Class 8 Science: CBSE Sample Question Paper - 3 | Sample Papers For Class 8 PDF Download

 Page 1


(1/3) 
SCIENCE 
Class VIII 
General Instructions – 
• Attempt all the questions. 
• Read the instructions carefully before answering the questions. 
• Draw neat and clean diagram wherever required. 
• Question no. 8(i) is a value based question and is compulsory to attempt. 
 
Q.1 Choose the correct option. (1×6=6) 
 i) Which of the following will displace copper from a solution of copper (II)  sulphate? 
  a) Magnesium b) Aluminium  
  c) Iron d) All of these  
 ii) Which of the following is not true?  
  a) Friction wears down machine 
parts 
b) Friction helps us walk  
  c) Friction helps a ship move 
through water 
d) Friction produces heat  
 iii) Cheek cells are -  
  a) Epithelial cells b) Epidermal cells  
  c) Vascular cells d) Guard cells  
 iv) Sound travels -  
  a) the fastest in air
 
b) the fastest in vacuum
 
 
  c) faster in air than in water
 
d) faster in solids than in air
 
 
 v) Charge flows from a charged body to an uncharged one -  
  a) until the entire charge from 
one flow into the other 
b) until they both carry the same 
charge 
 
  c) until they both become 
uncharged 
d) continuously  
 vi) Seabeds have large deposits of silica derived from -  
  a) snails b) protozoans  
  c) bacteria d) diatoms  
Q.2 Fill in the blanks with suitable words. (1×6=6) 
 a) The force which opposes the motion of one body over another is ______ 
force. 
b) The matrix in which blood cells are suspended is called ______. 
 
Page 2


(1/3) 
SCIENCE 
Class VIII 
General Instructions – 
• Attempt all the questions. 
• Read the instructions carefully before answering the questions. 
• Draw neat and clean diagram wherever required. 
• Question no. 8(i) is a value based question and is compulsory to attempt. 
 
Q.1 Choose the correct option. (1×6=6) 
 i) Which of the following will displace copper from a solution of copper (II)  sulphate? 
  a) Magnesium b) Aluminium  
  c) Iron d) All of these  
 ii) Which of the following is not true?  
  a) Friction wears down machine 
parts 
b) Friction helps us walk  
  c) Friction helps a ship move 
through water 
d) Friction produces heat  
 iii) Cheek cells are -  
  a) Epithelial cells b) Epidermal cells  
  c) Vascular cells d) Guard cells  
 iv) Sound travels -  
  a) the fastest in air
 
b) the fastest in vacuum
 
 
  c) faster in air than in water
 
d) faster in solids than in air
 
 
 v) Charge flows from a charged body to an uncharged one -  
  a) until the entire charge from 
one flow into the other 
b) until they both carry the same 
charge 
 
  c) until they both become 
uncharged 
d) continuously  
 vi) Seabeds have large deposits of silica derived from -  
  a) snails b) protozoans  
  c) bacteria d) diatoms  
Q.2 Fill in the blanks with suitable words. (1×6=6) 
 a) The force which opposes the motion of one body over another is ______ 
force. 
b) The matrix in which blood cells are suspended is called ______. 
 
(2/3) 
c) The reflecting surface has to be at least ______ away for us to hear an echo 
distinctly. 
d) Sugar ? ? ? ? ? ?
on fermentati
CO
2
 + ______. 
e) Electrons carry ______ charge. 
f) A ______ of grains is maintained to provide food during emergencies. 
Q.3 Give one word for the following. (1×6=6) 
 a) The metals which allow an electric current to pass through them easily. 
b) An instrument used to measure pressure in liquid. 
c) The protein part of the egg. 
d) The dense tangle of chromosomes inside the nucleus. 
e) A reflected sound. 
f) A protozoan which can photosynthesize. 
 
Q.4 Define any five of the following. (2×5=10) 
 a) Symbiosis b)  Noble metals  c)  Pressure  
d)    Amplitude     e)  Earthing   f)  Green manure 
 
Q.5 Give reason for the following. (2×3=6) 
 a) Why can’t we draw wires from a piece of wood or coal? 
b) Why is the moon’s force of gravity less than that of earth? 
c) Why do some bacteria form cysts / spores? 
 
Q.6 Draw and label any two of the following. (3×2=6) 
 a)   A nerve cell  b) Escherichia coli (A bacterial cell) 
c) Paramoecium  d) Gold leaf electroscope 
Q.7 Answer the following questions in not more than 20 words. (Any 6) (2×6=12) 
 i) What is animal husbandry? Give two examples of animal husbandry. 
ii) Mention two uses of oxygen. 
iii) Why do we stain specimens before viewing them under a microscope? 
iv) How do bats use echoes? 
v) Name the four major groups of bacteria on the basis of their shape. 
vi) What would you expect if a plastic ruler is vigorously rubbed with a woollen cloth? 
vii) Mention any two disadvantages of frictional force. 
Q.8 Answer the following questions in not more than 40 words. (Attempt (i) and 
any five from the rest). 
(3×6=18) 
 i) Nandini has prepared Mango pickle for her family. When the pickle was 
 ready, her grandmother asked Nandini to keep the pickle under sunlight for 
 few days. Nandini followed the suggestion of her grandmother. The family 
 enjoyed the taste of pickles till the next summer without spoilage. 
 
