A pure semiconductor behaves slightly as a conductor at
|
(a) Room temperature |
(b) Low temperature |
|
(c) High temperature |
(d) Both (b) and (c) |
A pure semiconductor behaves slightly as a conductor at
|
(a) Room temperature |
(b) Low temperature |
|
(c) High temperature |
(d) Both (b) and (c) |
(a) Room temperature
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Angle of dip is 90o at
|
(a) Poles |
(b) Equator |
(c) Both (a) and (b) |
(d) None of these |
Assertion : On going away from a point charge or a small electric dipole, electric field decreases at the same rate in both the cases.
Reason : Electric field is inversely proportional to square of distance from the charge or an electric dipole.
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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. |
|
(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
1 Curie is equal to
|
(a) 3 |
(b) 3.7 |
|
(c) 5 |
(d) 3.7 |
Light of different colours propagates through air
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(a) With the velocity of air |
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(b) With different velocities |
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(c) With the velocity of sound |
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(d) Having the equal velocities |
Wavelength of light of frequency 100Hz
|
(a) 2 |
(b) 3 |
(c) 4 |
(d) 5 |
Resistance of tungsten wire at 150℃ is 133 Ω . Its resistance temperature coefficient is 0.0045/℃. The resistance of this wire at 500 ℃ will be
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(a) 180 Ω |
(b) 225 Ω |
(c) 258 Ω |
(d) 317 Ω |
A cell of internal resistance r is connected to an external resistance R. The current will be maximum in R, if
|
(a) R = r |
(b) R < r |
(c) R > r |
(d) R = r/2 |
PQRS is a square loop made of uniform conducting wire the current enters the loop at P and leaves at S. Then the magnetic field will be

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(a) Maximum at the centre of the loop |
(b) Zero at the centre of loop |
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(c) Zero at all points inside the loop |
(d) Zero at all points outside of the loop |