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
At absolute zero, Si acts as
non-metal
metal
insulator
None of these
When n-type semiconductor is heated
number of electrons increases while that of holes decreases
number of electrons and holes remain same
number of electrons and holes increases equally
When a triode is used as an amplifier the phase difference between the input signal voltage and the output is
zero
Phosphorus
Aluminium
Magnesium
Both (b) and (c)
Diamond is very hard because
it is covalent solid
it has large cohesive energy
high melting point
insoluble in all solvants
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
To obtain a p-type germanium semiconductor, it must be doped with
phosphorus
indium
antimony
arsenic
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
In a junction diode, the holes are due to
protons
extra electrons
neutrons
missing electrons
