When a PN junction diode is reverse biased
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(a) Electrons and holes are attracted towards each other and move towards the depletion region |
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(b) Electrons and holes move away from the junction depletion region |
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(c) Height of the potential barrier decreases |
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(d) No change in the current takes place |
(b) Electrons and holes move away from the junction depletion region
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In a full wave rectifiers, input ac current has a frequency ‘n’. The output frequency of current is
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(a) n/2 |
(b) n |
(c) 2n |
(d) None of these |
An air core solenoid has 1000 turns and is one metre long. Its cross-sectional area is 10 cm2. Its self inductance is
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(a) 0.1256 mH |
(b) 12.56 mH |
(c) 1.256 mH |
(d) 125.6 mH |
Assertion : Magnetism is relativistic.
Reason : When we move along with the charge so that there is no motion relative to us, we find no magnetic field associated with the charge.
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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. |
A 60 watt bulb carries a current of 0.5 amp. The total charge passing through it in 1 hour is
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(a) 3600 coulomb |
(b) 3000 coulomb |
(c) 2400 coulomb |
(d) 1800 coulomb |
The effective resistance between points A and B is
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(a) 10 Ω |
(b) 20 Ω |
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(c) 40 Ω |
(d) None of the above three values |
Beta rays emitted by a radioactive material are
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(a) Electromagnetic radiation |
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(b) The electrons orbiting around the nucleus |
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(c) Charged particles emitted by nucleus |
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(d) Neutral particles |
The electric field due to a uniformly charged sphere of radius R as a function of the distance from its centre is represented graphically 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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