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Eddy currents are produced when
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(a) A metal is kept in varying magnetic field |
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(b) A metal is kept in the steady magnetic field |
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(c) A circular coil is placed in a magnetic field |
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(d) Through a circular coil, current is passed |
Two resistances of 400 W and 800 W are connected in series with 6 volt battery of negligible internal resistance. A voltmeter of resistance 10,000 W is used to measure the potential difference across 400 W. The error in the measurement of potential difference in volts approximately is
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(a) 0.01 |
(b) 0.02 |
(c) 0.03 |
(d) 0.05 |
In 
nucleus, there are
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(a) 138 protons and 88 neutrons |
(b) 138 neutrons and 88 protons |
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(c) 226 protons and 88 electrons |
(d) 226 neutrons and 138 electrons |
The electrons are emitted in the photoelectric effect from a metal surface
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(a) Only if the frequency of the incident radiation is above a certain threshold value |
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(b) Only if the temperature of the surface is high |
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(c) At a rate that is independent of the nature of the metal |
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(d) With a maximum velocity proportional to the frequency of the incident radiation |
When the current change from + 2A to – 2A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is
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(a) 0.1 H |
(b) 0.2 H |
(c) 0.4 H |
(d) 0.8 H |
The dependence of binding energy per nucleon, 
on the mass number, A, is represented by
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(a)
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(b)
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(C)
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(d)
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If you are provided three resistances 2 W, 3 W and 6 W. How will you connect them so as to obtain the equivalent resistance of 4 W
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(a)
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(b)
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(c)
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(d) None of these |
