Light waves producing interference have their amplitudes in the ratio 3 : 2. The intensity ratio of maximum and minimum of interference fringes is
|
(a) 36 : 1 |
(b) 9 : 4 |
(c) 25 : 1 |
(d) 6 : 4 |
(c) 25 : 1
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A dip needle in a plane perpendicular to magnetic meridian will remain
| (a) Vertical | (b) Horizontal |
| (c) In any direction | (d) At an angle of dip to the horizontal |
When a 12 Ω resistor is connected with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is
|
(a) 24 Ω |
(b) 36 Ω |
(c) 48 Ω |
(d) 60 Ω |
Resistance of a voltameter is 2Ω, it is connected in series to a battery of 10 V through a resistance of 3Ω. In a certain time mass deposited on cathode is 1 gm. Now the voltameter and the 3Ω resistance are connected in parallel with the battery. Increase in the deposited mass on cathode in the same time will be
|
(a) 0 |
(b) 1.5 gm |
(c) 2.5 gm |
(d) 2 gm |
Two charges + 5μC and +10 μC are placed 20 cm apart. The net electric field at the mid-Point between the two charges is
|
(a) 4.5 |
|
(b) 4.5 |
|
(c) 13.5 |
|
(d) 13.5 |
The magnetic induction at a point P which is distant 4 cm from a long current carrying wire is 
. The field of induction at a distance 12 cm from the same current would be
|
(a) 3.33 |
(b) 1.11 |
(c) 3 |
(d) 9 |
The waves used in telecommunication are
|
(a) IR |
(b) UV |
(c) Microwave |
(d) Cosmic rays |
