Question # 1

Op-amp has been discussed as comparator of:

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Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

A hole in p-type my be due to:

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Trivalent impurity

Breking of some covalent bond

Pentavalent impurity

Germanium

Either (A) or (B)

In AND gate, the output is 1 if:

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Both inputs are 0

Both inputs are 1

Only one input is 0

Both (A) and (B)

Both (A) and (C)

Improper biasing of a transistor circuit produces

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Heavy loading of emitter current

Distortion in the output signal

Excessive heat at collector terminal

Faulty location of load line

Most of the electrons in the base of an NPN transistor flow

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Out of the base lead

Into the collector

Into the emit

Into the base supply

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

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

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

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

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Reftification

Amplification

Electric induction

Magnetic induction

None of these

The number of input terminals of an op-amp is:

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One

Two

Three

Four

None of these

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

Electric field lines emerge from the charges in

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One dimension

Two dimensions

Three dimensions

Four dimensions

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

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)

Silicon is one of the mot commonly used:

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onductor

Dielectric

Insulator

Semiconduction

Both (B) and (C)

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

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Two

Three

Five

Seven

Eight

Computer chips are made from:

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Iron

Silicon

Helium

Stontium

Aluminium

Michael Faraday is known by his work on

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Nuclear strong force

Gravitational force

Nuclear weak force

Electric force

None of these

The values 1 and 0 are designated as:

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Continuous values

Binary values

Boolean values

Decimal values

Either (B) and (C)

.Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

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

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

Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

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

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

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

Whenever a covalent bond breaks, it creates:

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An electron

A hole

An electron-hole pair

A positron

All of these

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