When a bell fixed on a cycle rings, then the energy conversion that takes place is:

1. gravitational potential energy to sound energy
2. kinetic energy to sound energy
3. sound energy to electrical energy
4. sound energy to mechanical energy

A force ‘F’ moves a load from A to C as shown in the figure below. For the calculation of the work done, which of these lengths would you use as the displacement?

1. 3m
2. 4m
3. 5m
4. 7m

A radioactive nucleus containing 128 nucleons emits a β – particle. After β – emission the number of nucleons present in the nucleus will be :

1. 128
2. 129
3. 124
4. 127

Assertion (A) : Ultraviolet radiations are scattered more as compared to the microwave radiations.

Reason (R) : Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.

1. Both A and R are true.
2. A is true but R is false.
3. A is false but R is true.
4. Both A and R are false.