Question # 1

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

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

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

The most common trivalent impurities are

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Boron , indium

Arsenic, indium

Arsenic, Antimony

Aluminium, Boron

Slip Rings are used in

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D.C. dynamo

A.C. dynamo

Transformers

Battries

The separation between the plates of a parallel plate capacitor with original capacitance C is doubled its present capacitance will be.

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1/4 C

1/2 C

2C

4 C

Electromotive force is closely related to.

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Inductance

Magnetic flux density

Potential difference

Electric field intensity

The cause of ferromagnetism is.

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Orbital motion of elections

spin Motion of electrons

Permanent dipole memento

Spin angular momentum

When a point charge which is responsible for a force being exerted on another point charge is suddenly moved the second charge experience.

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Nor charge of force

An instantaneous change of force

A sudden change of force of some later time

an increase of its charge because of induction.

The combined resistance of two identical resistors, connected in series is 18 Mega Their combined resistance in a parallel arrangement will be.

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2 Mega

4 Mega

8 Mega

12 Mega

When a balloon sticks to the whiteboard It is an example of.

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Conoduction

Induction

Polarization

Conservation of charge

What information is given by the tangent to a field that point of electric field.

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Magnitude

Direction

Proper unit

Dimensions

Which factor remains constant in a transformer.

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Current

Voltage

Power

Frequency

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

A magnetic field is said to exist at a point if

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A force is exerted on a charge placed at that point

A magnetic pole exists at that point

An ampersand current loop surrounds the point

A force not felt by a static charge acts on a moving charge placed at that point

The capacity of a spherical conductor is numerically equal to its.

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Surface area

Diameter

Radius

Volume

The electric heater takes a current of 4 A from a 250 V supply . How long would it take the heater to convert 400,000 J of electric energy.

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100 s

200 s

400 s

750 s

When a current of 2 A flows for 5 s through a lamp 120 W of power are used How much charge flows through the lamp.

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10 C

12 C

24 C

60 C

Susceptance of a circuit is the reciprocal of.

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Admittance

Resistance

Reactance

Impedance

The SI unit of mutual induction a

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Vs-1 A-1

V m -1 A-1

Henry

Tesla

In a R-L-C series circuit, when the frequency of A.C. source is high the circuit is.

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R-L Circuit

R-C circuit

L-C circuit

R-L or R-C

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