Question # 1

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

In describing function of digital systems, 1 represents:

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Closed switch

True Statement

Lighted bulb

Only (B) and (C)

All are true

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

The SI unit of charge is

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Ampere

Watt

Coulomb

Volt

Joule

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 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)

A potential barrier of 0.7 V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

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

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

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

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

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

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

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)

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.

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