If
what is the temperature of inversion
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(a) - |
(b) + |
(c) - |
(d) + |
If
what is the temperature of inversion
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(a) - |
(b) + |
(c) - |
(d) + |
(a) -
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Assertion : For the scattering of a-particles at a large angles, only the nucleus of the atom is responsible.
Reason : Nucleus is very heavy in comparison to electrons.
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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. |
The figure below shows currents in a part of electric circuit. The current i is
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(a) 1.7 amp |
(b) 3.7 amp |
(c) 1.3 amp |
(d) 1 amp |
A wire carrying a current i is placed in a uniform magnetic field in the form of the curve y = asin
0 ≤ x ≤ 2L. The force acting on the wire is

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(a) |
(b) iBL |
(c) 2iBL |
(d) Zero |
A point source of light is placed at a distance, of 2f from a converging lens of focal length f. The intensity on the other side of the lens is maximum at a distance:
A concave lens and a convex lens have same focal length of 20 cm and both put in contact this combination is used to view an object 5 cm long kept at 20 cm from the lens combination. As compared to object the image will be
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(a) Magnified and inverted |
(b) Reduced and erect |
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(c) Of the same size and erect |
(d) Of the same size and inverted |
For a medium, refractive indices for violet, red and yellow are 1.62, 1.52 and 1.55 respectively, then dispersive power of medium will be
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(a) 0.65 |
(b) 0.22 |
(c) 0.18 |
(d) 0.02 |