Electronic Devi...

_{A +  is equal to}

Hole is a vacancy or lack of an electron and can travel through the semiconductor material. It can

The total current in a semiconductor is

A p-type material is electrically 

In the case of metals the valence and conduction bands have

In n-type semiconductor the total number of conduction electrons n_e is due to the,

A radio or a TV set, which uses valves, do not operate immediately when it is switched on; whereas a set containing only transistors operates immediately because

Basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc are

Choose the false statement.

The principle of LASER action involves

Which of the following diodes is/are forward biased?

With a rise in temperature, the specific resistance of a semiconductor

For conduction in P-N junction, the biasing is

In the energy band diagram of the material shown below, the open circles and filled circles denote holes and electrons, respectively. The material is a/an

The energy gap between a valence band and a conduction band of a semiconductor is

A serious drawback of semiconductors is that

Which of the following statements is true for an n-type semiconductor?

At room temperature, the forbidden energy gap of a germanium crystal is about 

If a carrier wave of 1 kHz is used to a carry signal, the wavelength of transmitting signal is

NAND and NOR gates are called universal gates primarily because they

In the case of semiconductors the valence and conduction bands have

Motion of hole is a convenient way of describing

Choose the correct statement.

In a pure, or intrinsic, semiconductor, valence band holes and conduction-band electrons are always present

Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (E_g)_C, (E_g)_Si and (E_g)_Ge, respectively. Which of the following relationships is true in their case?

An n-type semiconductor is

doping of semiconductor is the process of

Which of the following properties does not characterise a semiconductor?

The given symbol represents a/an

In n-type semiconductor the fifth electron