Through which character we can distinguish the light waves from sound waves
|
(a) Interference |
(b) Refraction |
(c) Polarisation |
(d) Reflection |
(c) Polarisation
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The electron in the beam of a television tube move horizontally from south to north. The vertical component of the earth's magnetic field points down. The electron is deflected towards
|
(a) West |
(b) No deflection |
(c) East |
(d) North to south |
The magnetic field at the centre of a circular coil of radius r carrying current I is 
. The field at the centre of another coil of radius 2 r carrying same current I is 
. The ratio 
is
|
(a) |
(b) 1 |
(c) 2 |
(d) 4 |
Huygen wave theory allows us to know
|
(a) The wavelength of the wave |
(b) The velocity of the wave |
|
(c) The amplitude of the wave |
(d) The propagation of wave fronts |
Electroplating does not help in
|
(a) Fine finish to the surface |
(b) Shining appearance |
|
(c) Metals to become hard |
(d) Protect metal against corrosion |
In Young's double slit experiment, the slits are 0.5 mm apart and interference pattern is observed on a screen placed at a distance of 1.0 m from the plane containing the slits. If wavelength of the incident light is 6000 Å, then the separation between the third bright fringe and the central maxima is
|
(a) 4.0 mm |
(b) 3.5 mm |
(c) 3.0 mm |
(d) 2.5 mm |
Resistance of semiconductor at 0 K is
|
(a) Zero |
(b) Infinite |
(c) Large |
(d) Small |
The wavelengths involved in the spectrum of deuterium 
are slightly different from that of hydrogen spectrum, because
|
(a) The attraction between the electr on and the nucleus is different in the two cases |
|
(b) The size of the two nuclei are different |
|
(c) The nuclear forces are different in the two cases |
|
(d) The masses of the two nuclei are different |
Kirchoff’s I law and II law of current, proves the
|
(a) Conservation of charge and energy |
|
(b) Conservation of current and energy |
|
(c) Conservation of mass and charge |
|
(d) None of these |
