The process of adding impurities to the pure semiconductor is called
|
(a) Drouping |
(b) Drooping |
(c) Doping |
(d) None of these |
The process of adding impurities to the pure semiconductor is called
|
(a) Drouping |
(b) Drooping |
(c) Doping |
(d) None of these |
(c) Doping
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The figure shows a network of currents. The magnitude of currents is shown here. The current I will be

|
(a) 3 A |
(b) 9 A |
(c) 13 A |
(d) 19 A |
When radiation of wavelength
is incident on a metallic surface, the stopping potential is 4.8 volts. If the same surface is illuminated with radiation of double the wavelength, then the stopping potential becomes 1.6 volts. Then the threshold wavelength for the surface is
|
(a) 2 |
(b) 4 |
(c) 6 |
(d) 8 |

Assertion : Microwave communication is preferred over optical communication.
Reason : Microwaves provide large number of channels and band width compared to optical signals.
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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 wire of resistance R is divided in 10 equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be
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(a) 0.01 R |
(b) 0.1 R |
(c) 10 R |
(d) 100 R |
Assertion : Electric lines of force cross each other.
Reason : Electric field at a point superimpose to give one resultant electric field.
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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 assertion is false but reason is true. |