Current Electricity — Physics STD 12 Science — Question

As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is(a) 1.51   (b) 13.6(c) 40.8   (d) 122.4

Dipole moment depends on _______?

Let p and E denote the linear momentum and energy of a photon. If the wavelength is decreased:

Which metal is used to make ferromagnets ?

Assertion :   Moon is seen as it partly reflects the sun light falling on it
Reason     :  Moon is a satellite of earth. It does not emit light of its own(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.

Kirchhoff ’s junction rule is a reflection of:

What is the induced dipole moment developed per unit volume of a dielectric when placed in an external electric field called?

Water is flowing in streamliries motion through a tube with its axis horizontal Consider two points A and B in the tube at the same horizontal level:

1. The pressures at A and B are equal for any shape of the tube.
2. The pressures are never equal.
3. The pressures are equal if the tube has a uniform cross section.
4. The pressures may be equal even if the tube has a nonuniform cross section.