Dimond is very hard because
it is covalent solid
it has large cohesive energy
high melting point
insoluble in all solvants
A transistor is operated in common emitter configuration at constant collector voltage Vc=1.5V such that a change in the base current from 100 to 150 produces a change in the collector current from 5mA to 10 mA. The current gain () is
67
75
100
50
In a common- base configuration of transistor will be , then current gain in common emitter configuration of transistor will be
49
98
4.9
24.5
At absolute zero, Si acts as
non-metal
metal
insulator
None of these
A p-n junction is said to be forward biased, when :
the positive pole of the battery is joined to the n-semiconductor and negative pole to the n-semiconductor
the positive pole of the battery is joined to the n-semiconductor and negative pole to the p-semiconductor
the positive pole of the battery is connected to n-semiconductor and p-semiconductor
a mechanical forces is applied in the forward direction
When a triode is used as an amplifier the phase difference between the input signal voltage and the output is
zero
The following truth table belongs to which of the following four gates?
NOR
XOR
NAND
OR
Which of the following when added as an impurity into silicon produces n-type semiconductor?
P
Al
B
Mg
A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency f. If L is doubled and C is changed to 4 C, the frequency will be :
