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91.

The static friction

A.	bears a constant ratio to the normal reaction between the two surfaces	B.	is independent of the area of contact, between the two surfaces
C.	always acts in a direction, opposite to that in which the body tends to move	D.	all of the above

92.

Static friction is always

A.	equal to	B.	less than
C.	greater than

93.

The angle of the inclined plane at which a body just begins to slide down the plane, is called helix angle.

True

False

94.

The angle which the normal reaction makes with the resultant reaction is called angle of friction.

Agree

Disagree

95.

The angle of inclination of the plane at which the body begins to move down the plane, is called

A.	angle of friction	B.	angle of repose
C.	angle of projection	D.	none of these

96.

The minimum force required to slide a body of weight W on a rough horizontal plane is

A.	W sin ?	B.	W cos ?
C.	W tan ?	D.	none of these

97.

A body will begin to move down an inclined plane if the angle of inclination of the plane is

A.	equal to	B.	less than
C.	greater than

98.

Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.

Yes

99.

Coefficient of friction depends upon

A.	area of contact only	B.	nature of surface only
C.	both (a) and (b)	D.	none of these

100.

The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane

A.	equal to	B.	less than
C.	greater than