Question # 1

A p-type material is formed then a semiconductor is doped with

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Trivalent impurity

Tetravalent impurity

All of above

A material having excess of free electrons

A transformer is needed to convert a mains 240 V supply into a 12 V supply it there are 200 turns on the primary coil, how many turns should there be on the secondary coil.

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100

200

400

600

In L - C parallel circuit the coil draws a.

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Lagging current

Leading current

Lagging voltage

Leading voltage

In a parallel resonant circuit, at resonance

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Current is maximum

Voltage is maximum

Impedance is minimum

Impedance is zero

The field inside a hollow spherical conductor is.

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Constantin zero

Constant but not necessarily zero

A function of charge on sphere

a function of distance from the centre

When a positive charge is allowed to move from positive to negative plate, then it will gain

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P.E.

K.E

Gravitational energy

Electrical P.E.

An electric motor could be used as a

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Battery

Capacitor

Dynamic

Transofrmer

Current in an electrolyte is carried by.

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Electron only

Anions only

Citations only

Mesons only

Faraday's law deals with

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Induced emf

Motional emf

Induced current

Electric current

It is deduced that a piece of metal is already a magnet if

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A copper wire is attracted to it

A copper wire is repelled by it

One end of a compass is repelled by it

Both ends of a compass needle are attracted to it.

Charge to mass ration of an electron is determined by using the relation.

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e/m = B/rv

e/m = r/vB

e/m = V/Br

e/m = v/r

What units are used to rate electrical fuses.

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Volts

Ampere

Watts

Hertz

An uncharged di electric body experience a force when placed in an electric field if.

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A field in non zero at the body

The electric is a polar material

The dielectric is a non polar material

The field is non uniform over the body

Para magnetism is.

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A distrotion effect

An orientation effect

A skin effect

A resistance

Inductance divided by resistance and the product of capacitance and resistance both have units of.

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Charge

Time

Force

Current

If we use two diodes and a centre tapped transformer we will get.

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A transistor

An amplifier

A half wave rectifier

A full wave rectifier

Charge carriers in thermocouples are.

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Anions

Cations

Electrons

Protons

An electrical source with internal resistance's' is said to operate a lamp of resistance R what fractions of the total power is delivered to the lamp.

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R+r/R

R-r/R

R/R+r

r/R-r

The impedance of the circuit at resonance frequency is

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Minimum

Maximum

Zero

Infinity

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

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Ampilifier

Transistor

Rectifier

Diode

The steady current which produces the same heating effect in a resistance in a given time as the alternating current does in the same resistance in the same time is called.

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Induced current

Root mean square value of an alternating current

Mean value of alternating current

Electromotive force

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