Question # 1

What is the effect on the product of resistivity and conductivity if the temperature of a conductor is increased.

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It decreases

It increases

It remains the same

It may increase or decrease

Lagging of magnetic flux density behind the magnetizing fled is known as.

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susceptibity

Diamagnetism

Hysteresis

Retentivity

Inductance divided by resistance and the product of capacitance and resistance both have units of.

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Charge

Time

Force

Current

The resistance of a capacitor when it is connected with a battery is.

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Zero

Finite

Infinite

The same

Which of the following remains unaffected in a magnetic field.

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a particles

b partciles

gama particles

Electrons

A number of spherical capacitors of different radii have same potentials The surface charge density on them

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I equal

Is proportional to their radii

Is inversely proportional to their radii

Is inversely proportional to square of their radii

House hold circuits are mostly

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Wired in sires

Wired in parallel

Made using wires of gold

Made using wires of silver

A diode cn be used as

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Amplifier

Rectifier

Oscillator

Transistor

One Tesla is equal to.

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1 N A-1

1 N m-1

1 N A -1 m

1 N A -1 m-1

The electric heater takes a current of 4 A from a 250 V supply . How long would it take the heater to convert 400,000 J of electric energy.

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100 s

200 s

400 s

750 s

Which of the following is the ability to hold an electric charge in electromagnetism.

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Resistance

Impedance

Inductance

Capacitance

What information is given by the tangent to a field that point of electric field.

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Magnitude

Direction

Proper unit

Dimensions

Coulomb's law for the electrostatic force between two electric charges resembles the

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Law of conservation of energy

Law of conservation of mass

Newton's law of gravitation

Newton's law of motion

Iron loss in a dynamo arises because of.

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The resistance of armature coil

The production of eddy current

The presence of mechanical friction

The leakage of flux

For an A.C. circuit the power factor is

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Always les than one

Always greater than one

Always equal to one

Absent

An ideal voltage source has zero.

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Current

Electromotive force

Voltage

Internal resistance

The rectangular coil in galvanometer is made up of.

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Bare copper wire

Insulated aluminum wire

Enameled copper wire

Enameled steel wire

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

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Thoriated tungsten

Tungsten

Copper

Cesium

The current passing through the switch s will be

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Zero

3 A

4.5 A

10 A

The magnetic field inside a solenoid is

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Zero

Infinite

Uniform

Non uniform

When a current of 2 A flows for 5 s through a lamp 120 W of power are used How much charge flows through the lamp.

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10 C

12 C

24 C

60 C

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