CBSE Class 8 Science Sample Paper Set 27

CBSE Class 8 Science Sample Paper Set A. It’s always recommended to practice as many CBSE sample papers as possible before the examinations. The latest sample papers have been designed as per the latest blue prints, syllabus and examination trends. Sample papers should be practiced in examination condition at home or school and also show it to your teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

PHYSICS

1. The pole star is in the constellation of 

a) Ursa Major b) Ursa minor c) Orion d) Scorpios

2. In which of these current is not due to flow of electrons? 

a) Copper b) Aluminum c) Tap Water d) Mercury

3. A body can be charged by 

a) Rubbing it against another body b) Touching it to a charged body

c) Bringing a charged body near it d) All of the above methods.

4. The gold leaf electroscope can be used to 

a) detect charge only.

a) detect and measure charge only.

b) detect, measure and find the nature of charge.

c) None of the above.

5. Sound of which of the following frequency can you hear 

a) 5 Hz b) 15 Hz c) 500 Hz d) 50000 Hz

6. An object vibrates with a frequency of 15 Hz. Which of the following is true? 

a) It produces sound which we can hear.

b) It does not produce sound.

c) It produces sound which we cannot hear.

d) It produces sound which we can hear if we strain our ears.

7. Differentiate between infrasonic and ultra sonic sound. 

8. a) Distilled water does not conduct electricity but tap water does conduct electricity. Why?

b) With the help of a diagram show each component of a closed circuit. 

9. a) What is Richter scale?

b) Why does a comb rubbed on hair attract pieces of paper? 

10. a) In which of the following the speed of sound is minimum? Air, water and steel.

b) Why do we hear the sound of thunder few seconds after we saw the lightning?

c) Calculate the minimum distance (between the source and the reflector) required to hear an echo of the sound produced by a girl. (Given that speed of sound in air is 340m/s). (3)

11. a) Which comet can be seen after every 76 years?
      b) Which satellite was sent first into space by India?
      c) What are the differences between meteor and meteorite? (Any two) (3)

12. a) Why is mercury very hot during the day and very cold at night?
     b) Explain why pole star appears to be stationary in the sky and all other stars appear to revolve around it from east to west? (3)

13. a) What do you mean by noise?
     b) Write two main causes of noise pollution.
     c) Give two methods to control noise pollution in your locality. (1+2+2)

14. a) What is meant by earthing?
     b) Explain how lightning occurs between two clouds during a thunder storm.
     c) Draw a neat and well labeled diagram of a Gold leaf electroscope.

CHEMISTRY

1. Which of the following alloys is used to make electric heaters and resistors?
a) Brass        b) Stainless steel
c) Duralium   d) German Silver (1)

2. Which of these is not obtained by refining of petroleum?
a) LPG     b) CNG      c) Diesel   d) Petrol (1)

3. Which of the following is regarded as the best quality of coal?
a) Bituminous    b) Lignite
c) Anthracite     d) Peat (1)

4. Which of these is a solid pollutant?
a) SPM                   b) Carbon monoxide
c) Nitrogen oxides   d) Sulphur dioxide (1)

5. Which of the following is not a product of complete combustion of methane?
a) Water       b) Coke       c) Carbon dioxide      d) Energy(1)

6. Which of these is not a pollutant unless present in excess?
a) Sulphur dioxide        b) Carbon dioxide
c) Carbon monoxide     d) Nitrogen dioxide (1)

7. a) Give an example of an inflammable substance.
    b) Define: Calorific value.

8. a) Why carbon monoxide is considered to be a dangerous pollutant?
    b) Complete and balance the following equations:

i) Na + O₂→ ii) Al + HCl → (1+1)

9. Draw a neat and well labelled diagram of a candle flame. (2)

10. a) What is the colour and name of the compound formed due to corrosion of copper metal?
     b) With the help of an activity show that both air and moisture are necessary for rusting of iron to take place. (1+2)

11. a) What is the meaning of the word conservation of resources?
     b) Give two reasons as to why we need to conserve our natural resources. (1+2)

12. a) What is the composition of water gas?
     b) How is coke obtained?
     c) Give one use of:
       i) Coal tar     ii) Ammonium compounds
    d) Define: Destructive Distillation Of Coal. (½+½+1+1)

13. a) How is petroleum formed?
     b) What do you mean by
         i) refining?     ii) fractions?
    c) Why petroleum is called black gold?
    d) Write the names and one use of the products obtained from fractional distillation of the residual oil. (any two) (1+1+1+2)

14. a) What are the conditions necessary for combustion to take place (three)?
     b) List any three characteristics of a good fuel.
     c) Which zone of the candle flame is the hottest and why?
     d) Write the working of Acid-Soda type of fire extinguisher. Write down the balanced chemical equation involved. (1+1+1+2)

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