Sample Papers - 7, Science, Class 8 Class 8 Notes | EduRev

Science Class 8

Created by: Manju Sen

Class 8 : Sample Papers - 7, Science, Class 8 Class 8 Notes | EduRev

 Page 1


(1/3) 
 
SCIENCE 
 Class VIII  
General Instructions : 
• Read the question paper carefully. 
• Draw neat and labelled diagrams wherever necessary 
• Attempt the questions in serial order. 
 
Q.1 Choose the correct option in each of the following. (1×6=6) 
 i) Sperms collect and mature in the –  
  a) epididymis b) vas deferens  
  c) scrotal sac d) testes  
 ii) Which one of the following is a natural fibre?  
  a) polyester b) nylon  
  c) cellulose d) acrylic  
 iii) The electrode, connected to the negative terminal of a battery is -  
  a) anode b) cathode  
  c) electrolyte d) can’t say  
 iv) When the angle between the two mirrors is 90
0
, the number of images 
formed will be - 
 
  a) 3 b) 2  
  c) 1 d) 5  
 v) Natural gas is used to produce -  
  a) coke b) carbon black  
  c) biodiesel d) coal tar  
 vi) Which one of the following effects the ozone layer?  
  a) carbon dioxide b) soot  
  c) CFCs d) dust  
Q.2 Complete the following sentences. (1×6=6) 
 i) ________ is the stage of attaining sexual maturity in males and females. 
ii) ________ fibres compete with wool. 
iii) The main constituent of coal is ________. 
iv) The kaleidoscope is a device that uses ________ to produce patterns. 
v) The process by which the carbon content of coal increases is called ________ . 
vi) Protecting wildlife in its natural surrounding is called ________ conservation. 
 
Q.3 Answer the following in one word. (1×6=6) 
 i) The process of formation of a polymer from its monomer ________. 
ii) The gas collected over petroleum in a petroleum well ________. 
iii) The most polluted river of the country ________. 
 
Page 2


(1/3) 
 
SCIENCE 
 Class VIII  
General Instructions : 
• Read the question paper carefully. 
• Draw neat and labelled diagrams wherever necessary 
• Attempt the questions in serial order. 
 
Q.1 Choose the correct option in each of the following. (1×6=6) 
 i) Sperms collect and mature in the –  
  a) epididymis b) vas deferens  
  c) scrotal sac d) testes  
 ii) Which one of the following is a natural fibre?  
  a) polyester b) nylon  
  c) cellulose d) acrylic  
 iii) The electrode, connected to the negative terminal of a battery is -  
  a) anode b) cathode  
  c) electrolyte d) can’t say  
 iv) When the angle between the two mirrors is 90
0
, the number of images 
formed will be - 
 
  a) 3 b) 2  
  c) 1 d) 5  
 v) Natural gas is used to produce -  
  a) coke b) carbon black  
  c) biodiesel d) coal tar  
 vi) Which one of the following effects the ozone layer?  
  a) carbon dioxide b) soot  
  c) CFCs d) dust  
Q.2 Complete the following sentences. (1×6=6) 
 i) ________ is the stage of attaining sexual maturity in males and females. 
ii) ________ fibres compete with wool. 
iii) The main constituent of coal is ________. 
iv) The kaleidoscope is a device that uses ________ to produce patterns. 
v) The process by which the carbon content of coal increases is called ________ . 
vi) Protecting wildlife in its natural surrounding is called ________ conservation. 
 
Q.3 Answer the following in one word. (1×6=6) 
 i) The process of formation of a polymer from its monomer ________. 
ii) The gas collected over petroleum in a petroleum well ________. 
iii) The most polluted river of the country ________. 
 
(2/3) 
iv) The phenomenon of splitting of light into its component colours on 
refraction ________. 
v) Natural fountains of hot water and stream often used to generate electricity 
________. 
vi) The plants / animals that do not belong to a place originally and are 
introduced from elsewhere ________. 
Q.4 Give reasons for the following. (any three) (2×3=6) 
 i) Acrylics are not spun from the melt. 
ii) A log of wood takes longer time to start burning than the wood shavings. 
iii) Metals are good conductor of heat. 
iv) The image formed on a metal surface is hazy as compared to the image 
formed on a mirror. 
 
Q.5 Define the following terms (any five). (2×5=10) 
 i) Asexual reproduction ii) Foeticide 
iii) Electrolyte   iv) Accomodation 
v) Biomass energy  vi) Endangered species 
vii) Ignition temperature 
 
Q.6 Draw and label of the following (any two). (3×2=6) 
 i) Female reproductive system 
ii) Electroplating of spoon with silver 
iii) Operations at waterworks / large scale purification of water. 
iv) Fractional distillation of petroleum. 
 
Q.7 Answer the following in not more than 20 words. (any six) (2×6=12) 
 i) Write any two advantages and two disadvantages of synthetic fibres. 
ii) What is an ion ? Give two examples of it. 
iii) What is lateral inversion? 
iv) Name any four alternative sources of energy that can be used for the 
generation of electricity. 
v) What is potable water? Write any two properties of it. 
vi) What does ‘sustainable utilization’ of natural resources mean? 
vii) What is wildlife? What to you understand by Joint Forest Management? 
viii) Why are coal, petroleum and natural gas called fossil fuel? 
 
