Question # 1

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

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)

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)

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

Electric lines of force

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Intersect each other

Are always parallel

Are always anti-parallel

Never intersect

None 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 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

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

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electrons

positrons

Holes

Neutrons

None of these

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

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)

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

Inverter is the name given to:

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NOT gate

OR gate

NOR gate

AND gate

XOR gate

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)

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

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

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

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