A door lock is opened by turning the lever (handle) of length 0.2 m. If the moment of force produced is 1 Nm, then the minimum force required is:

1. 5 N
2. 10 N
3. 20 N
4. 0.2 N

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

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.

When the stem of vibrating tuning fork is pressed on a table, the tabletop starts vibrating. These vibrations are definitely an example of:

1. resonance
2. natural vibrations
3. forced vibrations
4. damped vibrations