Q.8 Answer the following in not more than 40 words. (any six) (3×6=18) 
 i) How are twins born? 
ii) What is biogas and how does it burn? 
iii) What happens when voltage is applied across electrodes placed in an 
electrolyte? 
iv) What do you understand by the blind spot of the eye? 
 
Page 3


(1/3) 
 
SCIENCE 
 Class VIII  
General Instructions : 
• Read the question paper carefully. 
• Draw neat and labelled diagrams wherever necessary 
• Attempt the questions in serial order. 
 
Q.1 Choose the correct option in each of the following. (1×6=6) 
 i) Sperms collect and mature in the –  
  a) epididymis b) vas deferens  
  c) scrotal sac d) testes  
 ii) Which one of the following is a natural fibre?  
  a) polyester b) nylon  
  c) cellulose d) acrylic  
 iii) The electrode, connected to the negative terminal of a battery is -  
  a) anode b) cathode  
  c) electrolyte d) can’t say  
 iv) When the angle between the two mirrors is 90
0
, the number of images 
formed will be - 
 
  a) 3 b) 2  
  c) 1 d) 5  
 v) Natural gas is used to produce -  
  a) coke b) carbon black  
  c) biodiesel d) coal tar  
 vi) Which one of the following effects the ozone layer?  
  a) carbon dioxide b) soot  
  c) CFCs d) dust  
Q.2 Complete the following sentences. (1×6=6) 
 i) ________ is the stage of attaining sexual maturity in males and females. 
ii) ________ fibres compete with wool. 
iii) The main constituent of coal is ________. 
iv) The kaleidoscope is a device that uses ________ to produce patterns. 
v) The process by which the carbon content of coal increases is called ________ . 
vi) Protecting wildlife in its natural surrounding is called ________ conservation. 
 
Q.3 Answer the following in one word. (1×6=6) 
 i) The process of formation of a polymer from its monomer ________. 
ii) The gas collected over petroleum in a petroleum well ________. 
iii) The most polluted river of the country ________. 
 
(2/3) 
iv) The phenomenon of splitting of light into its component colours on 
refraction ________. 
v) Natural fountains of hot water and stream often used to generate electricity 
________. 
vi) The plants / animals that do not belong to a place originally and are 
introduced from elsewhere ________. 
Q.4 Give reasons for the following. (any three) (2×3=6) 
 i) Acrylics are not spun from the melt. 
ii) A log of wood takes longer time to start burning than the wood shavings. 
iii) Metals are good conductor of heat. 
iv) The image formed on a metal surface is hazy as compared to the image 
formed on a mirror. 
 
Q.5 Define the following terms (any five). (2×5=10) 
 i) Asexual reproduction ii) Foeticide 
iii) Electrolyte   iv) Accomodation 
v) Biomass energy  vi) Endangered species 
vii) Ignition temperature 
 
Q.6 Draw and label of the following (any two). (3×2=6) 
 i) Female reproductive system 
ii) Electroplating of spoon with silver 
iii) Operations at waterworks / large scale purification of water. 
iv) Fractional distillation of petroleum. 
 
Q.7 Answer the following in not more than 20 words. (any six) (2×6=12) 
 i) Write any two advantages and two disadvantages of synthetic fibres. 
ii) What is an ion ? Give two examples of it. 
iii) What is lateral inversion? 
iv) Name any four alternative sources of energy that can be used for the 
generation of electricity. 
v) What is potable water? Write any two properties of it. 
vi) What does ‘sustainable utilization’ of natural resources mean? 
vii) What is wildlife? What to you understand by Joint Forest Management? 
viii) Why are coal, petroleum and natural gas called fossil fuel? 
 
Q.8 Answer the following in not more than 40 words. (any six) (3×6=18) 
 i) How are twins born? 
ii) What is biogas and how does it burn? 
iii) What happens when voltage is applied across electrodes placed in an 
electrolyte? 
iv) What do you understand by the blind spot of the eye? 
 
(3/3) 
v) Describe any three methods of preventing water pollution. 
vi) Name three special projects launched to protect (particular) endangered 
animals in India. Write their locations (states) too. 
vii) What is monoculture? What is the danger linked to this practice? 
Q.9 Answer the following in not more than 100 words. (any five) 
(5×5=25) 
 i) How is the sex of a foetus determined? Why is it prohibited by law? 
ii) Write any five factors which should be considered while choosing a fuel. 
iii) What is Electrolysis? Explain the process of electrolysis of water using chemical 
equations. 
iv)  a) State the laws of reflection. 
 b) Mention any three vision related problems and their possible causes. 
v)  a) Describe Eutrophication. 
 b) What is acid rain? Mention any two effects of it. 
vi) What are secondary sexual characters? Mention the male and female secondary 
 sexual characters in human being.  
Q.10 Carefully observe the diagram given below and answer the following questions. 
 
 
HUMAN EYE 
 
 a) Label the given points (a, b, c, d, e, f) of the diagram. (3) 
 b) Name the protective membrane of eye which covers most of the eye  ball. (1) 
 c) What is the function of ‘suspensory ligament’? (1) 
 
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