Question # 1

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

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 electric field intensity of a point charge varies.

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Directly as the square of the distance from the charge

Directly as the square of the charge

Inversely as teh distance from the charge.

Inversely as the square of the distance from the charge

Which factor remains constant in a transformer.

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Current

Voltage

Power

Frequency

The process due to which current flows only during alternate half cycle is known as.

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Filtration

saturation

Half wave rectification

Full wave rectification

If the source of emf is traversed from negative to positive terminal the potential charge.

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Is negative

Is positive

Is zero

Remain the same

Pure silicon has valence electrons

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1

2

3

4

When a following field is governed by Maxwell's equations.

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Electrodynamics

Optics

electric circuits

All of these

A pure capacitor is connected in an AC circuit The power factor of the circuit will be.

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Unity

Infinity

0.5

Zero

The material of an electromagnet should have high

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Permeability

susceptibility

Retentivity

Hysteresis loss

Which of the following parameters is irrelevant for a fuse wire.

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Its radius

Current flowing through it.

Its specific resistance

Its length

The picture to be transmitted must be scanned because in T.V transmission light wave are first changing into.

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sound wave

Electric fluctuations

Magnetic fluctuations

Signals

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.

Why should the metal casing of an electrical fire be earthen.

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To complete an electrical circuit.

To prevent the fire from overheating

To reduce the risk of electric shocks

To stope the casing from getting too not to touch

On which principle the induction coil works on.

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Self induction

Ampere's rule

Mutual induction

Gauss's law

In which process the passage of an electric current through a conductor releases heat.

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Joule heating

Ohmic heating

resistive heating

All of these

In a galvanometer the enameled copper wire is wound on.

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An insulator

A non magnetic material

A magnetic material

A conductor

The phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristics temperature is called.

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Resistivity

Conductivity

Super conductivity

Volume resistivity

The current passing through the switch s will be

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Zero

3 A

4.5 A

10 A

Electricity is transmitted at high voltage rather than at low voltage because.

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It is generated at high voltage

It is safer

It requires less insulation

It wastes less energy

The ratio of average induced emf to the rate of changing of current in the coil is called.

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Self induction

Mutual induction

Self inductance

Mutual inductance

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