Question # 1

Which material has the greatest di electric constant.

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Mylar

Glass

Germanium

Water

A p-type material is formed then a semiconductor is doped with

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Trivalent impurity

Tetravalent impurity

All of above

A material having excess of free electrons

The coulomb's law is valid for the charges which are.

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Moving and point charges

Moving and non point charges

Stationary and point charges

Stationary and large size charges

The resistance of a wire does not depend upon.

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Area of cross section of the wire

Length of the wire

Temperature of the wire

Current passing though the wire

The dot product of electric intensity and area of a surface is equal to.

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Magnetic flux

Electric flux

Motional emf

Induced emf

Which of the following can be used to calculate electrical power.

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Current x resistance

Potential difference x current

Potential difference / current

Potential difference /resistance

Magnetic moment is a

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Scalar

Vector

Phasor

Tensor

A charge kept at the centre of a shell The shell has charge Q and radius R The force on the central charge due to shell is

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in the upward direction

Towards left

Towards right

Zero

The resistance offered by one cubic meter of a substance is known as.

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Reactance

Conductance

Conductivity

Resistivity

Since selenium becomes conductor in light so it is.

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Photoconductor

Photocell

Thermistor

Photodiode

What is the voltage a 6 Mega resistor when 3 A of current passes through it.

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2 V

9 V

18 V

36 V

In alternating current circuits the quantity which plays the same role as resistance in direct current circuits is called.

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Reactance

Admittance

Conductance

Impedance

The sensitiveness of a moving soil galvanometer can be increased by

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Decreasing the number of turns of the coil

Decreasing the area of the coil

Increasing the couple per unit twist of the suspension

Increasing the magnetic flux

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

A resistance is a device which

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Acids the flow of current is a circuit

Converts electrical energy to heat

Is a type of charge pump

Is like a switch

Which of the following is not a ferromagnetic materials.

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Iron

steel

Copper

Cobalt

Such an inductor coil which does not consume energy and is often employed for controlling A.C. without consumption of energy is called.

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Reactance

Choke

Impendence

Diode

An ideal voltage source has zero.

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Current

Electromotive force

Voltage

Internal resistance

The distribution of electrical charge i an object caused by teh influence of nearby charges is called.

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Electric potential

Electrostatic induction

Electric flux

Electric dipole moment

The SI unit of magnetic flux is

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gauss

Maxwell

Oersted

Water

Which of the given factors is increased in a step down transformer.

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Voltage

Current

Wattage

Resistance

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