- A1.
- B2.
- C3.
- D4.
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On a glass plate a light wave is incident at an angle of 60°. If the reflected and the refracted waves are mutually perpendicular, the refractive index of material is
|
(a) |
(b) |
(c) |
(d) |
If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be
|
(a) 9 : 4 |
(b) 4 : 3 |
(c) 3 : 8 |
(d) 3 : 2 |
In hydrogen atom, electron makes transition from n=4 to n=1 level. Recoil momentum of the H atom will be
|
(a) 3.4 |
(b) 6.8 |
|
(c) 3.4 |
(d) 6.8 |
The electric intensity due to a dipole of length 10 cm and having a charge of 500μC, at a point on the axis at a distance 20 cm from one of the charges in air, is
|
(a) 6.25 |
(b) 9.28 |
(c) 13.1 |
(d) |
The decay constant of radium is 4.28
per year. Its half life will be
|
(a) 2000 years |
(b) 1240 years |
(c) 63 years |
(d) 1620 years |
Heat produced in a wire of resistance R due to current flowing at constant potential difference is proportional to
|
(a) |
(b) |
(c) R |
(d) |