- ASpherical symmetry.
- BCylindrical symmetry.
- CCubical symmetry.
- DUnsymmetrical.
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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 |
Bohr's atom model assumes
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(a) The nucleus is of infinite mass and is at rest |
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(b) Electrons in a quantized orbit will not radiate energy |
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(c) Mass of electron remains constant |
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(d) All the above conditions |
A point source of light is placed in front of a plane mirror:
Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased.
Reason : On increasing temperature, conductivity of metallic wire decreases.
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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. |
In an electromagnetic wave, the electric and magnetising fields are 100 and
The maximum energy flow is
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(a) |
(b) |
(c) |
(d) |
If the energy of the photon is increased by a factor of 4, then its momentum
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(a) Does not change |
(b) Decreases by a factor of 4 |
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(c) Increases by a factor of 4 |
(d) Decreases by a factor of 2 |
Which of the following statement is not the true
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(a) While taking reading of tangent galvanometer, the plane of the coil must be set at right angles to the earth’s magnetic meridian |
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(b) A short magnet is used in a tangent galvanometer since a long magnet would be heavy and may not easily move |
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(c) Measurements with the tangent galvanometer will be more accurate when the deflection is around 45o |
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(d) A tangent galvanometer can not be used in the polar region |