What is the SI unit of modulus of elasticity of substance ?
(A) Nm-2
(B) Jm-2
(C) Nm-1
(D) Being a number it has no unit.
Energy needed to magnetize and demagnetize is represented by _________________?
(A) Hysteresis curve
(B) Hysteresis loop area
(C) Hysteresis loop
(D) Straight line
Very weak magnetic fields are detected by___________________?
(A) Squids
(B) Magnetic resonance imaging (MRI)
(C) Magnetometer
(D) Oscilloscope
On the basis of band theory of solids the semiconductors have _____________________?
(A) A party filled valence band and totally empty conduction band
(B) A completely filled valence band a totally empty conduction band and a very wide forbidden band
(C) A completely filled valence band a partially filled conduction band and a narrow forbidden band
(D) A partly filled valence band a totally empty conduction band and a wide forbidden band
With increase in temperature the electrical conductivity of intrinsic semi conductor___________________?
(A) Decreases
(B) Increases
(C) Remains same
(D) First increases then decreases
A completely filled band is called__________________?
(A) Conduction band
(B) Valence band
(C) Forbidden band
(D) Core band
The band theory of solids explains satisfactorily the nature of_________________?
(A) Electrical insulators alone
(B) Electrical conductors alone
(C) Electrical semi conductors alone
(D) All of the above
The electrons in conduction band are free to___________________?
(A) Transport vibrations
(B) Transport signals
(C) Transport charge
(D) Transport impulses
A vacant or partially filled band is called _____________________?
(A) Conduction band
(B) Valence band
(C) Forbidden band
(D) Empty band