Energy needed to magnetize and demagnetize is represented by
A. Hysteresis curve
B. Hysteresis loop area
C. Hysteresis loop
D. Straight line
Energy needed to magnetize and demagnetize is represented by Read More »
Physics
Very weak magnetic fields are detected by
A. Squids
B. Magnetic resonance imaging (MRI)
C. Magnetometer
D. Oscilloscope
Very weak magnetic fields are detected by Read More »
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
On the basis of band theory of solids the semiconductors have Read More »
With increase in temperature the electrical conductivity of intrinsic semi conductor
A. Decreases
B. Increases
C. Remains same
D. First increases then decreases
With increase in temperature the electrical conductivity of intrinsic semi conductor Read More »
Which one has the greatest energy gap ?
A. Semi conductor
B. Conductor
C. Metals
D. Non metals
Which one has the greatest energy gap ? Read More »
A completely filled band is called
A. Conduction band
B. Valence band
C. Forbidden band
D. Core band
A completely filled band is called Read More »
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 band theory of solids explains satisfactorily the nature of Read More »
If the density of atoms remain same along any direction in a crystal is called
A. Symmetry
B. Homogeneity
C. Isotropy
D. Cleavage
If the density of atoms remain same along any direction in a crystal is called Read More »
The angular position of cells remains the same for a sample of a crystal. This property is called
A. Isotropy
B. Cleavage
C. Homogeneity
D. The external symmetry of form
Materials in which valence electrons are tightly bound to their atoms at low temperature are called
A. Semi conductor
B. Super conductors
C. Insulators
D. Conductor