Calculate the equivalent resistance between A and B
|
(a) |
(b) 3 W |
(c) 6 W |
(d) |
Calculate the equivalent resistance between A and B
|
(a) |
(b) 3 W |
(c) 6 W |
(d) |
(a) W
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Two charge + q and -q are situated at a certain distance. At the point exactly midway between them
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(a) Electric field and potential both are zero |
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(b) Electric field is zero but potential is not zero |
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(c) Electric field is not zero but potential is zero |
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(d) Neither electric field nor potential is zero |
If the operating potential of an X-ray tube is 50 kV, the velocity of X-rays coming out of it is
|
(a) 4 |
(b) 3 |
(c) |
(d) 3 m/s |
Two infinitely long parallel wires carry equal current in same direction. The magnetic field at a mid point in between the two wires is
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(a) Twice the magnetic field produced due to each of the wires |
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(b) Half of the magnetic field produced due to each of the wires |
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(c) Square of the magnetic field produced due to each of the wires |
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(d) Zero |
A man cannot see clearly the objects beyond a distance of 20 cm from his eyes. To see distant objects clearly he must use which kind of lenses and of what focal length
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(a) 100 cm convex |
(b) 100 cm concave |
(c) 20 cm convex |
(d) 20 cm concave |
If in Rutherford’s experiment, the number of particles scattered at 90° angle are 28 per min, then number of scattered particles at an angle 60° and 120° will be
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(a) 112/min, 12.5/min |
(b) 100/min, 200/min |
(c) 50/min, 12.5/min |
(d) 117/min, 25/min |
Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50 V is amplitude modulated by sinusoidal voltage of frequency 10 kHz producing 50% modulation. The lower and upper side-band frequencies in kHz are
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(a) 1490, 1510 |
(b) 1510, 1490 |
(c) |
(d) |