1 |
Radio waves of constant amplitude can be generated with |
Rectifier
Filter
FET
Oscillator
|
2 |
Copper and germanium are cooled to 70 K from room temperature then |
Resistance of copper increases while that of germanium decreases
Resistance of copper decreases while that of germanium increases
Resistance of both decreases
Resistance of both increases
|
3 |
When n-type of semiconductor is heated |
Number of electrons increases while that of holes decreases
Number of holes increases while that of electrons decreases
Number of electrons and holes remains same
Number of electrons and holes increases equally
|
4 |
The part of a transistor which is heavily doped to produce large number of majority carriers is |
Emitter
Base
Collector
Any of the above depending on nature of transistor.
|
5 |
A p-n junction has a thickness of the order of |
1 cm
1 mm
10<sup>-6</sup> cm
10<sup>-12</sup> cm
|
6 |
When boron is added as an impurity to silicon the resulting material is |
n type conductor
n type semiconductor
p-type conductor
p-type semiconductor
|
7 |
When we apply reverse bias to a junction diode it |
Lowers the potential barrier
Raises the potential barrier
Increase the majority carrier current
Decrease the majority carrier current
|
8 |
In a common base transistor circuit the current gain is 0.98.On changing the emitter current by 5.00 mA, the change in collector current is: |
0.196 mA
2.45 mA
4.9 mA
5.1 mA
|