- ANuclear force
- ✓Coulomb's force
- C(a) and (b)
- DGravitational force
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The equivalent quantity of mass in electricity is
|
(a) Charge |
(b) Potential |
(c) Inductance |
(d) Current |
A ray of light is incident at 50° on the middle of one of the two mirrors arranged at an angle of 60° between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of
|
(a) 50° |
(b) 60° |
(c) 70° |
(d) 80° |
The resistance of a wire is per metre. It is bend in the form of a circle of diameter 2 m. A wire of the same material is connected across its diameter. The total resistance across its diameter AB will be
|
(a) |
(b) |
(c) 0.88 |
(d) 14π |
A person cannot see objects clearly beyond 2.0 m. The power of lens required to correct his vision will be
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(a) + 2.0 D |
(b) – 1.0 D |
(c) + 1.0 D |
(d) – 0.5 D |
Assertion : A current I flows along the length of an infinitely long straight and thin walled pipe. Then the magnetic field at any point inside the pipe is zero.
Reason :
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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. |
A current i passes through a wire of length l, radius of cross-section r and resistivity r. The rate of heat generation is
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(a) |
(b) |
(c) |
(d) ilρ/r |
The photo-electrons emitted from a surface of sodium metal are such that
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(a) They all are of the same frequency |
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(b) They have the same kinetic energy |
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(c) They have the same de Broglie wavelength |
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(d) They have their speeds varying from zero to a certain maximum |