No work is done by a force if the body:

1. moves in the direction of force
2. does not move
3. moves in opposite direction
4. none of these

Two coolies A and B do some work in time 1 minute and 2 minute respectively. The power spent is:

1. same by both coolies
2. is more by coolie A than by B
3. is less by coolie A than by B
4. nothing can be said

1 H.P. is equal to:

1. 1 W
2. 1 J
3. 764 J
4. 746 W

When a boy doubles his speed, his kinetic energy becomes:

1. half
2. double
3. four times
4. no change