Question # 1

Whenever a covalent bond breaks, it creates:

Choose an answer

An electron

A hole

An electron-hole pair

A positron

All of these

Electric field lines emerge from the charges in

Choose an answer

One dimension

Two dimensions

Three dimensions

Four dimensions

None of these

In describing function of digital systems, 1 represents:

Choose an answer

Closed switch

True Statement

Lighted bulb

Only (B) and (C)

All are true

By placing a dielectric in between the charges, the electrostatic force between them

Choose an answer

Is always reduced

Is always increased

Is not affected

Is increased one million times

None of these

An LED emits light when it is:

Choose an answer

Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

In reverse-biased p-n junction, the reverse current is due to flow of:

Choose an answer

Minority charge carriers

Majority charge carriers

Free electrons from p to n-region

Holes from n to p-region

all are true except (B)

A transistor has:

Choose an answer

One region

Two regions

Three regions

Four regions

None is correct

The value of relative permittivity of different dielectrics are

Choose an answer

Equal

Different

Greater than one

Smaller than one

Both B and C

Conversion of A.C. into D.C. is called:

Choose an answer

Reftification

Amplification

Electric induction

Magnetic induction

None of these

Improper biasing of a transistor circuit produces

Choose an answer

Heavy loading of emitter current

Distortion in the output signal

Excessive heat at collector terminal

Faulty location of load line

The value of LDR depends upon intensity of:

Choose an answer

Sound falling on it

Current passing through it

Magnetic field surrounding it

Light falling on it

Non of these

A digital system deals with quantities which has discrete values:

Choose an answer

Two in number

One in number

Three in number

Four in number

None of these

To turn the transistor OFF, the base current is set:

Choose an answer

At maximum value

At zero

Either (A) or (B)

All are correct

None of correct

The concept of electric field theory was introduced by

Choose an answer

Michael Faraday

Newton

Dalton

Kepler

Einstein

Michael Faraday is known by his work on

Choose an answer

Nuclear strong force

Gravitational force

Nuclear weak force

Electric force

None of these

To designate the voltage as low or 0 by a logic gate, the specified minimum value is:

Choose an answer

0.2 volt

0.8 volt

0 volt

2.0 volt

5.0 volt

Electric field strength is defined as

Choose an answer

Work done on unit charge

Force exerted on unit charge

Distance covered by unit charge

Power exerted by unit charge

None of these

To display a digit of EIGHT, the number of ON LED'S are:

Choose an answer

Two

Three

Five

Seven

Eight

The number of LED'S needed to display all the digits is:

Choose an answer

Four

Five

Nine

Six

Seven

Inverter is the name given to:

Choose an answer

NOT gate

OR gate

NOR gate

AND gate

XOR gate

Depletion region contains:

Choose an answer

Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

Silicon is one of the mot commonly used:

Choose an answer

onductor

Dielectric

Insulator

Semiconduction

Both (B) and (C)

In an N-type silicon, which of the following statement is true

Choose an answer

Electrons are majority carriers and trivalent atoms are the dopants

Electrons are minority carriers and pentavalent atoms are the dopants

Holes are minority carriers and pentavalent atoms are the dopants

Holes are majority carriers and trivalent atoms are the dopants

The SI unit of charge is

Choose an answer

Ampere

Watt

Coulomb

Volt

Joule

The use of chips in electrons is described in the form of:

Choose an answer

Yellow boxes

Black boxes

Red boxes

White boxes

Orange boxes

Electric lines of force

Choose an answer

Intersect each other

Are always parallel

Are always anti-parallel

Never intersect

None of these

If the distance between two charges is doubled, the force between them will become

Choose an answer

Double

Half

Three times

One fourth

One third

Truth table of logic function:

Choose an answer

Summarizes its output values

Tabulates all its input conditions only

Display all its input/output possibilites

Is not based on logic algebra

None of these

In full wave rectification, simultaneous action is that:

Choose an answer

Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

.Depletion region contains:

Choose an answer

Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

More Classes

Other Links

ECAT Pre General Science Physics Chapter 18 Electronics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer