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The energy levels of the hydrogen spectrum is shown in figure. There are some transitions A, B, C, D and E. Transition A, B and C respectively represent
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(a) First member of Lyman series, third spectral line of Balmer series and the second spectral line of Paschen series |
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(b) Ionization potential of hydrogen, second spectral line of Balmer series and third spectral line of Paschen series |
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(c) Series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series |
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(d) Series limit of Lyman series, second spectral line of Balmer series and third spectral line of Paschen series |
Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that
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(a) P and Q are conductors of different materials |
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(b) P is N-type semiconductor and Q is P-type semiconductor |
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(c) P is semiconductor and Q is conductor |
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(d) P is conductor and Q is semiconductor |
The maximum power drawn out of the cell from a source is given by (where r is internal resistance)
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(a) |
(b) |
(c) |
(d) |
A metal conductor of length 1m rotates vertically about one of its ends at angular velocity 5 radians per second. If the horizontal component of earth's magnetic field is 0.2 
, then the e.m.f. developed between the two ends of the conductor is
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(a) 5mV |
(b) 5 |
(c) 50 mV |
(d) 50 μV |
The image distance of an object placed 10 cm in front of a thin lens of focal length + 5 cm is
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(a) 6.5 cm |
(b) 8.0 cm |
(c) 9.5 cm |
(d) 10.0 cm |
Assertion : In the given circuit if lamp B or C fuses then light emitted by lamp A decreases.
Reason : Voltage on A 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. |
