Sample Papers - 10, Science, Class 8 Class 8 Notes | EduRev

Science Class 8

Created by: Manju Sen

Class 8 : Sample Papers - 10, Science, Class 8 Class 8 Notes | EduRev

 Page 1


 
 
 
SCIENCE 
 
CLASS-VIII  
 
General Instructions : 
1. Marks for each type of question are indicated against it. 
2. Attempt all questions in proper sequence. 
3. Diagrams should be drawn neatly. 
 
 
 
1.  Answer the following questions briefly : 
(a) How does atmospheric pressure vary with altitude ? 
(b)  Why are some fibres called  synthetic ? 
(c) How is Wildlife sanctuary different from national park ? 
(d) Jia notes down  some features of organism X. 
Organism X 
It is a micro-organism 
It needs air, food and water 
It can be used to make bread 
Identify the organism 
(lxl6=16) 
Page 2


 
 
 
SCIENCE 
 
CLASS-VIII  
 
General Instructions : 
1. Marks for each type of question are indicated against it. 
2. Attempt all questions in proper sequence. 
3. Diagrams should be drawn neatly. 
 
 
 
1.  Answer the following questions briefly : 
(a) How does atmospheric pressure vary with altitude ? 
(b)  Why are some fibres called  synthetic ? 
(c) How is Wildlife sanctuary different from national park ? 
(d) Jia notes down  some features of organism X. 
Organism X 
It is a micro-organism 
It needs air, food and water 
It can be used to make bread 
Identify the organism 
(lxl6=16) 
(2 )
 
 
(e) Does pure water conduct electricity? What can you do to increase its conductivity? 
(f) What is composition of poly-wool ? 
(g) The diagram below shows two types of organisms 
 
 
 
 
Write one feature which is common in these organisms ? 
(h) Why rayon is called artificial silk ? 
(i)  What are the long-term effects of using fertilizers in the field ? 
 
(j) Two friends A and Bare applying a force of2N and 4N on a box in the same direction. 
Calculate the total force applied by them. 
(k) Why gold is used in pure zari work on saris and other dress materials ? 
(l)  Name two contact forces. 
(m) What is vibration ? 
(n)   Name one metal which satisfies each of the following description. 
I. a metal that replaces silver from silver nitrate solution 
II. a metal that burns in oxygen with a· bright white light. 
(o)  What is the significance of Red Data Book ? 
(p) Write the full form of LED. 
 
2.  How does deforestation lead to desertification ?  (2xl3=26) 
3.  ·Saloni took a piece of burning charcoal and collected the gas evolved in a test tube : 
(a) How will she  find the nature of the gas ? 
· (b) Write down the word equation of all the reactions taking place in this process. 
 
- 4.  Recycling of paper conserve our natural resources. How ? 
5.  Rahul and Rohan brought some iron nails for their class project in advance. While Rahul 
Page 3


 
 
 
SCIENCE 
 
CLASS-VIII  
 
General Instructions : 
1. Marks for each type of question are indicated against it. 
2. Attempt all questions in proper sequence. 
3. Diagrams should be drawn neatly. 
 
 
 
1.  Answer the following questions briefly : 
(a) How does atmospheric pressure vary with altitude ? 
(b)  Why are some fibres called  synthetic ? 
(c) How is Wildlife sanctuary different from national park ? 
(d) Jia notes down  some features of organism X. 
Organism X 
It is a micro-organism 
It needs air, food and water 
It can be used to make bread 
Identify the organism 
(lxl6=16) 
(2 )
 
 
(e) Does pure water conduct electricity? What can you do to increase its conductivity? 
(f) What is composition of poly-wool ? 
(g) The diagram below shows two types of organisms 
 
 
 
 
Write one feature which is common in these organisms ? 
(h) Why rayon is called artificial silk ? 
(i)  What are the long-term effects of using fertilizers in the field ? 
 
