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

 Page 1


 
 
CLASS VIII 
SCIENCE 
 
GENERAL INSTRUCTIONS: 
(1) The question paper comprises of two sections A and B . You have to attempt both the 
sections.  
(2) All questions are compulsory. 
(3) Question number 1 to 5 are very short answer type questions. Each question carries 1 
mark. 
(4) Question number 6 to 12 are short answer type questions. Each question carries 2 marks. 
(5) Question number 13 to 19 are also short type questions. Each question carries 3 marks. 
(6)  Question number 20 to 22 are long answer type question. Each question carries 5 marks. 
(7)  Question number 23 to 27are Multiple Choice Questions. Each question carries 1 mark. 
                                                  SECTION -A 
Q1. What is cutting of mature plants called?   
Ans1- Harvesting. 
Q2. What is the term given to lowest temperature at which a substance burns.   
Ans2 – Ignition temperature  
Q3. Define Deforestation.    
Ans3- Clearing of forests /trees   and using the land for other purposes. 
Q4. Name the process of reproduction in hydra.     
Ans 4- Budding.  
Q5. Name the device used to test whether an object is carrying a charge or not.   
Ans5- Electroscope. 
Q6. What is carbonization?        
Ans6 – Carbonisation is the Slow process of Formation of coal from dead vegetation,under 
high temperature, pressure and absence of oxygen.  
Q7. Draw a well labelled diagram of a candle flame.    
Ans7  
Page 2


 
 
CLASS VIII 
SCIENCE 
 
GENERAL INSTRUCTIONS: 
(1) The question paper comprises of two sections A and B . You have to attempt both the 
sections.  
(2) All questions are compulsory. 
(3) Question number 1 to 5 are very short answer type questions. Each question carries 1 
mark. 
(4) Question number 6 to 12 are short answer type questions. Each question carries 2 marks. 
(5) Question number 13 to 19 are also short type questions. Each question carries 3 marks. 
(6)  Question number 20 to 22 are long answer type question. Each question carries 5 marks. 
(7)  Question number 23 to 27are Multiple Choice Questions. Each question carries 1 mark. 
                                                  SECTION -A 
Q1. What is cutting of mature plants called?   
Ans1- Harvesting. 
Q2. What is the term given to lowest temperature at which a substance burns.   
Ans2 – Ignition temperature  
Q3. Define Deforestation.    
Ans3- Clearing of forests /trees   and using the land for other purposes. 
Q4. Name the process of reproduction in hydra.     
Ans 4- Budding.  
Q5. Name the device used to test whether an object is carrying a charge or not.   
Ans5- Electroscope. 
Q6. What is carbonization?        
Ans6 – Carbonisation is the Slow process of Formation of coal from dead vegetation,under 
high temperature, pressure and absence of oxygen.  
Q7. Draw a well labelled diagram of a candle flame.    
Ans7  
    
Q8. Give the units of frequency and loudness.               
Ans8- SI Unit of frequency-hertz   
          SI Unit of loudness/amplitude- meter  
Q9. State the laws of reflection and draw the diagram.  
Ans9 – I)  -First law states that the incident ray, the normal  and  the reflected ray ,all lie in 
the same plane.                                                                                                                                                     
  II) Second law states that Angle of incidence is equal to angle of reflection  
  
       
Q10.What is an earthquake and how is it measured?                                                                              
Ans10- Earthquake is sudden shaking or trembling of the earth which lasts for a very short 
time. 
 It is caused by disturbance deep inside the earth’s crust. It can cause damage to life and 
property.; 
It is measured by an instrument called seismograph/. The power of its magnitude is expressed 
on Richter scale. 
Q11.What is lightning conductor? How does it work?                                                   
Ans11- Lightening conductor is a safety device which protects the buildings from the effects 
of lightning. 
Page 3


 
 
CLASS VIII 
SCIENCE 
 
GENERAL INSTRUCTIONS: 
(1) The question paper comprises of two sections A and B . You have to attempt both the 
sections.  
(2) All questions are compulsory. 
(3) Question number 1 to 5 are very short answer type questions. Each question carries 1 
mark. 
(4) Question number 6 to 12 are short answer type questions. Each question carries 2 marks. 
(5) Question number 13 to 19 are also short type questions. Each question carries 3 marks. 
(6)  Question number 20 to 22 are long answer type question. Each question carries 5 marks. 
(7)  Question number 23 to 27are Multiple Choice Questions. Each question carries 1 mark. 
                                                  SECTION -A 
Q1. What is cutting of mature plants called?   
Ans1- Harvesting. 
Q2. What is the term given to lowest temperature at which a substance burns.   
Ans2 – Ignition temperature  
Q3. Define Deforestation.    
Ans3- Clearing of forests /trees   and using the land for other purposes. 
Q4. Name the process of reproduction in hydra.     
Ans 4- Budding.  
Q5. Name the device used to test whether an object is carrying a charge or not.   
Ans5- Electroscope. 
Q6. What is carbonization?        
Ans6 – Carbonisation is the Slow process of Formation of coal from dead vegetation,under 
high temperature, pressure and absence of oxygen.  
Q7. Draw a well labelled diagram of a candle flame.    
Ans7  
    
