Physics interview questions – page 2

The stopping potential of a metal surface is independent of

1. frequency of incident radiation
2. velocity of the electrons emitted
3. the nature of the metal surface
4. intensity of incident radiation

Work function of a photo metal is defined as the minimum amount of _____ required to liberate an electron from the metal surface.

1. intensity
2. potential
3. frequency
4. energy

The important function of a transistor is

1. amplification
2. electrification
3. rectification
4. none of the above

Logic gates are _____ in nature.

1. octal
2. unary
3. binary
4. ternary

The outermost partially filled energy level is called

1. valency electrons
2. core electrons
3. conduction electrons
4. none of the above

OR and AND gate have

1. one or more input but only one output
2. two or more input and two outputs
3. one or more input and two outputs
4. two or more input but only one output

Logic gate is a digital circuit with

1. one or more input and one or more output
2. one or more input and one output
3. one input and one or more output
4. one input and one output

In P-type semiconductor, majority charge carries are

1. protons
2. electrons
3. neutrons
4. holes

In N-type semiconductor, majority charge carriers are

1. electrons
2. neutrons
3. protons
4. holes

The resistance of a semiconductor _____ in temperature.

1. decrease with decrease
2. decrease with increase
3. increases with decrease
4. increase with increase

Base current is usually measured in

1. nanoamperes
2. amperes
3. milliamperes
4. microamperes

Which of the following theories explains photoelectric effect?

1. Quantum theory
2. Electromagnetic theory
3. Wave theory
4. Corpuscular theory

Who discovered photoelectric effect?

1. Hallwachs
2. Heinrich Hertz
3. Elster
4. Geitel

Who applied quantum theory of radiation to photoelectric effect?

1. Albert Einstein
2. Maxwell
3. Millikan
4. Max Planck

Energy of the incident photon =

1. Work function + Kinetic energy of the electron
2. Work function + Kinetic energy of the proton
3. Potential energy + Kinetic energy of the proton
4. Potential energy + Kinetic energy of the electron

Who propounded the special theory of relativity?

1. Max Planck
2. Einstein
3. Morley
4. Michelson

Before the Second World War _____ were used in the process of electrical signal generation, amplification and transmission.

1. semiconducting materials
2. integrated circuits
3. vacuum tubes
4. transistors

Dopants are

1. liquid atoms
2. gaseous atoms
3. pure atoms
4. impurity atoms

The colour of light emitted by a LED depends on

1. its reverse bias
2. its forward bias
3. type of semiconductor material
4. the amount of forward current

A TRUTH TABE represents all possible

1. inputs of a logic circuit
2. symbols of a logic circuit
3. outputs of a logic circuit
4. inputs and outputs of a logic circuit

The colour of the light emitted by the LED will depend upon

1. the temperature at which it is operated
2. the voltage at which it is operated
3. the type of the semiconducting material used
4. none of the above

The energy of S or P level is of the order of

1. ev
2. MeV
3. mev
4. GeV

Zener diode is exclusively operated in the

1. active region
2. saturation region
3. breakdown region
4. cut in region

Forbidden energy gap is absent in

1. insulators
2. conductors
3. semiconductors
4. all the above

The resistivity of semiconductor

1. lies between conductors and insulators
2. is equal to zero
3. less than that of insulators
4. is greater than that of conductors

The device which converts alternating current into direct current is called

1. alternator
2. converter
3. transformer
4. rectifier

______ is applied to the operation of computer devices.

1. Modern algebra
2. Vector algebra
3. Boolean algebra
4. None of the above

_____ are used as regulators.

1. Zener diodes
2. Voltage stabilizer
3. LED’s
4. LCD’s

The electrons in the atom of an element which determine its chemical and electrical properties are called

1. active electrons
2. excess electrons
3. revolving electrons
4. valence electrons

The frequency maintaining device of the sinusoidal oscillator is

1. a transistor oscillator
2. zener diode
3. a transistor amplifier
4. none of the above