Electromagnetic Waves — Physics STD 12 Science — Question

Light is:

1. Wave phenomenon.
2. Particle phenomenon
3. Both particle and wave phenomenon.

The peak voltage in a 220V AC source is:

Which of the following is an example of a molecule whose centre of mass of positive and negative charges coincide each other?

A beam consisting of protons and electrons moving at the same speed goes through a thin region in which there is a magnetic field perpendicular to the beam. The protons and the electrons:

A coil of inductance L is carrying a steady current i. What is the nature of its stored energy(a)  Magnetic(b)  Electrical(c)  Both magnetic and electrical(d)  Heat

Assertion   :  Coloured spectrum is seen when we look through a muslin cloth.
Reason       : It is due to the diffraction of white light on passing through fine slits.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

A p-type semiconductor is:

A particle moves on a straight line with a uniform velocity. Its angular momentum:

1. Is always zero.
2. Is zero about a point on the straight line.
3. Is not zero about a point away from the straight line.
4. About any given point remains constant.