Question # 1

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 make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) 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

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

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One

Two

Three

Four

None 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

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

The electric field lines start from

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Positive charge

Negative charge

Either A or B

Neutron

An atom

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

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

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

In a transistor, collector current is controlled by

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Collector voltage

Base current

Collector resistance

All of the above

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

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

The number of LED'S needed to display all the digits is:

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Four

Five

Nine

Six

Seven

Computer chips are made from:

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Iron

Silicon

Helium

Stontium

Aluminium

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