A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be
|
(a) 99995 |
(b) 9995 |
(c) |
(d) |
(b) 9995
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Two magnets A and B are identical in mass, length and breadth but have different magnetic moments. In a vibration magnetometer, if the time period of B is twice the time period of A. The ratio of the magnetic moments 
of the magnets will be
| (a) 1/2 | (b) 2 | (c) 4 | (d) 1/4 |
A planet which is born sister of earth is
|
(a) Mercury |
(b) Venus |
(c) Mars |
(d) Jupiter |
A 25 W, 220 V bulb and a 100 W, 220 V bulb are connected in parallel across a 440 V line
|
(a) Only 100 watt bulb will fuse |
(b) Only 25 watt bulb will fuse |
|
(c) Both bulbs will fuse |
(d) None of the bulbs will fuse |
If the operating potential of an X-ray tube is 50 kV, the velocity of X-rays coming out of it is
|
(a) 4 |
(b) 3 |
(c) |
(d) 3 m/s |
The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be
|
(a) 2900 Å |
(b) 2500 Å |
(c) 5380 Å |
(d) 2000 Å |
The angle of dip at the magnetic equator is
| (a) 0° | (b) 45° | (c) 30° | (d) 90° |
