Friction Class 8 Quiz Question with Answer
Friction Class 8 Quiz Question with Answer. CBSE Class 8 Science Lesson 12 Mock Test.
1) Rolling friction produces ___________.
A) Most friction
B) Least friction
C) Both (A) And (B)
D) None of these
Solution: (B) Least friction
Explanation: rolling friction produces least friction, because the force of friction depends on the area of contact with 2 surfaces as the area of contact is less in the rolling friction.
2) The shape of aeroplane is like a ________
A) Car
B) Cow
C) Bird
D) All the above.
Solution: (C) Bird
Explanation:: the shape of the aeroplane is like a bird. Birds have a special shape called “Streamlined”. The fluid friction can be reduced by streamline shaped. Hence, aeroplanes are made up in the shape of a bird.
3) Wheels are an example of ________________.
A) Rolling friction
B) Reduce friction
C) Increase friction
D) Least friction
Solution: (A) Rolling friction
Explanation: rolling resistance sometimes called rolling friction wheels rolls on the surface; hence a wheel is a rolling friction.
4) Lubrication’s is used for which of the following?
a) Rolling friction
b) Reduce friction
c) Increase friction
d) None of these
Solution: (B) Reduce friction
Explanation: A lubricant is a substance that helps to reduce friction between surfaces in mutual contact; hence the correct option is B
.
5) Rough surface is a _________ friction.
A) Least friction
B) Increase
C) Rolling
D) reduce
Solution: (B) Increase
Explanation: friction can be increased by making the surface rough. Here rough is a increase fraction.
6) Friction is reduced by adding ___________ over.
A) Oil
B) Water
C) Air
D) All the above
Solution: (A) Oil
Explanation: oil is used to reduce friction because it acts as a lubricant which reduces friction.
7) Which of the following statements is incorrect?
A) Friction is always useful to us
B) All liquids are not fluid
C) Friction is dependent
D) All the above.
Solution: (D) All the above
Explanation: here all the statements are incorrect; hence option (D) is the correct option.
8) Sliding friction is greater than which friction of the following?
A) Rolling friction
B) Static friction
C) Both (A) and (B)
D) None of these
Solution: (A) Rolling friction
Explanation: force act is an opposite direction due to the direction in which an object moves rolling friction is much less sliding friction. Hence the correct option is A.
9) Which device is used to measure force acting on an object.
A) Spring balance
B) Beam balance
C) Physical balance
D) None of these
Solution: (A) Spring balance
Explanation: The spring balance contains called spring which gets stretched when a force is applied to its free end.
When spring balance is held vertically it is said to its free end. Therefore option (A) is the correct option.
10) Sliding friction is ______ than static friction
A) More
B) Less
C) Constant
D) None of these
Solution: (B) Less
Explanation: static friction has a rough surface, it increases the friction, and hence sliding friction is less than static friction.
11) Rubbing of sandpaper on sandpaper produce
A) Minimum friction
B) Maximum friction
C) Both (A) and (B)
D) None of these
Solution: (B) Maximum friction
Explanation: friction between two surfaces depends on two factors that is nature of surface and force as the roughness of surface increases, the friction increases. Hence rubbing of sand paper on sandpaper produces maximum friction.
12) Which of the following statements is correct?
A) Friction is force that only occurs when an object moves
B) The force of friction acts in the opposite direction to the direction of motion of an object
C) Friction is caused by the interlocking of irregularities in the surface of the two objects which are in contact with each other.
D) All of the above
Solution: (D) All of the above
Explanation: here, all the statement is correct, hence correct option is (D)
13) The example of rolling friction is ____________.
A) Truck tire
B) Car tire
C) Bowling ball
D) All of the above
Solution: (D) All of the above
Explanation: all are examples of rolling friction, the force resisting the motion of a rolling body on a surface is known as rolling friction.
14) The example of static friction is _____________.
A) A bookmark in a book
B) Paper on a table top
C) A car parked on a hill
D) All of the above
Solution: (D) All of the above
Explanation: here all are examples of static friction because we keep pressure on all the above objects; hence all are examples of static friction.
15) The example of sliding friction is __________
A) A washing machine pushed along with floor
B) A coaster sliding against a table
C) A block being slid across the floor
D) All of the above.
Solution (D) All of the above
Explanation: all are examples of sliding friction, because friction is exerted when an object slides over the surface with a working fluid in between the two bodies.
16) Which of the following friction is strongest?
A) Rolling friction
B) Static friction
C) Both (A) and(B)
D) None of these
Solution: (B) Static friction
Explanation: static friction is strong because there is more force at work keeping to resistant on object once it is in motion.