Question # 1

A potential barrier of 0.7V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

In a transistor, collector current is controlled by

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Collector voltage

Base current

Collector resistance

All of the above

Silicon is one of the mot commonly used:

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onductor

Dielectric

Insulator

Semiconduction

Both (B) and (C)

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 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

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)

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

Inverter is the name given to:

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NOT gate

OR gate

NOR gate

AND gate

XOR gate

Op-amp has been discussed as comparator of:

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Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

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.

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

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At maximum value

At zero

Either (A) or (B)

All are correct

None of correct

Whenever a covalent bond breaks, it creates:

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An electron

A hole

An electron-hole pair

A positron

All of these

A potential barrier of 0.7 V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

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

Computer chips are made from:

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Iron

Silicon

Helium

Stontium

Aluminium

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)

Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

Field lines are closer to each other in the region where the filed is

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Stronger

Weaker

Much weaker

Absent

None of these

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

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

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0.2 volt

0.8 volt

0 volt

2.0 volt

5.0 volt

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

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

The values 1 and 0 are designated as:

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Continuous values

Binary values

Boolean values

Decimal values

Either (B) 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

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

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Reftification

Amplification

Electric induction

Magnetic induction

None of these

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

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Two

Three

Five

Seven

Eight

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

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Yellow boxes

Black boxes

Red boxes

White boxes

Orange boxes

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