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25.

If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella

A.	more inclined when moving	B.	less inclined when moving
C.	more inclined when standing	D.	less inclined when standing

26.

If two equal forces of magnitude P act at an angle 9°, their resultant will be

A.	P/2 cos 9/2	B.	IP sin 9/2
C.	2P tan 9/2	D.	IP cos 9/2

27.

In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than

A.	two members with unknown forces of the frame	B.	three members with unknown forces of the frame
C.	four members with unknown forces of the frame	D.	three members with known forces of the frame

28.

In the equation of virtual work, following force is neglected

A.	reaction of any smooth surface with which the body is in contact	B.	reaction of a rough surface of a body which rolls on it without slipping
C.	reaction at a point or an axis, fixed in space, around which a body is con-strained to turn	D.	all of the above

29.

Kinetic friction is the

A.	tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction	B.	ratio of limiting friction and normal reaction
C.	the friction force acting when the body is just about to move	D.	the friction force acting when the body is in motion

30.

Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction

A.	along the plane	B.	horizontally
C.	vertically	D.	at an angle equal to the angle of fric¬tion to the inclined plane

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