Question # 1

Efficiency of a half wave recitifier is.

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Almost negigible

More than full wave rectifier

Less than full wave rectifier

Equal to full wave rectifier

Two pure inductors each of self inductance L are connected in parallel The total inductance of the combination is.

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L

2L

L/2

L/4

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

In a n-type material there is an excess of.

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Free electrons

Holes

Quarks

Measons

Which of the following is an electrostatic generator.

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Winshurst machines

Van de Graff generator

Electrophorus

All of the above

If we make the magnetic field stronger the value of induced emf is.

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Decreased

Increased

Vanished

Kept constant

In the circult, the ammeter reading is 0.5 A . If the resistance of the voltmeter is 180Ohm What is the voltmeter rediang.

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90 V

100 V

180 V

900 V

When forwarded bias is applied to a junction diode it.

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Increases the potential barrier

Decreases the potential barrier

Reduces the majority carrier current to zero

Reduces the minority carrier current to zero

A voltmeter is a

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High resistance galvanometer

Low resistance galvanometer

Zero resistance galvanometer

Infinite resistance galvanometer

Magnetic moment is a

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Scalar

Vector

Phasor

Tensor

Which of the following are sources of direct current.

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Batteries

Solare cells

Thermocouples

All of these

The direction of electric field line surround the test charge -q id

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Parallel

Perpendicular

Radially outward

Radially inward

Which method of charging is involved in making lightning.

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Induction

Friction

Contact

Convection

Which of the following material could be used for a high vacuum, high voltage tube.

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Thoriated tungsten

Tungsten

Copper

Cesium

Generally, electrical resistivity of intrinsic semiconductors decreases with increasing.

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Pressure

Volume

Temperature

Density

If a capacitor is charged by using a 1.5 V battery, how much charge will capacitor gain.

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0 V

0.5 V

1.5 V

3 V

in the region where the field lines are parallel and equally spaced, the field is.

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Zero

Unirorm

Non uniform

Negative

Thermocouple is used for

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Converting atomic energy into heat energy

Measure the radiant energy

Storing the heat energy

Measuring current

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

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Zero

Unity

Double

4 times

An Electric kettle should always be fitted with an earth connection as a protective device What is being protected by the earth connection.

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The cable connecting the kettle

The fuse in the circuit

The heating element of the kettle

The person using the kettle

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

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