The energy transformation taking place during photosynthesis in plants is:

1. heat to chemical
2. chemical to light
3. light to chemical
4. chemical to heat

The Velocity Ratio (VR) of a block and tackle system of two pulleys with the effort in the upward direction is:

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

When a blackened bulb thermometer is moved beyond the red region of the visible spectrum, there is a rapid rise in the temperature. This is due to the presence of :

1. Infrared radiations
2. Ultraviolet radiations
3. X-rays
4. Radio waves

A fast-moving cyclist stops pedalling on reaching a hilly track. If he continues to move with the acquired energy, then assuming no loss of energy:

1. his kinetic energy remains constant at all times.
2. his potential energy remains constant at all times.
3. his total mechanical energy continuously increases.
4. his total mechanical energy remains constant.