A vacant or partially filled band is called _____________________?

A. Conduction band
B. Valence band
C. Forbidden band
D. Empty band

The electrons in conduction band are free to___________________?

A. Transport vibrations
B. Transport signals
C. Transport charge
D. Transport impulses

Many of the semi conductors are crystals of the type__________________?

A. Face centred cubic
B. Body centred cubic
C. Simple cubic
D. All of the above

Holes can exist in____________________?

A. Conductors
B. Insulators
C. Semi conductors
D. All of the above

In a semiconductors the charge carriers are ___________________?

A. Holes only
B. Electrons only
C. Electron and holes both
D. All of the above

The net charge on n-type material is____________________?

A. Positive
B. Negative
C. Both positive and negative
D. Neutral

Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?

A. Magnetic flux
B. Magnetic field intensity
C. Magnetic induction
D. Self inductance

A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________?

A. 0.025j
B. 0.50j
C. 0.75j
D. 0.100j

Materials that undergo plastic deformation before breaking are called __________________?

A. Brittle
B. Ductile
C. Amorphous
D. Polymers

A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ?

A. 2×108 nm-2
B. 5×106 nm-2
C. 0.5×10-6 nm-2
D. 0.2×10-6nm-2