Question # 1

Electrostatic force as compared to gravitational force is

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Zero

infinite

Very weak

Very strong

Transformer make possible the

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transmission of A.C. power

conversion of AC and D.C

Cyclotron

Particle accelerator

The work done is moving a very small charge in an electric field from one point to another is

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Independent of the path

Equal to the potential difference between the two points.

Measured in V m-1

Measured in J c-1

in the region where the field lines are parallel and equally spaced, the field is.

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Zero

Unirorm

Non uniform

Negative

At high frequency the current through a capacitor will be

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Small

Zero

Large

Infinity

A single silicon photovoltaic cell produces a current of the order of.

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A few miliamperes

10² A

10³ A

10⁴ A

Lagging of magnetic flux density behind magnetic field is known as.

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Permeability

Susceptibility

Hysteresis

Uncertainty

The phase angle between the voltage and current is A.C. circuit though a resistor is.

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0 ^o

45 ^o

90 ^o

180 ^o

In rectifiers silicon junction diodes are preferred to germanium type because.

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They are cheaper

They are durable

Their much lower reverse current makes them more efficient

Of their geometry

What units are used to rate electrical fuses.

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Volts

Ampere

Watts

Hertz

Photo diodes are used as

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Optical fibre receivers

Automatic switching

Logic circuits

All of the above

The potential difference between two points is equal to the difference of

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Kinetic energy

potential energy

Electric current

Charge energy

The current passing through the coil of a galvanometer is directly proportional to

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Resistance

voltage

Angle of deflection

conductance

A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed.

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To increase the resistance of the circuit

To make it easier for the current to flow

To protect the wiring form overheating

To reduce the voltage across thelamp

An electric current in conductors is due to the flow of.

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Positive ion

Negative ion

Positive charges

Free electrons

A steel of which material should be placed between the plates of a parallel plate capacitor in order to increase its capacitance.

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tin

Iron

Copper

Mica

How the small bulbs used for decoration purposes are connected.

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In parallel

In series

In mixed order

In vertical position

Mutual inductance has a practical role in the performance of the

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Radiochoke

Transformer

Generator

Trnasistor

The sensitivity of the galvanometer can be increased by increasing the

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Number of turns of the coil

Area of the coil

Strength of the magnetic field

All of the above

If work must be done by an outside agent attempting tobring two point charges close together.

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They are of opposite signs

The field is not conservative

The work is recoverable when they separate

The P.E. of the charges is reduced by the amount of the work done

They hysteresis losses are eliminated in power transformer by using

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Low resistivity power winding

Low reflectance steel cores

Laminated steel cores

soft iron cores

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