When a plane polarised light is passed through an analyser and analyser is rotated through 90°, the intensity of the emerging light
|
(a) Varies between a maximum and minimum |
|
(b) Becomes zero |
|
(c) Does not vary |
|
(d) Varies between a maximum and zero |
(d) Varies between a maximum and zero
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A particle of charge -16 
coulomb moving with velocity 10 
along the x-axis enters a region where a magnetic field of induction B is along the y-axis, and an electric field of magnitude 
is along the negative z-axis. If the charged particle continues moving along the x-axis, the magnitude of B is
|
(a) |
(b) |
(c) |
(d) |
To an observer on the earth the stars appear to twinkle. This can be ascribed to
|
(a) The fact that stars do not emit light continuously |
|
(b) Frequent absorption of star light by their own atmosphere |
|
(c) Frequent absorption of star light by the earth's atmosphere |
|
(d) The refractive index fluctuations in the earth's atmosphere |
A rectangular tank of depth 8 meter is full of water (μ = 4/3), the bottom is seen at the depth
|
(a) 6 m |
(b) 8/3 m |
(c) 8 cm |
(d) 10 cm |
Two bulbs of equal wattage, one having carbon filament and the other having a tungsten filament are connected in series to the mains, then
|
(a) Both bulbs glow equally |
(b) Carbon filament bulb glows more |
|
(c) Tungsten filament bulbs glows more |
(d) Carbon filament bulb glows less |
A coil has an area of 0.05 m2 and it has 800 turns. It is placed perpendicularly in a magnetic field of strength 4 
, it is rotated through 90° in 0.1 sec. The average e.m.f. induced in the coil is
|
(a) 0.056 V |
(b) 0.046 V |
(c) 0.026 V |
(d) 0.016 V |
The sodium nucleus 
contains
|
(a) 11 electrons |
(b) 12 protons |
(c) 23 protons |
(d) 12 neutrons |
Two resistors whose value are in ratio 2 : 1 are connected in parallel with one cell. Then ratio of power dissipated is
|
(a) 2 : 1 |
(b) 4 : 1 |
(c) 1 : 2 |
(d) 1 : 1 |