(j) Two friends A and Bare applying a force of2N and 4N on a box in the same direction. 
Calculate the total force applied by them. 
(k) Why gold is used in pure zari work on saris and other dress materials ? 
(l)  Name two contact forces. 
(m) What is vibration ? 
(n)   Name one metal which satisfies each of the following description. 
I. a metal that replaces silver from silver nitrate solution 
II. a metal that burns in oxygen with a· bright white light. 
(o)  What is the significance of Red Data Book ? 
(p) Write the full form of LED. 
 
2.  How does deforestation lead to desertification ?  (2xl3=26) 
3.  ·Saloni took a piece of burning charcoal and collected the gas evolved in a test tube : 
(a) How will she  find the nature of the gas ? 
· (b) Write down the word equation of all the reactions taking place in this process. 
 
- 4.  Recycling of paper conserve our natural resources. How ? 
5.  Rahul and Rohan brought some iron nails for their class project in advance. While Rahul 
(3 )
 
 
kept his iron nails neatly packed in an air tight box, Rohan carelessly left his iron nails in the 
open. In which condition did they find their iron nails after some time. Give appropriate 
reason for your answer. 
6.  A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency. 
7.  What points should be kept in mind while sowing seeds ? 
8.  What is the best time to remove weeds from the field ? Why ? 
9.  One day Radha went to a jewelers shop with her mother. Her mother gave an old jewelry to 
the goldsmith to polish. Next day when they brought the jewelry back, they found that there 
was a slight loss in its weight. Explain the reason behind this. 
10.  Why is it dangerous to leave plastic bags near a burning stove ? 
11.  Describe how are we able to hear sound. 
12.  (i)  Can we hear sound on moon ? Give reason in support of your answer. 
(ii) What is the range of audible sound ? 
 
13.  You must have heard the slogan, "Say no to poly bag". Give two reasons in support of this 
slogan. 
14.  Differentiate between 
(a) monomer and polymer 
(b) thermosetting plastics and thermoplastics 
Page 4


 
 
 
SCIENCE 
 
CLASS-VIII  
 
General Instructions : 
1. Marks for each type of question are indicated against it. 
2. Attempt all questions in proper sequence. 
3. Diagrams should be drawn neatly. 
 
 
 
1.  Answer the following questions briefly : 
(a) How does atmospheric pressure vary with altitude ? 
(b)  Why are some fibres called  synthetic ? 
(c) How is Wildlife sanctuary different from national park ? 
(d) Jia notes down  some features of organism X. 
Organism X 
It is a micro-organism 
It needs air, food and water 
It can be used to make bread 
Identify the organism 
(lxl6=16) 
(2 )
 
 
(e) Does pure water conduct electricity? What can you do to increase its conductivity? 
(f) What is composition of poly-wool ? 
(g) The diagram below shows two types of organisms 
 
 
 
 
Write one feature which is common in these organisms ? 
(h) Why rayon is called artificial silk ? 
(i)  What are the long-term effects of using fertilizers in the field ? 
 
(j) Two friends A and Bare applying a force of2N and 4N on a box in the same direction. 
Calculate the total force applied by them. 
(k) Why gold is used in pure zari work on saris and other dress materials ? 
(l)  Name two contact forces. 
(m) What is vibration ? 
(n)   Name one metal which satisfies each of the following description. 
I. a metal that replaces silver from silver nitrate solution 
II. a metal that burns in oxygen with a· bright white light. 
(o)  What is the significance of Red Data Book ? 
(p) Write the full form of LED. 
 
2.  How does deforestation lead to desertification ?  (2xl3=26) 
3.  ·Saloni took a piece of burning charcoal and collected the gas evolved in a test tube : 
(a) How will she  find the nature of the gas ? 
· (b) Write down the word equation of all the reactions taking place in this process. 
 
