Question # 1

In any L-C-R circuit

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Current lags the applied voltage

Current leads the applied voltage

Current sometimes leads and sometimes lags the applied voltage

Current remains in phase with voltage

A junction between P-Type and n-type materials is called.

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Ampilifier

Transistor

Rectifier

Diode

A substance which has empty conduction band.

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Insulator

Conductor

Semi conductor

super conductor

The force on a point charge due to electromagnetic fields is called.

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Lorenz force

Gauss's force

Newton's force

Ampere's force

What units are used to rate electrical fuses.

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Volts

Ampere

Watts

Hertz

What for is semiconductor diode used.

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To convert D.C. to A.C.

To convert A.C. to D.C.

To increase voltage

To decrease voltage

Which device converts alternating current to direct current.

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Motor

Generator

Transformer

Rectifier

Which one of the following describes a measure of opposition to alternating current.

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Electrical impedance

Capacitance

Inductance

Admittance

Which given material is the best for making connecting wires

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Nichrome

Iron

Gold

Copper

Pure silicon has valence electrons

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1

2

3

4

Which of the following is an electrostatic generator.

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Winshurst machines

Van de Graff generator

Electrophorus

All of the above

The force exerted by two charged bodies on another obeys Coulomb's law provided that

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Both bodies are in the same medium

the charges are not too great

On body does not lie inside the other

The linear dimensions of the body are very much less than the distance between the bodies.

Which one of the following is diamagnetic

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Air

Water

Copper sulphate

Liquid oxygen

An Electric kettle should always be fitted with an earth connection as a protective device What is being protected by the earth connection.

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The cable connecting the kettle

The fuse in the circuit

The heating element of the kettle

The person using the kettle

How power factor of a circuit can be improved.

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Using capacitors

Using cokes

Using resistors

All of these

The process of converting A.C and D.C. is known as

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Amplification

_Filtration

Rectification

Saturation

Static electricity occurs when

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two metals are connected to a battery

Different insulators are rubbed together

The weather is very humid

Different conductors are rubbed together

For an A.C. circuit the power factor is

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Always les than one

Always greater than one

Always equal to one

Absent

According to Gauss's law the number of electric field lines crossing any closed surface is.

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numerically equal to the enclosed charge

Equal to the enclosed positive charge

Equal to teh electric field inside the surface

Equal to the charge density on the surface.

Susceptance of a circuit is the reciprocal of.

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Admittance

Resistance

Reactance

Impedance

When a pentavalent material like arsenic is added to a tetravalent material such as germanium, we get a.

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n-type material

p -type material

diode

super conductor

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