A man is suffering from colour blindness for green colour. To remove this defect, he should use goggles of
|
(a) Green colour glasses |
(b) Red colour glasses |
|
(c) Smoky colour glasses |
(d) None of the above |
(d) None of the above
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A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum p and energy E, then
| (a) p = 0, E = 0 | (b) p ¹ 0, E ¹ 0 | (c) p ¹ 0, E = 0 | (d) p = 0, E ¹ 0 |
A step-up transformer operates on a 230 V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1 : 25. The current in the primary is
|
(a) 15 A |
(b) 50 A |
(c) 25 A |
(d) 12.5 A |
Two resistances 
and 
when connected in series and parallel with 120 V line, power consumed will be 25 W and 100 W respectively. Then the ratio of power consumed by to that consumed by will be
|
(a) 1 : 1 |
(b) 1 : 2 |
(c) 2 : 1 |
(d) 1 : 4 |
The angle of dip at a place is 40.6o and the intensity of the vertical component of the earth's magnetic field V = 6 
Tesla. The total intensity of the earth's magnetic field (I) at this place is
(a) 7 Tesla
|
(b) 6 Tesla
|
(c) 5 Tesla
|
(d) 9.2 |
A sphere of radius 1 cm has potential of 8000 V, then energy density near its surface will be
|
(a) 64 |
(b) 8 |
(b) 8 |
(d) 2.83 |
Which of the following statements are true about the magnetic susceptibility 
of paramagnetic substance
|
(a) Value of |
|
(b) |
|
(c) |
|
(d) |
The distance between the plates of a parallel plate condenser is 4mm and potential difference is 60 volts. If the distance between the plates is increased to 12mm, then
|
(a) The potential difference of the condenser will become 180 volts |
|
(b) The P.D. will become 20 volts |
|
(c) The P.D. will remain unchanged |
|
(d) The charge on condenser will reduce to one third |
