The output of a dynamo using a splitting commutator is
|
(a) dc |
(b) ac |
|
(c) Fluctuating dc |
(d) Half-wave rectified voltage |
The output of a dynamo using a splitting commutator is
|
(a) dc |
(b) ac |
|
(c) Fluctuating dc |
(d) Half-wave rectified voltage |
(c) Fluctuating dc
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A circular coil of diameter 7cm has 24 turns of wire carrying current of 0.75A. The magnetic moment of the coil is
|
(a) 6.9 |
(b) 2.3 |
|
(c) |
(d) |
The reason for shining of air bubble in water is
|
(a) Diffraction of light |
(b) Dispersion of light |
|
(c) Scattering of light |
(d) Total internal reflection of light |
Energy released in fusion of 1 kg of deuterium nuclei
|
(a) 8 |
(b) 6 |
(c) 2 |
(d) 8 |
A ray of light passes through four transparent media with refractive indices and
as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have
|
(a) |
(b) |
(c) |
(d) |
The impurity atom added to germanium to make it N-type semiconductor is
|
(a) Arsenic |
(b) Iridium |
(c) Aluminium |
(d) Iodine |
A convex mirror of focal length f forms an image which is times the object. The distance of the object from the mirror is
|
(a) (n – 1)f |
(b) |
(c) |
(d) (n + 1)f |
A milliammeter of range 10 mA has a coil of resistance 1 W. To use it as voltmeter of range 10 volt, the resistance that must be connected in series with it, will be
|
(a) 999 W |
(b) 99 W |
(c) 1000 W |
(d) None of these |