Solution:
As we apply electric field is applied across a semiconductor, the electrons in the conduction band acquire energy and get accelerated. They travel from lower energy level to higher energy level. While the holes in valence band travel from higher energy level to lower energy level, where they will be having more energy.
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A constant current i is passed through a resistor. Taking the temperature coefficient of resistance into account, indicate which of the plots shown in figure best represents the rate of production of thermal energy in the resistor
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(a) a |
(b) b |
(c) c |
(d) d |
In the figure a capacitor is filled with dielectrics. The resultant capacitance is
|
(a) |
(b) |
(c) |
(d) None of these |
Assertion : Light is produced in gases in the process of electric discharge through them at high pressure.
Reason : At high pressure electrons of gaseous atoms collide and reach and excited state.
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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. |
|
(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
In order to increase the angular magnification of a simple microscope, one should increase:
What is the coordination number of sodium ions in the case of sodium chloride structure
|
(a) 6 |
(b) 8 |
(c) 4 |
(d) 12 |
Which of the following statements is true for an N-type semi-conductor
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(a) The donor level lies closely below the bottom of the conduction band |
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(b) The donor level lies closely above the top of the valence band |
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(c) The donor level lies at the halfway mark of the forbidden energy gap |
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(d) None of above |
In the circuit, the reading of the ammeter is (assume internal resistance of the battery be zero)
|
(a) |
(b) |
(c) |
(d) 2 A |
