Question
The process of adding impurities to the pure semiconductor is called
|
(a) Drouping |
(b) Drooping |
(c) Doping |
(d) None of these |
✓
Answer
(c) Doping
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Coherent sources are obtained in the use of double prism experiment :
Assertion : The cloud in sky generally appear to be whitish.
Reason : Diffraction due to cloud is efficient in equal measure at all wavelengths.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(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. |
|
(d) If the assertion and reason both are false. |
Identify the type of materials which develop electric currents in them, when an electric field is applied.
When light falls on a metal surface, the maximum kinetic energy of the emitted photo-electrons depends upon
|
(a) The time for which light falls on the metal |
|
(b) Frequency of the incident light |
|
(c) Intensity of the incident light |
|
(d) Velocity of the incident light |
If the luminous intensity of a 100 W unidirectional bulb is 100 candela, then total luminous flux emitted from the bulb is
|
(a) 861 lumen |
(b) 986 lumen |
(c) 1256 lumen |
(d) 1561 lumen |
The amount of heat produced in a resistor when a current is passed through it can be found using
|
(a) Faraday’s Law |
(b) Kirchhoff’s Law |
(c) Laplace’s Law |
(d) Joule’s Law |
An electron is accelerated through a p.d. of 45.5 volt. The velocity acquired by it is (in ms-1)
|
(a) 4 |
(b) 4 |
(c) |
(d) Zero |
When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of:
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then
|
(a) The resistance will be doubled and the specific resistance will be halved |
|
(b) The resistance will be halved and the specific resistance will remain unchanged |
|
(c) The resistance will be halved and the specific resistance will be doubled |
|
(d) The resistance and the specific resistance, will both remain unchanged |
A positively charged particle projected towards east is deflected towards north by a magnetic field. The field may be: