# MCQ Questions for Class 8 Science Chapter 12 Friction with Answers

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## Friction Class 8 MCQs Questions with Answers

I. Choose the correct option.

Question 1.
Friction is a
(a) non-contact force
(b) contact force
(c) magnetic force
(d) electrostatic force

Answer: (b) contact force

Question 2,.
Which of the following produces least friction?
(a) Sliding friction
(b) Rolling friction
(c) Composite friction
(d) Static friction

Answer: (b) Rolling friction

Question 3.
Friction always
(a) opposes the motion
(b) helps the motion
(c) both (a) and (b)
(d) none of these

Answer: (a) opposes the motion

Question 4.
Friction can be reduced by using
(a) oil
(b) grease
(c) powder
(d) all of these

Answer: (d) all of these

Question 5.
Static friction is less than
(a) sliding friction
(b) rolling friction
(c) both (a) and (b)
(d) none of these

Answer: (d) none of these

Question 6.
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play.
(a) only if the objects are solid.
(b) only if one of the two objects is liquid.
(c) only if one of the two objects is gaseous.
(d) irrespective of whether the objects are solid, liquid or gaseous.

Answer: (d) irrespective of whether the objects are solid, liquid or gaseous.

Question 7.
To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?
(a) stone
(b) Plastic block
(c) Wooden block
(d) Glass block

Question 8.
The shape of an aeroplane is like a
(a) dog
(b) bird
(c) car
(d) all of these

Question 9.
Friction is
(a) foe
(b) friend
(c) both (a) and (b)
(d) none of these

Answer: (c) both (a) and (b)

Question 10.
Friction due to fluids is called
(a) force
(b) pressure
(c) friction
(d) drag

Question 11.
Which of the following is not a smooth surface?
(a) Surface of wet soap
(b) Surface of tyres
(c) Glazed tiles
(d) Surface of mirror

Answer: (b) Surface of tyres

Question 12.
A toy car released with the same initial speed will travel farthest on
(a) muddy surface
(b) polished marble surface
(c) cemented surface
(d) brick surface

Answer: (b) polished marble surface

Question 13.
If we apply oil on door hinges, the friction will
(a) increase
(b) decrease
(c) disappear altogether
(d) will remain unchanged

Question 14.
Lubricant
(a) reduce friction
(b) increase friction
(c) both (a) and (b)
(d) none of these

Answer: (a) reduce friction

Question 15.
Force of friction depends on
(a) roughness of surface
(b) smoothness of surface
(c) inclination of surface
(d) all of these

Answer: (d) all of these

Question 16.
Force of friction depends on
(a) roughness of surface
(b) weight
(c) size
(d) all of these

Answer: (d) all of these

Question 17.
Fluids are
(a) liquids
(b) gases
(c) both (a) and (b)
(d) none of these

Answer: (c) both (a) and (b)

Question 18.
Which is a streamlined object?
(a) Boats
(b) Aeroplanes
(c) Ships
(d) All of these

Answer: (d) All of these

Question 19.
Smooth surface has
(a) less friction
(b) more friction
(c) sometimes less and sometimes more
(d) all of these

Answer: (a) less friction

Question 20.
Which of the following is responsible for wearing out of bicycle tyres?
(a) Muscular force
(b) Magnetic force
(c) Frictional force
(d) Electrostatic force

Answer: (c) Frictional force

II. Fill in the Blanks

Question 1.
Sliding friction is __________ than static friction.

Question 2.
Friction can be reduced by using__________

Answer: oil or powder or grease

Question 3.
Friction can be increased by making surface__________

Question 4.
Rolling friction is __________ than sliding and static friction.

Question 5.
Friction due to fluid is also called __________

Question 6.
Bodies of birds, fishes and ships are __________

Question 7.
Friction can also produce __________

Question 8.
All objects moving in fluids have __________ shape to reduce __________

Question 9.
Rough surfaces produce __________ friction than smooth surfaces.

Question 10.
In many machines, friction is reduced by using __________

Question 11.
Friction depends on the __________ of substances in contact.

Question 12.
Static friction comes into play when we try to move an object at __________

Question 13.
__________ force is responsible for downward movement of a parachutist when he jumps from an air-craft

Question 14.
The sole of shoes and the tyres of vehicles are treaded to __________ friction.

Question 15.
Friction is sometimes ___________

III. True or False

Question 1.
Friction is always useful to us.

Question 2.
Fluids are only liquids.

Question 3.
Friction is less for smooth surfaces.

Question 4.
A soapy floor is slippery due to increased friction.

Question 5.
Friction always works in opposite direction to the relative motion.

Question 6.
Friction is dependent on area of contact.

Question 7.
Sliding friction is less than rolling friction.

Question 8.
Friction decreases with increase in the smoothness of the surface.

Question 9.
It is easier to move a heavy object than a light object.

Question 10.
Friction can be reduced by using lubricants.

Question 11.
Friction is independent of the nature of surfaces in contact.

Question 12.
A spring balance measures force.

Question 13.
Friction can be reduced by using ball bearings in some machines.

Question 14.
Friction can never be eliminated.

Question 15.
Friction do not produce heat.