Question # 1

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

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

Whenever a covalent bond breaks, it creates:

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An electron

A hole

An electron-hole pair

A positron

All of these

Electric intensity at a place due to a charged conductor is a

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Scalar quantity

Vector quantity

Semi vector and semi scalar

Dimensionless quantity

Both A and D are true

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

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)

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

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

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 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

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

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Two

Three

Five

Seven

Eight

Electric field strength is defined as

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Work done on unit charge

Force exerted on unit charge

Distance covered by unit charge

Power exerted by unit charge

None of these

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

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

Majority charge carriers in the p-region of p-n junction are:

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electrons

positrons

Holes

Neutrons

None of these

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