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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If the light moving in a straight line bends by a small but fixed angle, it may be a case of:
In vacuum the speed of light depends upon
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(a) Frequency |
(b) Wave length |
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(c) Velocity of the source of light |
(d) None of these |
Which of the following is true for number of spectral lines in going form Layman series to Pfund series
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(a) Increases |
(b) Decreases |
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(c) Unchanged |
(d) May decreases or increases |
In a communication system, noise is most likely to affect the signal
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(a) At the transmitter |
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(b) In the channel or in the transmission line |
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(c) In the information source |
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(d) At the receiver |
The junction diode in the following circuit requires a minimum current of 1 mA to be above the knee point (0.7 V) of its I-V characteristic curve. The voltage across the diode is independent of current above the knee point. If VB = 5V, then the maximum value of R so that the voltage is above the knee point, will be
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(a) 4.3 kW |
(b) 860 kW |
(c) 4.3 W |
(d) 860 W |
When objects at different distances are seen by the eye, which of the following remain constant?
The intensity of magnetic field is H and moment of magnet is M. The maximum potential energy is
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(a) MH |
(b) 2 MH |
(c) 3 MH |
(d) 4 MH |
In a nuclear reaction, which of the following is conserved
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(a) Atomic number |
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(b) Mass number |
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(c) Atomic number, mass number and energy |
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(d) None of these |