Atoms — Physics STD 12 Science — Question

Energy is stored in a capacitor in the form of:

When an unpolarized light of intensity  is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

(a) Zero

(b)

(c)

(d)

The self inductance L of a solenoid of length l and area of crosssection A, with a fixed number of turns N increases as:

The oscillating electric and magnetic vectors of an electromagnetic wave are oriented along:

If we express the energy of a photon in KeV and the wavelength in angstroms, then energy of a photon can be calculated from the relation

(a) E = 12.4 hv

(b) E = 12.4 h/

(c) E = 12.4/

(d) E = hv

A long straight wire carries an electric current of 2A. The magnetic induction at a perpendicular distance of 5m from the wire is

(a) 4

(b) 8

(c) 12

(d)  16

If a magnetic substance is kept in a magnetic field, then which of the following is thrown out

(a) Paramagnetic

(b) Ferromagnetic

(c) Diamagnetic

(d) Antiferromagnetic

 If the wavelength of electromagnetic radiation is doubled, what will happen to the energy of photons?

If intensity of incident light is increased in PEE then which of the following is true

(a) Maximum K.E. of ejected electron will increase

(b) Work function will remain unchanged

(c) Stopping potential will decrease

(d) Maximum K.E. of ejected electron will decrease

If distance between two magnetic poles of strength (1 A-m) is 1 metre, then magnitude of force acting between them is: