EASY
UPSC CAPF AC Paper - I
IMPORTANT
Earn 100

Consider the following statements
1. The maximum static frictional force is equal to the area of the surface in contact
2. The maximum static frictional force is independent of the area of the surface in contact
3. The limiting friction is always greater than the dynamic friction.
4. The coefficient of friction between two surfaces increases as the surface in contact is made rough.
Which of the statement(s) is/are not true?

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Important Questions on Physics

EASY
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 1>Q 113
Consider the following statements
  1. Friction is a non-conservative force which always opposes the motion of a body over the other.
  2. The usual methods of reducing friction are polishing of surfaces, lubrication with oil or grease, use of ball bearings etc.
  3. Friction due to air is considerably reduced by streamlining the shape of the body.
  4. Friction depends upon the nature of the material of surfaces in contact.

Which of the statement(s) is/are correct?

EASY
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 1>Q 114
When a body is lying on a rough inclined plane and does not move, the force of friction
EASY
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 1>Q 115
Angle of friction and angle of repose are
EASY
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 1>Q 116
Consider the following pairs of substances/situations:
1. Piece of teflon on another piece of teflon.
2. A block of ice on another block of ice.
3. Rubber tyre on a wet road.
4. Rubber tyre on a dry road.
The correct sequence of the decreasing order of their magnitude of the coefficient of friction is.
EASY
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 1>Q 117
Match the following lists
     List I                                List II
A. Static friction                 1. is slightly less than limiting friction
B. Dynamic friction            2. is maximum value of static friction
C. Limiting friction             3. is equal to tangent of angle of repose
D. Coefficient of friction     4. is self- adjusting
EASY
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 1>Q 118

Consider a vehicle going on a horizontal road towards east. Neglect any force due to air. The frictional force on the vehicle by the road _____.

 

EASY
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 1>Q 119
Assertion (A) On a rainy day, it is difficult to drive a car or bus at high speed.
Reason (R) The value of coefficient of friction is lowered due to wetting of the surface.
EASY
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 1>Q 120
Assertion (A) When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is always in a forwarding direction.
Reason (R) The frictional force acts only when the bodies are in contact.