The number of atoms contained in a fcc unit cell of a mono atomic substance is:
1
2
4
6
Which is NOT true in case of an ideal gas?
It cannot be converted into a liquid.
There is no interaction between the molecules.
All molecules of the gas move with same speed.
At a given temperature, pV is proportional to the amount of the gas.
On doping Ge metal with a little of In or Ga, one gets:
p - type semiconductor
insulator
n - type semiconductor
rectifier
If a gas expands at constant temperature, it indicates that:
kinetic energy of molecules decrease.
pressure of the gas increases.
kinetic energy of molecules remains the same.
number of the molecules of gas increase.
A liquid can exist only:
between triple point and critical temperature.
at any temperature above the melting point.
between melting point and critical temperature.
between boiling and melting temperature.
