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If the potential difference applied across X-ray tube is V volts, then approximately minimum wavelength of the emitted X-rays will be
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(a) |
(b) |
(c) |
(d) |
A fuse wire with radius 1 mm blows at 1.5 amp. The radius of the fuse wire of the same material to blow at 3A will be
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(a) |
(b) |
(c) |
(d) |
A long copper tube of inner radius R carries a current i. The magnetic field B inside the tube is
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(a) |
(b) |
(c) |
(d) Zero |
Line spectrum was first of all theoretically explained by
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(a) Swan |
(b) Fraunhofer |
(c) Kirchoff |
(d) Bohr |
The resistance of a galvanometer is 25 ohm and it requires 50μA for full deflection. The value of the shunt resistance required to convert it into an ammeter of 5 amp is
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(a) 2.5 |
(b) 1.25 |
(c) 0.05 ohm |
(d) 2.5 ohm |
Two long parallel wires are at a distance 2d apart. They carry steady equal currents flowing out of the plane of the paper, as shown. The variation of the magnetic field B along the line XX’ is given by
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(a)
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(b)
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(c)
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(d)
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Which one of the following statements is correct
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(a) In vacuum, the speed of light depends upon frequency |
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(b) In vacuum, the speed of light does not depend upon frequency |
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(c) In vacuum, the speed of light is independent of frequency and wavelength |
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(d) In vacuum, the speed of light depends upon wavelength |
Assertion : Inductance coil are made of copper.
Reason : Induced current is more in wire having less resistance.
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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. |
