Pushing a wall yield no work, then where is the energy of our hands transferred?

1. To the environment as friction.
2. To the wall as friction
3. To the environment and wall as heat
4. All of the above

When a ray of light travel from glass to air, then deviation of ray is

1. i - r
2. zero
3. r - i
4. 90°

What is ratio of force acting on a body while going upwards and downwards under the influence of earth's gravity?

1. 2
2. -1
3. 1
4. -2

Which of the following is the electrostatic unit of charge?

1. franklin
2. q/m².sec
3. becquerel
4. calorie