) agriculture b) medicine 
 
c) kitchen 
 
e) industries 
 
d) environment 
 
 
 
(5) 
 
0. What is electroplating?  How are steel spoons  plated with silver? Explain with the help of a diagram.(5) 
 
 
 
CLASS: VIII SCIENCE 
 
 
1.  Which one of the following  is a good conductor of electricity? 
A. Iron B. Plastic 
C. Wood  D. Glass 
2. Sodium metal is stored in 
A. Water B. Alcohol 
C. Kerosene  D. Ether 
3.   Which fibre is also known as regenerated  fibre? 
A. Acrylic  B. Polyester 
C. Rayon  D. Nylon 
4. The energy required to overcome friction is mainly converted into 
 
A. Sound energy  B. Heat energy 
 
 
 
 
 
 
 
 
C. Light energy D. Chemical energy 
 
5. A batsman hits a cricket ball which then rolls on the level ground. After covering  a short distance the ball 
comes to rest. The ball stops due to 
 
A. Magnetic force  B. Frictional force 
 
C. Gravitational force  D. Muscular force 
 
6. Sound can propagate through 
 
A. Vacuum as well as gases  B. Only through gases and liquids 
 
C. Onl y through gases and solids D. Any of the three states of matter 
 
7. Which out of the following does not conduct electricity? 
 
A. Copper 
 
C. Dilute sulphuric acid 
B. Alcohol 
 
D. Vinegar 
 
8. Which of the following reproduce  only inside a host cell? 
 
A. Bacteria  B. Virus 
 
C. Fungi  D. Protozoa. 
 
9. Which of the following is not true for organic manure? 
 
A. It enhances water holding capacity of soil 
 
C. It provides humus to soil. 
B. It has a balance of all plant nutrients. 
 
D. It improves texture of soil. 
 
I0. What do black buck, elephant, python and golden cat together represent in a forest? 
 
A. Flora B. Fauna 
 
C. Ecosystem  D. Species