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
Radio waves of constant amplitude can be generated with
FET
filter
rectifier
oscillator
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
Diamond is very hard because
it is covalent solid
it has large cohesive energy
high melting point
insoluble in all solvants
At absolute zero, Si acts as
non-metal
metal
insulator
None of these
emitter
base
collector
Any of the above depending upon the nature of transistor.
Transistors are
electrons - sensitive device
pressure - sensitive device
holes - sensitive device
temperature - sensitive device
Phosphorus
Aluminium
Magnesium
Both (b) and (c)
Which one of the following is the weakest kind of the bonding in solids?
Ionic
Metallic
Van der Waals'
Covalent
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
