Thermal neutrons can cause fission in
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(a) |
(b) |
(c) |
(d) |
Thermal neutrons can cause fission in
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(a) |
(b) |
(c) |
(d) |
(a)
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If a photon has velocity c and frequency n, then which of following represents its wavelength
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(a) |
(b) |
(c) |
(d) hv |
Assertion : A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction.
Reason : The earth has only horizontal component of its magnetic field at the north poles.
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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. |
Which of the following is not an application of eddy currents
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(a) Induction furnace |
(b) Galvanometer damping |
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(c) Speedometer of automobiles |
(d) X-ray crystallography |
The capacitance of a metallic sphere will be 1μF, if its radius is nearly
|
(a) 9 km |
(b) 10 m |
(c) 1.11 m |
(d) 1.11 cm |
If a bar magnet of magnetic moment M is freely suspended in a uniform magnetic field of strength B, the work done in rotating the magnet through an angle θ is
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(a) MB(1- sinθ |
(b) MB sinθ |
(c) MB cosθ |
(d) MB(1 – cosθ) |
For driving a current of 2 A for 6 minutes in a circuit, 1000 J of work is to be done. The e.m.f. of the source in the circuit is
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(a) 1.38 V |
(b) 1.68 V |
(c) 2.04 V |
(d) 3.10 V |