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Civil Engineering Objective Questions { Applied Mechanics }



1. A retarding force on a body does not
A. change the motion of the body
B. retard the motion of the body
C. introduce the motion of the body
D. none of these.

2. The force acting on a point on the surface of a rigid body may be considered to act
A. at the centre of gravity of the body
B. on the periphery of the body
C. on any point on the line of action of the force
D. at any point on the surface normal to the line of action of the force.

3. A number of forces acting simultaneously on a particle of a body
A. may not be replaced by a single force
B. may be replaced by a single force
C. may be replaced by a single force through C.G. of the body
D. may be replaced by a couple

4. Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by
A. its longer side"
B. its shorter side"
C. the diagonal of the parallelogram which does not pass through the point of intersection of the forces"
D. the diagonal of the parallelogram which passes through the point of intersection of the forces"

5. The resultant of two forces P and Q acting at an angle 0, is
A. P2 + Q2 + 2P sin 0
B. P2 + Q2 + 2PQ cos 0
C. P2 + Q2 + 2PQ tan 0
D.P2+ Q2 + 2PQ cos 0

6. If the resultant of two forces P and Q acting at an angle 0 makes an angle a with P, then tan a equals P sin 0 Q sin 0
A. P - Q cos 0
B. P + Q cos 0 P sin 0
C. Q sin 0
D. P + Q tan 0 Q+Psin 0

7. If two equal forces of magnitude P act at an angle 0, their resultant, will be
A. P cos 0/2
B. 2P in 0/2
C. P tan 0/2
D. 2P cos 0/2

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