A light has amplitude A and angle between analyser and polariser is 60°. Light is reflected by analyser has amplitude
|
(a) A |
(b) A/ |
(c) |
(d) A/2 |
(d) A/2
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A homogeneous electric field E and a uniform magnetic field 
are pointing in the same direction. A proton is projected with its velocity parallel to 
. It will
|
(a) Go on moving in the same direction with increasing velocity |
|
(b) Go on moving in the same direction with constant velocity |
|
(c) Turn to its right |
|
(d) Turn to its left |
A plano-convex lens is made of refractive index of 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
|
(a) 400 cm |
(b) 200 cm |
(c) 100 cm |
(d) 50 cm |
Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is
|
(a) 4 |
(b) |
(c) 2 |
(d) |
The true statement is
|
(a) The order of colours in the primary and the secondary rainbows is the same |
|
(b) The intensity of colours in the primary and the secondary rainbows is the same |
|
(c) The intensity of light in the primary rainbow is greater and the order of colours is the same than the secondary rainbow |
|
(d) The intensity of light for different colours in primary rainbow is greater and the order of colours is reverse than the secondary rainbow |
The oscillating electric and magnetic vectors of an electromagnetic wave are oriented along
|
(a) The same direction but differ in phase by 90° |
|
(b) The same direction and are in phase |
|
(c) Mutually perpendicular directions and are in phase |
|
(d) Mutually perpendicular directions and differ in phase by 90° |
Assertion : Magnetic flux can produce induced e.m.f.
Reason : Faraday established induced e.m.f. experimentally.
|
(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 assertion is false but reason is true. |
Find out the value of current through 2Ω resistance for the given circuit
|
(a) 5 A |
(b) 2 A |
(c) Zero |
(d) 4 A |
