8th Class Science Sample Paper

done Science Sample Paper-4 Total Questions - 37    [Download]

• question_answer1)

  Choose the correct option:

  (i) The passage of an electric current through a conducting liquid causes:

  A)
  Heating effects of current
  done clear
  B)
  Magnetic effects of current
  done clear
  C)
  Chemical effects of current
  done clear
  D)
  Electric effects of current
  done clear
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• question_answer2)

  Choose the correct option:

  (ii) Angle of incidence is equal to the angle of reflection:

  A)
  always     
  done clear
  B)
  sometimes
  done clear
  C)
  under special conditions    
  done clear
  D)
  never
  done clear
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• question_answer3)

  Choose the correct option:

  (iii) An agricultural implement used since ancient times for tilling the soil, adding fertilisers, removing weeds etc. is:

  A)
  hoe                  
  done clear
  B)
                     combine
  done clear
  C)
  plough      
  done clear
  D)
                     seed drill
  done clear
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• question_answer4)

  Choose the correct option:

  (iv) Carrier of malaria - causing protozoan is:

  A)
  Female anopheles mosquito
  done clear
  B)
  Cockroach
  done clear
  C)
  Housefly             
  done clear
  D)
      Butterfly
  done clear
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• question_answer5)

  Choose the correct option:

  (v) This bacterium promotes the formation of milk into curd

  A)
  Rhizobium          
  done clear
  B)
                     Lactobacillus
  done clear
  C)
  Aedes               
  done clear
  D)
                     All
  done clear
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• question_answer6)

  Choose the correct option:

  (vi) Which is not made from nylon?

  A)
  Socks                 
  done clear
  B)
                     Rope
  done clear
  C)
  Bottles   
  done clear
  D)
                     Tents
  done clear
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• question_answer7)

  Choose the correct option:

  (vii) Some metals react with bases to produce gas

  A)
  Oxygen              
  done clear
  B)
                     Nitrogen
  done clear
  C)
  Hydrogen     
  done clear
  D)
                    Carbon dioxide
  done clear
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• question_answer8)

  Choose the correct option:

  (viii) Which is not an exhaustible natural resource?

  A)
  Sunlight       
  done clear
  B)
                     Petroleum
  done clear
  C)
  Natural gas         
  done clear
  D)
                     Wildlife
  done clear
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• question_answer9)

  Choose the correct option:

  (ix) Which of the following is not a combustible substance?

  A)
  Camphor        
  done clear
  B)
                     Straw
  done clear
  C)
  Glass
  done clear
  D)
                    Charcoal
  done clear
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• question_answer10)

  Choose the correct option:

  (x) In our country, large patches of forests are being cleared for cultivation of crops. The environmental impact of such a practice will lead to:

  A)
  Soil erosion        
  done clear
  B)
                     Soil pollution
  done clear
  C)
  Soil conservation
  done clear
  D)
                     Soil fertility
  done clear
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• question_answer11)
  (i) How could a single cell becomes such a big individual?                                                                           
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• question_answer12)
  (ii) Name the male sex hormone.                                                                                                                                                
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• question_answer13)
  (iii) Give two examples of situation in which applied force causes a change in shape of an object.                    
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• question_answer14)
                                                                                                  (iv) How many types of friction are there?     
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• question_answer15)
  (v) Which animal can hear sounds of frequencies higher than 20,000 Hz?    
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• question_answer16)
  (vi) What is electric current?
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• question_answer17)
                          A stretched string on being set into vibrations produces the audible sound. Explain how?    
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• question_answer18)
  An electric current is passed through a conducting solution. List any three possible observations.           
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• question_answer19)
              Lightning and thunder takes place simultaneously in sky and at the same distance from us. Lightning is seen earlier and thunder is heard later. Why?  
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• question_answer20)
                                                                                      Name the factors that affect friction.   
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• question_answer21)
                                                                                                                                                              Why are little plants kept in small bags in a nursery?       
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• question_answer22)
                                                  How can a farmer increase the fertility of the soil?         
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• question_answer23)
                       How food becomes poisonous?    
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• question_answer24)
                                                                                                                                                       Should antibiotics be used in cold and flu? Give reasons for your answer.    
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• question_answer25)
  PVC (Polyvinyl Chloride) is a thermoplastic and is used for making toys, chappals etc. Bakelite is thermosetting plastic and is used for making electrical switches, handles of various utensils etc. Can you write the major difference between these two types of plastics?        
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• question_answer26)
  Immersion rods are made up of metallic substances. Why?     
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• question_answer27)
  Give reason: Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.               
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• question_answer28)
  What is poaching? How does poaching affect environment and humans?                  
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• question_answer29)
  The size of the cells of an organism has no relation with the size of its body. Do you agree? Give reasons           
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• question_answer30)
                                                 

  (a) All the metals are malleable and ductile except few. Which are those metals (neither malleable nor ductile).

  (b) Metals are used for making electric wires. Name at least one metal and why these metals are used in making electric wires.

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• question_answer31)

  Give reason:

  Treaded tyres are used in cars, trucks and bulldozers

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• question_answer32)
  How vaccine works?
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• question_answer33)
                Explain the process of formation of petroleum.
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• question_answer34)
                                                            

  Write a short note on:

  (i) Useful micro-organisms.

  (ii) Harmful micro-organisms.

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• question_answer35)
  Explain the difference between the thermoplastics and thermosetting plastics. 
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• question_answer36)
                                                  Discuss all the chemical properties of (a) Metals and (b) Non-metals.   
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• question_answer37)
                                                  Make a sketch of the human nerve cell. What functions do nerve cells do?    
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