Q8. Give the units of frequency and loudness.               
Ans8- SI Unit of frequency-hertz   
          SI Unit of loudness/amplitude- meter  
Q9. State the laws of reflection and draw the diagram.  
Ans9 – I)  -First law states that the incident ray, the normal  and  the reflected ray ,all lie in 
the same plane.                                                                                                                                                     
  II) Second law states that Angle of incidence is equal to angle of reflection  
  
       
Q10.What is an earthquake and how is it measured?                                                                              
Ans10- Earthquake is sudden shaking or trembling of the earth which lasts for a very short 
time. 
 It is caused by disturbance deep inside the earth’s crust. It can cause damage to life and 
property.; 
It is measured by an instrument called seismograph/. The power of its magnitude is expressed 
on Richter scale. 
Q11.What is lightning conductor? How does it work?                                                   
Ans11- Lightening conductor is a safety device which protects the buildings from the effects 
of lightning. 
 When lightning strikes a building, its tall metallic rod provides an easy route for the transfer 
of electric charge to the underground. The charges pass through the conductor and goes into 
the underground plate. 
Q12. Differentiate between zygote and foetus.   
Ans 12- zygote-It is unicellular, no body parts formed, formed in the oviduct after 
fertilisation   
              Foetus- It is multi cellular; body parts can be identified; formed in the uterus from 
embryo.  
Q13.Explain the process of formation of petroleum.   
Ans13-   Millions of years ago ,dead microscopic organisms living in the sea  got settled  at 
the bottom of the sea and got covered with sand and clay .Under high pressure and temp. , 
absence of air, slowly got converted into petroleum over a period of millions of years. 
Q14.What is meant by combustion? Write any two conditions necessary for combustion?  
Ans14- Burning of fuel in the presence of oxygen to give off heat and light is called 
combustion.  
Presence of Oxygen/ignition temp./Presence of fuel  
Q15. Identify the part which vibrates to produce sound in the following instruments.   
i. Dholak 
ii. Sitar 
iii. flute 
Ans15-(i) –Dholak – stretched membrane 
(ii)Sitar –stretched strings  
(iii)- Flute- air column  
Q16. What are the characteristics of the image formed by plane mirror?    
Ans 16-Image formed by plane mirror is Virtual and erect,of same size as that of the object, 
at same distance from mirror as that of the object; laterally inverted.  
Q17. What is a constellation name any two constellations and draw sketches to show the 
relative positions of prominent stars in them.    
Ans 17Constellation is a group of countable number of stars forming a recognisable shape or 
figure. 
Ex: Ursamajor, Orion    
 
Page 4


 
 
CLASS VIII 
SCIENCE 
 
GENERAL INSTRUCTIONS: 
(1) The question paper comprises of two sections A and B . You have to attempt both the 
sections.  
(2) All questions are compulsory. 
(3) Question number 1 to 5 are very short answer type questions. Each question carries 1 
mark. 
(4) Question number 6 to 12 are short answer type questions. Each question carries 2 marks. 
(5) Question number 13 to 19 are also short type questions. Each question carries 3 marks. 
(6)  Question number 20 to 22 are long answer type question. Each question carries 5 marks. 
(7)  Question number 23 to 27are Multiple Choice Questions. Each question carries 1 mark. 
                                                  SECTION -A 
Q1. What is cutting of mature plants called?   
Ans1- Harvesting. 
Q2. What is the term given to lowest temperature at which a substance burns.   
Ans2 – Ignition temperature  
Q3. Define Deforestation.    
Ans3- Clearing of forests /trees   and using the land for other purposes. 
Q4. Name the process of reproduction in hydra.     
Ans 4- Budding.  
Q5. Name the device used to test whether an object is carrying a charge or not.   
Ans5- Electroscope. 
Q6. What is carbonization?        
Ans6 – Carbonisation is the Slow process of Formation of coal from dead vegetation,under 
high temperature, pressure and absence of oxygen.  
Q7. Draw a well labelled diagram of a candle flame.    
Ans7  
    