Page 3


(1/3) 
SCIENCE 
Class VIII 
General Instructions – 
• Attempt all the questions. 
• Read the instructions carefully before answering the questions. 
• Draw neat and clean diagram wherever required. 
• Question no. 8(i) is a value based question and is compulsory to attempt. 
 
Q.1 Choose the correct option. (1×6=6) 
 i) Which of the following will displace copper from a solution of copper (II)  sulphate? 
  a) Magnesium b) Aluminium  
  c) Iron d) All of these  
 ii) Which of the following is not true?  
  a) Friction wears down machine 
parts 
b) Friction helps us walk  
  c) Friction helps a ship move 
through water 
d) Friction produces heat  
 iii) Cheek cells are -  
  a) Epithelial cells b) Epidermal cells  
  c) Vascular cells d) Guard cells  
 iv) Sound travels -  
  a) the fastest in air
 
b) the fastest in vacuum
 
 
  c) faster in air than in water
 
d) faster in solids than in air
 
 
 v) Charge flows from a charged body to an uncharged one -  
  a) until the entire charge from 
one flow into the other 
b) until they both carry the same 
charge 
 
  c) until they both become 
uncharged 
d) continuously  
 vi) Seabeds have large deposits of silica derived from -  
  a) snails b) protozoans  
  c) bacteria d) diatoms  
Q.2 Fill in the blanks with suitable words. (1×6=6) 
 a) The force which opposes the motion of one body over another is ______ 
force. 
b) The matrix in which blood cells are suspended is called ______. 
 
(2/3) 
c) The reflecting surface has to be at least ______ away for us to hear an echo 
distinctly. 
d) Sugar ? ? ? ? ? ?
on fermentati
CO
2
 + ______. 
e) Electrons carry ______ charge. 
f) A ______ of grains is maintained to provide food during emergencies. 
Q.3 Give one word for the following. (1×6=6) 
 a) The metals which allow an electric current to pass through them easily. 
b) An instrument used to measure pressure in liquid. 
c) The protein part of the egg. 
d) The dense tangle of chromosomes inside the nucleus. 
e) A reflected sound. 
f) A protozoan which can photosynthesize. 
 
Q.4 Define any five of the following. (2×5=10) 
 a) Symbiosis b)  Noble metals  c)  Pressure  
d)    Amplitude     e)  Earthing   f)  Green manure 
 
Q.5 Give reason for the following. (2×3=6) 
 a) Why can’t we draw wires from a piece of wood or coal? 
b) Why is the moon’s force of gravity less than that of earth? 
c) Why do some bacteria form cysts / spores? 
 
Q.6 Draw and label any two of the following. (3×2=6) 
 a)   A nerve cell  b) Escherichia coli (A bacterial cell) 
c) Paramoecium  d) Gold leaf electroscope 
Q.7 Answer the following questions in not more than 20 words. (Any 6) (2×6=12) 
 i) What is animal husbandry? Give two examples of animal husbandry. 
ii) Mention two uses of oxygen. 
iii) Why do we stain specimens before viewing them under a microscope? 
iv) How do bats use echoes? 
v) Name the four major groups of bacteria on the basis of their shape. 
vi) What would you expect if a plastic ruler is vigorously rubbed with a woollen cloth? 
vii) Mention any two disadvantages of frictional force. 
Q.8 Answer the following questions in not more than 40 words. (Attempt (i) and 
any five from the rest). 
(3×6=18) 
 i) Nandini has prepared Mango pickle for her family. When the pickle was 
 ready, her grandmother asked Nandini to keep the pickle under sunlight for 
 few days. Nandini followed the suggestion of her grandmother. The family 
 enjoyed the taste of pickles till the next summer without spoilage. 
 
(3/3) 
a) In the above situation, what was the reason you think, to keep the pickles 
under the Sun? 
b) Write any other two methods of food preservation. 
c) Write any one value shown by the grandmother. 
ii) What is surface irrigation? Mention any two modes of irrigation under this 
 category. 
iii) How does (a) oiling and (b) using ball bearing help reduce friction? 
iv) What are the different types of plastids? What do they do? 
v) What is the basic difference between music and noise? What are regular 
 vibrations? 
vi) Mention three uses of Algae. 
vii) How a piece of Styrofoam gets charged when it is rubbed with a piece of 
 paper? 
Q.9 Answer the following in not more than 100 words. (Any 5) (5×5=25) 
 i) a) Why is crop rotation considered a good agricultural practice? 
b) What are root nodules? How are they helpful? 
ii) a) Give two examples of situations in which it is useful to increase friction. 
b) What makes the coaster placed over the rim of a glass of water stick even        
    when you invert it? 
iii) Differentiate between plant cell and animal cell. Draw diagrams to support your 
answer. 
iv) How does lightning occur? 
v) How would you use the activity series while studying the displacement of 
hydrogen from acids by metals? 
vi) a)   Name any two noncontact forces. 
b)  How would you demonstrate that pressure exerted by liquid is same in all 
     direction at a given depth? 
 
Q.10 Look at the diagram given below and answer the following questions. (3+1+1=5) 
 
 
 i) Label the parts given as a, b, c, d, e and f. 
ii) What is the function of ear drum? 
iii) Give a suitable heading to the diagram.