Armature current in dc motor will be maximum when
|
(a) Motor has acquired maximum speed |
(b) Motor has acquired intermediate speed |
|
(c) Motor has just started moving |
(d) Motor is switched off |
(c) Motor has just started moving
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The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line no. 5 arises from the transition from level B to A). The following spectral lines will also occur in the absorption spectrum
|
(a) 1, 4, 6 |
(b) 4, 5, 6 |
(c) 1, 2, 3 |
(d) 1, 2, 3, 4, 5, 6 |
The phenomenon of change in the _____of light when it passes from one transparent medium to another is refraction.
A magnet of magnetic moment M and pole strength m is divided in two equal parts, then magnetic moment of each part will be
|
(a) M |
(b) M/2 |
(c) M/4 |
(d) 2M |
$1$
$2$
$\sqrt{2}$
$\frac{1}{\sqrt{2}}.$
In a good conductor the energy gap between the conduction band and the valence band is
|
(a) Infinite |
(b) Wide |
(c) Narrow |
(d) Zero |
In the circuit shown, the point ‘B’ is earthed. The potential at the point ‘A’ is
|
(a) 14 V |
(b) 24 V |
(c) 26 V |
(d) 50 V |