- AMagnetic moment.
- BZEEMAN effect.
- CLight.
- DNuclear fission.
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An electric motor operating on a 60 V dc supply draws a current of 10 A. If the efficiency of the motor is 50%, the resistance of its winding is
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(a) 3Ω |
(b) 6 Ω |
(c) 15 Ω |
(d) 30 Ω |
To form a composite 16Μf, 1000 V capacitor from a supply of identical capacitors marked 8 μF, 250 V we require a minimum number of capacitors
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(a) 40 |
(b) 32 |
(c) 8 |
(d) 2 |
Assertion : If three capacitors of capacitance C1 < C2 < C3 are connected in parallel then their equivalent capacitance Cp > Cs
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. |
Which of the following statements about the Bohr model of the hydrogen atom is false
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(a) Acceleration of electron in n = 2 orbit is less than that in n = 1 orbit |
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(b) Angular momentum of electron in n = 2 orbit is more than that in n = 1 orbit |
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(c) Kinetic energy of electron in n = 2 orbit is less than that in n = 1 orbit |
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(d) Potential energy of electron in n = 2 orbit is less than that in n = 1 orbit |
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 |
The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to . The thickness of lead which will reduce the intensity to
will be
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(a) 18 mm |
(b) 12 mm |
(c) 6 mm |
(d) 9 mm |