Question # 1

A wire of 5 m length carries a steady current if the field inside it is 0.2 v m-1 then the potential difference will be.

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0.1 V

0.5 V

1 V

5 V

Which device converts alternating current to direct current.

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Motor

Generator

Transformer

Rectifier

The resistance of 10 micro F capacitance, when connected to A D.C. circuit is.

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Zero

Unity

-1

Infinity

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

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

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Alpha particles

Electrons

Protons

X rays

The instantaneous voltage across a pure inductance.

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Leads the current by 90 ^o in phase

Lags the current by 90 ^o in phase

Is in phase with the current

Leads the current by a phase angle which depends on the frequency

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

In open circuit electromotive force equal to

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Current

Resistance

Voltage

Inductence

A heater which is to be used on a 250 V mains circuit, has a 5 A fuse in its plug Which of the following is the most powerful heater that can be used with this fuse.

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150 W

500 W

1,000 W

2,000 W

How power factor of a circuit can be improved.

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Using capacitors

Using cokes

Using resistors

All of these

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

Five joules of work is needed to shift 10 C of charge from one place to another The potential difference between the places is.

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0.5 V

2 V

5 V

10 V

The building up of electric charge on the surface of objects is termed as.

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Static electricity

Electric charge

Electric current

Electrostatic induction

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

Which of the following is not a ferromagnetic materials.

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Iron

steel

Copper

Cobalt

Transformer make possible the

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transmission of A.C. power

conversion of AC and D.C

Cyclotron

Particle accelerator

A positive and a Negative charge are initially 4 cm apart When they are moved closer together so that they are now only 1 cm part the force between them is.

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4 times smaller than befor

4 times larger than before

8 times larger than before

16 times larger than before

Which physical law expresses the relationship between the heat generated and the current through a conductor.

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Ohm's law

Kirchoff's law

Joule's law

Ampere's law

What does the electricity meter record.

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Charge

Current

Energy

Power

In a simple D.C. motor the direction of current in the motor is reversed every half revolution to keep the motor turning in the same direction which part of the motor does this.

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Brushes

Coil

Commutator

Poles

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