- 4.  Recycling of paper conserve our natural resources. How ? 
5.  Rahul and Rohan brought some iron nails for their class project in advance. While Rahul 
(3 )
 
 
kept his iron nails neatly packed in an air tight box, Rohan carelessly left his iron nails in the 
open. In which condition did they find their iron nails after some time. Give appropriate 
reason for your answer. 
6.  A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency. 
7.  What points should be kept in mind while sowing seeds ? 
8.  What is the best time to remove weeds from the field ? Why ? 
9.  One day Radha went to a jewelers shop with her mother. Her mother gave an old jewelry to 
the goldsmith to polish. Next day when they brought the jewelry back, they found that there 
was a slight loss in its weight. Explain the reason behind this. 
10.  Why is it dangerous to leave plastic bags near a burning stove ? 
11.  Describe how are we able to hear sound. 
12.  (i)  Can we hear sound on moon ? Give reason in support of your answer. 
(ii) What is the range of audible sound ? 
 
13.  You must have heard the slogan, "Say no to poly bag". Give two reasons in support of this 
slogan. 
14.  Differentiate between 
(a) monomer and polymer 
(b) thermosetting plastics and thermoplastics 
(4 )
 
 
 
15.  Comment  on  the following  statements : 
(a)  Refrigerators  and  freezers  have a plastic foam  core. 
(b) Electrical  wires  have  a plastic covering. 
(c)  Non-stick  cookware  have Teflon coating. 
 
(8x3=24) 
 
16.  How does the percentage of nitrogen remains constant  in atmosphere ? Explain with the 
help of flowchart. 
17.  What  happens  when 
 
(a)  an  iron  knife  is kept dipped  in blue copper  sulphate  solution. 
(b)  Zinc  piece  is added  into aluminum  nitrate solution  ? 
(c)  Silver  is added  into silver  nitrate solution  ? 
 
18.  Give  reasons  : 
(i) Porters  place  a round  piece  of cloth  on their  head  to lift  load. 
(ii)  Mountaineers  suffer  nose  bleeding at  high altitudes. 
(iii)  Soles  of  shoes  are grooved. 
 
19.  What  is the  impact of  deforestation  on  : 
(i)   wildlife  (ii)   future  generation 
 
(iii)  villages 
 
20.   (i) Suppose your writing table has titled a little. A book kept on it starts sliding down. Show 
diagrammatically  direction  of frictional  force acting  on  it. 
(ii)  Why friction  is regarded  as a friend  and  a foe ? 
 
21. ,  Why  is water  important  for crops ? 
 
 
 
22.   Give  reasons  : 
(a)  Why can't  copper  displace  zinc from  its salt  solution ? 
(b)  Why can't  wires  of coal  drawn ? 
(c) What happens when a burning matchstick is brought near to the mouth of a test tube in 
which a metal  has  reacted  with hydrochloric  acid  ? 
Page 5


 
 
 
SCIENCE 
 
CLASS-VIII  
 
General Instructions : 
1. Marks for each type of question are indicated against it. 
2. Attempt all questions in proper sequence. 
3. Diagrams should be drawn neatly. 
 
 
 
1.  Answer the following questions briefly : 
(a) How does atmospheric pressure vary with altitude ? 
(b)  Why are some fibres called  synthetic ? 
(c) How is Wildlife sanctuary different from national park ? 
(d) Jia notes down  some features of organism X. 
Organism X 
It is a micro-organism 
It needs air, food and water 
It can be used to make bread 
Identify the organism 
(lxl6=16) 
(2 )
 
 
(e) Does pure water conduct electricity? What can you do to increase its conductivity? 
(f) What is composition of poly-wool ? 
(g) The diagram below shows two types of organisms 
 
 
 
 
Write one feature which is common in these organisms ? 
(h) Why rayon is called artificial silk ? 
(i)  What are the long-term effects of using fertilizers in the field ? 
 
(j) Two friends A and Bare applying a force of2N and 4N on a box in the same direction. 
Calculate the total force applied by them. 
(k) Why gold is used in pure zari work on saris and other dress materials ? 
(l)  Name two contact forces. 
(m) What is vibration ? 
(n)   Name one metal which satisfies each of the following description. 
I. a metal that replaces silver from silver nitrate solution 
II. a metal that burns in oxygen with a· bright white light. 
(o)  What is the significance of Red Data Book ? 
(p) Write the full form of LED. 
 
2.  How does deforestation lead to desertification ?  (2xl3=26) 
3.  ·Saloni took a piece of burning charcoal and collected the gas evolved in a test tube : 
(a) How will she  find the nature of the gas ? 
· (b) Write down the word equation of all the reactions taking place in this process. 
 
