A photon in motion has a mass
|
(a) c/hv |
(b) h/v |
(c) hv |
(d) |
A photon in motion has a mass
|
(a) c/hv |
(b) h/v |
(c) hv |
(d) |
(d)
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The coefficient of self inductance of a solenoid is 0.18 mH. If a crode of soft iron of relative permeability 900 is inserted, then the coefficient of self inductance will become nearly
|
(a) 5.4 mH |
(b) 162 mH |
(c) 0.006 mH |
(d) 0.0002 mH |
The capacities of two conductors are and
and their respective potentials are
and
. If they are connected by a thin wire, then the loss of energy will be given by
|
(a) |
(b) |
(c) |
(d) |
A radioactive nucleus undergoes a-emission to form a stable element. What will be the recoil velocity of the daughter nucleus if V is the velocity of a-emission and A is the atomic mass of radioactive nucleus
|
(a) |
(b) |
(c) |
(d) |
In a Young's double slit experiment, the fringe width will remain same, if (D = distance between screen and plane of slits, d = separation between two slits and λ = wavelength of light used)
|
(a) Both λ and D are doubled |
(b) Both d and D are doubled |
|
(c) D is doubled but d is halved |
(d) λ is doubled but d is halved |
A closely wound flat circular coil of 25 turns of wire has diameter of 10 cm and carries a current of 4 ampere. Determine the flux density at the centre of a coil
|
(a) 1.679 |
(b) 2.028 |
|
(c) 1.257 |
(d) 1.512 |

If 2.2kW power is transmitted through a 100Ω line at 22,000 V, the power loss in the form of heat will be
|
(a) 0.1 W |
(b) 1 W |
(c) 10 W |
(d) 100 W |