Question # 1

Which of the following is an electrical insulator that can be polarized by an applied electric field.

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Conductor

Condenser

Di electric

Capacitor

A voltmeter is a

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High resistance galvanometer

Low resistance galvanometer

Zero resistance galvanometer

Infinite resistance galvanometer

A torch bulb uses a 3 V supply and makes a current of 0.2 A It is switched on for one minute How much electrical energy is used.

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0.6 J

12 J

24 J

36 J

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

A gallium atom is.

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Monvalent

Diavalent

Trivalent

Pentavalent

The circuit of full wave rectification consists of

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Only one diode

Two diodes

Three diodes

Four diodes

On which principle the induction coil works on.

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Self induction

Ampere's rule

Mutual induction

Gauss's law

On which factor mutual induction of two coils does not depends upon.

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Number of turns of the coils

Area of cross section of the coils

Closeness of the coils

Shape of the coils

The internal resistance of a primary cell depends upon the.

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Current dawn form the cell

Concentration of the solution

distance between cell electrodes

All of the above

Which is not the strongest and the most familiar type of magnetism.

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Diamagnetism

Para magnetism

Ferromagnetism

All of these

A preset or trimmer can be a.

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Variable resistor

Variable capacitor

Variable inductor

All of these

Which one fo the following is based on the diffraction and repulsion of electric charge.

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Capacitor motor

Transformer

Induction motor

synchronous motor

The net charge on a condenser is

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Zero

Q/2

2Q

Infinity

The impedance of the circuit at resonance frequency is

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Minimum

Maximum

Zero

Infinity

The permeability of air is

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0.5

zero

infinity

Unity

What is the properly of materials that responds at an atomic or subatomic level to an applied magnetic field.

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Magnetism

electroplating

Diamagnetism

Electrolysis

The SI unit of magnetic flux is.

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N A-1

N m-1 A

N m A-1

N m-1 A-1

An electrical device is rated at 12 W , 2 A How many 1.5 V batteries are needed in the device.

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2

4

6

8

Which material has the greatest di electric constant.

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Mylar

Glass

Germanium

Water

One volt is equal to.

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One joule per coulomb

One dyne per coulomb

One newton per coulomb

One watt second

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

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