- 4.  Recycling of paper conserve our natural resources. How ? 
5.  Rahul and Rohan brought some iron nails for their class project in advance. While Rahul 
(3 )
 
 
kept his iron nails neatly packed in an air tight box, Rohan carelessly left his iron nails in the 
open. In which condition did they find their iron nails after some time. Give appropriate 
reason for your answer. 
6.  A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency. 
7.  What points should be kept in mind while sowing seeds ? 
8.  What is the best time to remove weeds from the field ? Why ? 
9.  One day Radha went to a jewelers shop with her mother. Her mother gave an old jewelry to 
the goldsmith to polish. Next day when they brought the jewelry back, they found that there 
was a slight loss in its weight. Explain the reason behind this. 
10.  Why is it dangerous to leave plastic bags near a burning stove ? 
11.  Describe how are we able to hear sound. 
12.  (i)  Can we hear sound on moon ? Give reason in support of your answer. 
(ii) What is the range of audible sound ? 
 
13.  You must have heard the slogan, "Say no to poly bag". Give two reasons in support of this 
slogan. 
14.  Differentiate between 
(a) monomer and polymer 
(b) thermosetting plastics and thermoplastics 
(4 )
 
 
 
15.  Comment  on  the following  statements : 
(a)  Refrigerators  and  freezers  have a plastic foam  core. 
(b) Electrical  wires  have  a plastic covering. 
(c)  Non-stick  cookware  have Teflon coating. 
 
(8x3=24) 
 
16.  How does the percentage of nitrogen remains constant  in atmosphere ? Explain with the 
help of flowchart. 
17.  What  happens  when 
 
(a)  an  iron  knife  is kept dipped  in blue copper  sulphate  solution. 
(b)  Zinc  piece  is added  into aluminum  nitrate solution  ? 
(c)  Silver  is added  into silver  nitrate solution  ? 
 
18.  Give  reasons  : 
(i) Porters  place  a round  piece  of cloth  on their  head  to lift  load. 
(ii)  Mountaineers  suffer  nose  bleeding at  high altitudes. 
(iii)  Soles  of  shoes  are grooved. 
 
19.  What  is the  impact of  deforestation  on  : 
(i)   wildlife  (ii)   future  generation 
 
(iii)  villages 
 
20.   (i) Suppose your writing table has titled a little. A book kept on it starts sliding down. Show 
diagrammatically  direction  of frictional  force acting  on  it. 
(ii)  Why friction  is regarded  as a friend  and  a foe ? 
 
21. ,  Why  is water  important  for crops ? 
 
 
 
22.   Give  reasons  : 
(a)  Why can't  copper  displace  zinc from  its salt  solution ? 
(b)  Why can't  wires  of coal  drawn ? 
(c) What happens when a burning matchstick is brought near to the mouth of a test tube in 
which a metal  has  reacted  with hydrochloric  acid  ? 
 
 
23.   Differentiate  between 
 
(i) sliding  and  static  friction. 
(ii)  contact  and  non-contact  force. 
(2+2=4) 
 
24.  (a) Mosquitoes are harmful  insects that spread diseases to man. The best way to get rid of 
them  is t:o get  rid of  any stagnant  water. {1+2+2=5) 
 
 
 
 
 
 
. ... · .. .... · ...·  ... •  . 
 
 
 
 
 
-. .. .., 
 
 
 
Based on the diagram above, explain how getting rid of stagnant water prevents mosquitoes 
from  breeding. 
(b)  What steps  should  be taken to  prevent food  poisoning  ? 
(c)  Complete  the table  given  below : 
 
 
 
Name of the food 
item 
Preservative  used  Reason 
Meat/fish  
-------------------r------------------
 
Milk 
 
25.  (i)  What  is electroplating  ?  
•
 
(ii)  With the  help of  a circuit  diagram  explain  electroplating  of  a steel spoon. 
(1+4=5) 
 
 
 
 
 
( 4 ) 
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