Question # 1

Under which of the following conditions current in a circuit is wattles.

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When inductance in the circuit is zero

When resistance in the circuit is zero

When current is alternating

When resistance and inductance both are zero

A semiconductor diode conducts only when it is

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Not biased

Zero biased

Reverse biased

Forward and biased

What is the voltage a 6 Mega resistor when 3 A of current passes through it.

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2 V

9 V

18 V

36 V

A bulb of 100 W is connected to a 160 V supply What will be the power consumed.

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25 W

30 W

50 W

64 W

Amorphous solids are also called

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Crystalline solids

Glassy solide

super conductors

Polymeric solids

In which of the following eddy current is not used

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Induction furnace

Automobile speedometer

Electromagnetic damping

X- rays diffraction

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

What is emitted by the hot metal filament in a cathode ray tube.

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Alpha particles

Electrons

Protons

X rays

A charge less region which separates p-type and n-type semiconductors in a p-n junction is known as.

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Polar region

Null region

Depletion region

Neutral region

The circuit in which current and voltage are in phase the power factor is.

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Zero

Unity

Double

4 times

Magnetic moment is a

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Scalar

Vector

Phasor

Tensor

The value of power factor in an LCR sense circuit at resonance is.

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Zero

0.5

unity

Infinity

The cause of production of eddy current is the

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Current flowing in a conductor

Current flowing in a insulator

Motion of a conductor in a varying magnetic field

Motion of an insulator in a varying magnetic field

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

All the magnetic materials lose their magnetic properties when

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Dipped in oil

Dipped in water

Heated

Cooled

Electrostatic force as compared to gravitational force is

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Zero

infinite

Very weak

Very strong

The emf induced by the motion of a conductor across a magnetic field is called.

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Absolute potential

Motional emf

Induced emf

Terminal potnetial

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

In a series resonant circuit, the current at resonance is.

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Maximum

Minimum

Zero

Sometimes maximum and sometimes minimum

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.

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