The equivalent resistance and potential difference between A and B for the circuit is respectively
|
(a) 4 W, 8 V |
(b) 8 W, 4 V |
(c) 2 W, 2 V |
(d) 16 W, 8 V |
(a) 4 W, 8 V
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An ideal transformer has 500 and 5000 turn in primary and secondary windings respectively. If the primary voltage is connected to a 6V battery then the secondary voltage is
|
(a) 0 |
(b) 60 V |
(c) 0.6 V |
(d) 6.0 V |
Consider the following two statements
A. Energy spectrum of a-particles emitted in radioactive decay is discrete
B. Energy spectrum of b-particles emitted in radioactive decay is continuous
|
(a) Only A is correct |
(b) Only B is correct |
|
(c) A is correct but B is wrong |
(d) Both A and B are correct |
Assertion : The threshold frequency of photoelectric effect supports the particle nature of sunlight.
Reason : If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The antenna current of an AM transmitter is 8 A when only carrier is sent but increases to 8.96 A when the carrier is sinusoidally modulated. The percentage modulation is
|
(a) 50% |
(b) 60% |
(c) 65% |
(d) 71% |
Cathode rays are produced when the pressure is of the order of
|
(a) 2 cm of Hg |
(b) 0.1 cm of Hg |
(c) 0.01 mm of Hg |
(d) 1 μm of Hg |
A coil has 1,000 turns and 500 cm2 as its area. The plane of the coil is placed at right angles to a magnetic induction field of 2
. The coil is rotated through 180° in 0.2 seconds. The average e.m.f. induced in the coil, in milli-volts, is
|
(a) 5 |
(b) 10 |
(c) 15 |
(d) 20 |
A cut diamond sparkles because of its
|
(a) Hardness |
(b) High refractive index |
|
(c) Emission of light by the diamond |
(d) Absorption of light by the diamond |