If the angle between the applied force and the direction of motion of a body, is

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Question
If the angle between the applied force and the direction of motion of a body, is between 90� and 180�, the work done, is called
Options
A. virtual work
B. imaginary work
C. zero work
D. negative work.

Correct Answer

negative work.

Applied Mechanics problems

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1. Pick up the incorrect statement from the following. In case of suspension bridge due to rise in temperature,
Options
A. dip of the cable increases
B. length of the cable increases
C. dip of the cable decreases
D. none of the these.

2. The resultant of the forces acting on a body will be zero if the body
Options
A. rotates
B. moves with variable velocity in a straight line
C. moves along a curved path
D. does not move at all.

3. A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length
Options
A. must be decreased
B. must be increased
C. is not changed but weight of the bob is increased
D. is not changed but weight of the bob is decreased
E. none of these.

4. The characteristic of a couple, is :
Options
A. algebraic sum of forces, constituting a couple is zero
B. algebraic sum of moments of forces, constituting a couple, about any poin, is same
C. a couple can be balanced only by a couple but of opposite sense
D. a couple can be never the balanced by a single force
E. all the above.

6. A body is said to move with Simple Harmonic Motion if its acceleration, is
Options
A. always directed away from the centre, the point of reference
B. proportional to the square of the distance from the point of reference
C. proportional to the distance from the point of reference and directed towards it
D. inversely proportion to the distance from the point of reference
E. none of these.

10. A ball moving with a velocity of 5 m/sec impinges a fixed plane at an angle of 45� and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be
Options
A. 0.5 m/sec
B. 1.5 m/sec
C. 2.5 m/sec
D. 3.5 m/sec
E. 4.5 m/sec.

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