Q8. Give the units of frequency and loudness.               
Ans8- SI Unit of frequency-hertz   
          SI Unit of loudness/amplitude- meter  
Q9. State the laws of reflection and draw the diagram.  
Ans9 – I)  -First law states that the incident ray, the normal  and  the reflected ray ,all lie in 
the same plane.                                                                                                                                                     
  II) Second law states that Angle of incidence is equal to angle of reflection  
  
       
Q10.What is an earthquake and how is it measured?                                                                              
Ans10- Earthquake is sudden shaking or trembling of the earth which lasts for a very short 
time. 
 It is caused by disturbance deep inside the earth’s crust. It can cause damage to life and 
property.; 
It is measured by an instrument called seismograph/. The power of its magnitude is expressed 
on Richter scale. 
Q11.What is lightning conductor? How does it work?                                                   
Ans11- Lightening conductor is a safety device which protects the buildings from the effects 
of lightning. 
 When lightning strikes a building, its tall metallic rod provides an easy route for the transfer 
of electric charge to the underground. The charges pass through the conductor and goes into 
the underground plate. 
Q12. Differentiate between zygote and foetus.   
Ans 12- zygote-It is unicellular, no body parts formed, formed in the oviduct after 
fertilisation   
              Foetus- It is multi cellular; body parts can be identified; formed in the uterus from 
embryo.  
Q13.Explain the process of formation of petroleum.   
Ans13-   Millions of years ago ,dead microscopic organisms living in the sea  got settled  at 
the bottom of the sea and got covered with sand and clay .Under high pressure and temp. , 
absence of air, slowly got converted into petroleum over a period of millions of years. 
Q14.What is meant by combustion? Write any two conditions necessary for combustion?  
Ans14- Burning of fuel in the presence of oxygen to give off heat and light is called 
combustion.  
Presence of Oxygen/ignition temp./Presence of fuel  
Q15. Identify the part which vibrates to produce sound in the following instruments.   
i. Dholak 
ii. Sitar 
iii. flute 
Ans15-(i) –Dholak – stretched membrane 
(ii)Sitar –stretched strings  
(iii)- Flute- air column  
Q16. What are the characteristics of the image formed by plane mirror?    
Ans 16-Image formed by plane mirror is Virtual and erect,of same size as that of the object, 
at same distance from mirror as that of the object; laterally inverted.  
Q17. What is a constellation name any two constellations and draw sketches to show the 
relative positions of prominent stars in them.    
Ans 17Constellation is a group of countable number of stars forming a recognisable shape or 
figure. 
Ex: Ursamajor, Orion    
 
 
Ursa Major 
 
Q18. I) Define light year.             
         ii) What are artificial satellites ? 
        iii) What are their uses (Any Two). 
 
Ans 18-Light year is the distance travelled by light in one year.  
   (ii)Artificial satellites are manmade satellites which revolve around a planet/earth.  
  (iii)Uses-Remote sensing/weather forecasting/ tele-communication.  
Q19. Mention one use each of (i) Coke (ii) Coal gas (iii) Bitumen.     
Ans 19- Coke- Extraction of metals/steel formation  
               Coal gas –As a fuel  
                Bitumen- for road surfacing/paints  
Q20. i) What are the advantages of using manures?      
         ii) Explain how fertilizers are different from manures.  
Ans 20- i) Manures increases water holding capacity of soil.  
              Makes soil porous for easy exchange of gases/friendly microbes increases.  
ii) Difference between manure and fertilisers  
1. Manure is an organic substance. 
Page 5


 
 
CLASS VIII 
SCIENCE 
 
GENERAL INSTRUCTIONS: 
(1) The question paper comprises of two sections A and B . You have to attempt both the 
sections.  
(2) All questions are compulsory. 
(3) Question number 1 to 5 are very short answer type questions. Each question carries 1 
mark. 
(4) Question number 6 to 12 are short answer type questions. Each question carries 2 marks. 
(5) Question number 13 to 19 are also short type questions. Each question carries 3 marks. 
(6)  Question number 20 to 22 are long answer type question. Each question carries 5 marks. 
(7)  Question number 23 to 27are Multiple Choice Questions. Each question carries 1 mark. 
                                                  SECTION -A 
Q1. What is cutting of mature plants called?   
Ans1- Harvesting. 
Q2. What is the term given to lowest temperature at which a substance burns.   
Ans2 – Ignition temperature  
Q3. Define Deforestation.    
Ans3- Clearing of forests /trees   and using the land for other purposes. 
Q4. Name the process of reproduction in hydra.     
Ans 4- Budding.  
Q5. Name the device used to test whether an object is carrying a charge or not.   
Ans5- Electroscope. 
Q6. What is carbonization?        
Ans6 – Carbonisation is the Slow process of Formation of coal from dead vegetation,under 
high temperature, pressure and absence of oxygen.  
Q7. Draw a well labelled diagram of a candle flame.    
Ans7  
    
