Question # 1

In a transistor, collector current is controlled by

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Collector voltage

Base current

Collector resistance

All of the above

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

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 make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

The values 1 and 0 are designated as:

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Continuous values

Binary values

Boolean values

Decimal values

Either (B) and (C)

Whenever a covalent bond breaks, it creates:

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An electron

A hole

An electron-hole pair

A positron

All of these

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

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

The concept of electric field theory was introduced by

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Michael Faraday

Newton

Dalton

Kepler

Einstein

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

In the forward biases situation, the current flowing across the p-n junction is a few:

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amperes

Milli amperes

Micro amperes

Pico amperes

None of these

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

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

Inverter is the name given to:

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NOT gate

OR gate

NOR gate

AND gate

XOR gate

Computer chips are made from:

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Iron

Silicon

Helium

Stontium

Aluminium

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

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Physics ECAT Pre Engineering Chapter 18 Electronics Physics Online Test MCQs With Answers

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