To convert a galvanometer into a voltmeter, one should connect a
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(a) High resistance in series with galvanometer |
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(b) Low resistance in series with galvanometer |
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(c) High resistance in parallel with galvanometer |
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(d) Low resistance in parallel with galvanometer |
(a) High resistance in series with galvanometer
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Consider three converging lenses L1, L2 and L3 having identical geometrical construction. The index of refraction of L1 and L2 are $\mu_1$ and $\mu_2$ respectively. The upper half of the lens L3 has a refractive index $\mu_1$ and the lower half has $\mu_2$. A point object O is imaged at O1 by the lens L1 and at O2 by the lens L2 placed in same position. If L3 is placed at the same place:
Assertion : A paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled.
Reason : The magnetisation does not depend on temperature.
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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 hydrogen atom, an electron is revolving in the orbit of radius 0.53
with 6.6 
rotations/second. Magnetic field produced at the centre of the orbit is
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(a) 0.125 |
(b) 1.25 |
(c) 12.5 |
(d) 125 |
The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then
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(a) After deviation it will emerge from the second refracting surface |
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(b) It is totally reflected on the second surface and emerges out perpendicularly from third surface in air |
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(c) It is totally reflected from the second and third refracting surfaces and finally emerges out from the first surface |
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(d) It is totally reflected from all the three sides of prism and never emerges out |
If a power of 100 W is being supplied across a potential difference of 200 V, current flowing is
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(a) 2 A |
(b) 0.5 A |
(c) 1 A |
(d) 20 A |
When light falls on a metal surface, the maximum kinetic energy of the emitted photo-electrons depends upon
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(a) The time for which light falls on the metal |
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(b) Frequency of the incident light |
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(c) Intensity of the incident light |
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(d) Velocity of the incident light |
