The current gain for a transistor working as common base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is
To obtain a p-type germanium semiconductor, it must be doped with
phosphorus
indium
antimony
arsenic
The correct relationship between the two current gains and in a transistor is
When a triode is used as an amplifier the phase difference between the input signal voltage and the output is
zero
Sodium has body centred packing. If the distance between two nearest atoms is 3.7 Å, then the lattice parameter is
3.3 Å
3.9 Å
4.3 Å
4.8 Å
Diamond is very hard because
it is covalent solid
it has large cohesive energy
high melting point
insoluble in all solvants
Phosphorus
Aluminium
Magnesium
Both (b) and (c)
Transistors are
electrons - sensitive device
pressure - sensitive device
holes - sensitive device
temperature - sensitive device
Sodium has body centred packing. Distance between two nearest atoms is 3.7Å. The lattice parameter is
6.8Å
4.3Å
3.0Å
8.6Å
A semiconducting device is connected in a series in circuit with a battery and a resistance. A current is allowed to pass through the circuit. If the polarity of the battery is reversed, the current drios to almost zero. The device may be
a p-n junction
an intrinsic semiconductor
a p-type semiconductor
an n-type semiconductor