Question # 1

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

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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 digital system deals with quantities which has discrete values:

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Two in number

One in number

Three in number

Four in number

None of these

If both the inputs given to a gate ae 1 such that the output is 0, then it is:

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AND gate

NOR gate

OR gate

NOT gate

Both (A) and (C)

The value of LDR depends upon intensity of:

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Sound falling on it

Current passing through it

Magnetic field surrounding it

Light falling on it

Non of these

The value of relative permittivity of different dielectrics are

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Equal

Different

Greater than one

Smaller than one

Both B and C

Truth table of logic function:

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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

Crystal of germanium or silicon in its pure form at absolute zero acts as:

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A conductor

A semiconductor

an insulator

Both (A) and (C)

Both (A) and (B)

In the text book, the transistor amplifier circuit is a:

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Common emitter circuit

Common collector circuit

Common base circuit

Any of these

None of these

Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

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

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Reftification

Amplification

Electric induction

Magnetic induction

None of these

All the valence electrons present in a crystal of silicon are bound in their orbits by

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Ionic bond

covalent bond

Molecular bond

Both (A) and (B)

Both (B) and (C)

Electric lines of force

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Intersect each other

Are always parallel

Are always anti-parallel

Never intersect

None of these

The electric field lines start from

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Positive charge

Negative charge

Either A or B

Neutron

An atom

Origin of the electric and the gravitational forces

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Was known in 1911 A.D.

Was known in 1811 A.D.

Was known in 1711 A.D.

is still unknown

Was known in 1611 A.D.

When transistors are used in digital circuits they usually operate in the

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Active region

Breakdown region

Saturation and cutoff regions

Linear region

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

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Double

Half

Three times

One fourth

One third

The SI unit of charge is

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Ampere

Watt

Coulomb

Volt

Joule

.Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

The reverse saturation current in a PN junction diode is only due to

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Majority carriers

Minority Carriers

Acceptor ions

Donor ions

Inverter is the name given to:

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NOT gate

OR gate

NOR gate

AND gate

XOR gate

Electric field lines emerge from the charges in

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of these

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

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Is always reduced

Is always increased

Is not affected

Is increased one million times

None of these

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

An LED emits light when it is:

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Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

The intensity at a point due to a charge is inversely proportional to

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Amount of charge

Size of the charge

Distance between charge and the point

Square of the distance from the charge

None of these

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

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Four

Five

Nine

Six

Seven

In full wave rectification, simultaneous action is that:

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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

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