Q8. Give the units of frequency and loudness.               
Ans8- SI Unit of frequency-hertz   
          SI Unit of loudness/amplitude- meter  
Q9. State the laws of reflection and draw the diagram.  
Ans9 – I)  -First law states that the incident ray, the normal  and  the reflected ray ,all lie in 
the same plane.                                                                                                                                                     
  II) Second law states that Angle of incidence is equal to angle of reflection  
  
       
Q10.What is an earthquake and how is it measured?                                                                              
Ans10- Earthquake is sudden shaking or trembling of the earth which lasts for a very short 
time. 
 It is caused by disturbance deep inside the earth’s crust. It can cause damage to life and 
property.; 
It is measured by an instrument called seismograph/. The power of its magnitude is expressed 
on Richter scale. 
Q11.What is lightning conductor? How does it work?                                                   
Ans11- Lightening conductor is a safety device which protects the buildings from the effects 
of lightning. 
 When lightning strikes a building, its tall metallic rod provides an easy route for the transfer 
of electric charge to the underground. The charges pass through the conductor and goes into 
the underground plate. 
Q12. Differentiate between zygote and foetus.   
Ans 12- zygote-It is unicellular, no body parts formed, formed in the oviduct after 
fertilisation   
              Foetus- It is multi cellular; body parts can be identified; formed in the uterus from 
embryo.  
Q13.Explain the process of formation of petroleum.   
Ans13-   Millions of years ago ,dead microscopic organisms living in the sea  got settled  at 
the bottom of the sea and got covered with sand and clay .Under high pressure and temp. , 
absence of air, slowly got converted into petroleum over a period of millions of years. 
Q14.What is meant by combustion? Write any two conditions necessary for combustion?  
Ans14- Burning of fuel in the presence of oxygen to give off heat and light is called 
combustion.  
Presence of Oxygen/ignition temp./Presence of fuel  
Q15. Identify the part which vibrates to produce sound in the following instruments.   
i. Dholak 
ii. Sitar 
iii. flute 
Ans15-(i) –Dholak – stretched membrane 
(ii)Sitar –stretched strings  
(iii)- Flute- air column  
Q16. What are the characteristics of the image formed by plane mirror?    
Ans 16-Image formed by plane mirror is Virtual and erect,of same size as that of the object, 
at same distance from mirror as that of the object; laterally inverted.  
Q17. What is a constellation name any two constellations and draw sketches to show the 
relative positions of prominent stars in them.    
Ans 17Constellation is a group of countable number of stars forming a recognisable shape or 
figure. 
Ex: Ursamajor, Orion    
 
 
Ursa Major 
 
Q18. I) Define light year.             
         ii) What are artificial satellites ? 
        iii) What are their uses (Any Two). 
 
Ans 18-Light year is the distance travelled by light in one year.  
   (ii)Artificial satellites are manmade satellites which revolve around a planet/earth.  
  (iii)Uses-Remote sensing/weather forecasting/ tele-communication.  
Q19. Mention one use each of (i) Coke (ii) Coal gas (iii) Bitumen.     
Ans 19- Coke- Extraction of metals/steel formation  
               Coal gas –As a fuel  
                Bitumen- for road surfacing/paints  
Q20. i) What are the advantages of using manures?      
         ii) Explain how fertilizers are different from manures.  
Ans 20- i) Manures increases water holding capacity of soil.  
              Makes soil porous for easy exchange of gases/friendly microbes increases.  
ii) Difference between manure and fertilisers  
1. Manure is an organic substance. 
2.It is obtained from the decomposition of plant or animal wastes 
3. It rich in multiple nutrients. 
1. Fertilisers are chemical substances. 
2. It is produced in factories 
3. They are rich in a particular nutrient.  
Q21. Define asexual reproduction. Name two methods of asexual reproduction .Explain any 
one and draw the diagram.                                                                      
.Ans21- Asexual reproduction is that in which new generation is produced from a single 
parent withoutfertilisation.   
Two methods of asexual reproduction are 
1 Budding in hydra  
2. Binary fission in amoeba              
 Amoeba is a single-celled organisms. It begins the process of reproduction by the division 
of its nucleus into two nuclei. This is followed by division of its body into two, each part 
receiving a nucleus. Finally, two amoebae are produced from one parent amoeba .This 
type of asexual reproduction is called binary fission.  
 
 
Q22. (a)  Differentiate between zoo and sanctuary.       
        (b) Explain how deforestation leads to reduced rainfall.