Which one of the following is the weakest kind of the bonding in solids?
Ionic
Metallic
Van der Waals'
Covalent
n-type semiconductor
p-type semiconductor
n-type conductor
insulator
Phosphorus
Aluminium
Magnesium
Both (b) and (c)
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. Distance between two nearest atoms is 3.7Å. The lattice parameter is
6.8Å
4.3Å
3.0Å
8.6Å
Transistors are
electrons - sensitive device
pressure - sensitive device
holes - sensitive device
temperature - sensitive device
The correct relationship between the two current gains and in a transistor is
The following truth table belongs to which of the following four gates?
NOR
XOR
NAND
OR
At absolute zero, Si acts as
non-metal
metal
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
