Compton effect is associated with
| (a) α - rays | (b) β - rays | (c) X-rays | (d) Positive rays |
Compton effect is associated with
| (a) α - rays | (b) β - rays | (c) X-rays | (d) Positive rays |
(c) X-rays
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The 6563 Å line emitted by hydrogen atom in a star is found to be red shifted by 5 Å. The speed with which the star is receding from the earth is
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(a) 17.29 × 109 m/s |
(b) 4.29 × 107 m/s |
(c) 3.39 × 105 m/s |
(d) 2.29 × 105 m/s |
A ray of light is incident at 50° on the middle of one of the two mirrors arranged at an angle of 60° between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of
|
(a) 50° |
(b) 60° |
(c) 70° |
(d) 80° |
A current carrying solenoid is approaching a conducting loop as shown in the figure. The direction of induced current as observed by an observer on the other side of the loop will be

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(a) Anticlockwise |
(b) Clockwise |
(c) East |
(d) West |
Assertion : The surface wave propagation is used for medium wave band and for television broadcasting.
Reason : The surface waves travel directly from transmitting antenna to receiver antenna through atmosphere.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
If all the resistors shown have the value 2 ohm each, the equivalent resistance over AB is
|
(a) 2 ohm |
(b) 4 ohm |
(c) 1 |
(d) 2 |
The curve between current (i) and potential difference (V) for a photo cell will be
|
(a)
|
(b)
|
(c)
|
(d)
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When current flows through a conductor, then the order of drift velocity of electrons will be
|
(a) |
(b) |
(c) |
(d) |
A transmitter supplies 9 kW to the aerial when unmodulated. The power radiated when modulated to 40% is
|
(a) 5 kW |
(b) 9.72 kW |
(c) 10 kW |
(d) 12 kW |