Atoms — Physics STD 12 Science — Question

When an electron jumps from its orbit to another orbit, energy is:

Heavy stable nucle have more neutrons than protons. This is because of the fact that:

Assertion :   Intensity of X-rays can be controlled by adjusting the filament current and voltage.
Reason     : The intensity of X-rays does not depend on number of X-ray photons emitted per second from the target.(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.

When a hydrogen atom is raised from the ground state to an excited state(a) P.E. increases and K.E. decreases(b) P.E. decreases and K.E. increases(c) Both kinetic energy and potential energy increase(d) Both K.E. and P.E. decrease

The internal resistance of dry cell is ...A..., than the internal resistance of common electrolytic cell. Here, A refers to:

The intensity of the field generated at a point due to an electric dipole is directly proportional to:

For a material, the refractive indices for red, violet and yellow colour light are respectively 1.52, 1.64 and 1.60. The dispersive power of the material is(a) 2  (b) 0.45(c) 0.2(d) 0.045

Demagnetisation of magnets can be done by(a) Rough handling(b) Heating(c) Magnetising in the opposite direction(d) All the above