Question # 1

The ration of intensity of magnetization to the magnetic force is known as.

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Parmeability

Magnetic induction

Magnetic intensity

Magnetic susceptibility

The direction of force on a moving negative charge will be.

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Opposite to that of positive charge

Similar to that of positive charge

At right angel to the positive charge

Parallel to the positive charge

A dry battery can deliver 3,000 J energy to a small 2 W electric motor before the battery is exhausted for how minutes does the motor run.

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20 minutes

25 minutes

75 minutes

125 minutes

Self inductances of solenoid is

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Directly proportional to the current flowing through the wire

Directly proportional to its length

Inversely proportional to area of corss section

Directly proportional to number of turns

A device consisting two different conductors that produce a voltage proportional to the temperature difference between either end of the pair of conductors is a.

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Thermistor

Thermocouple

Strain gauge

Potentiometer

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

If a conductor sun infirmly stretched so that its length is increased in timed, then its resistance becomes.

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n times the original resistance

1/n times the original resistance

n2 times the original resistance

n3 times the original resistance

When the number of turns in the solenoid is doubled without any change in teh length of the solenoid its self inductance will be.

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Halved

Doubled

4 times

8 times

The SI unit of mutual induction a

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Vs-1 A-1

V m -1 A-1

Henry

Tesla

What is the properly of materials that responds at an atomic or subatomic level to an applied magnetic field.

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Magnetism

electroplating

Diamagnetism

Electrolysis

The value of mutual inductance can be increased by

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Decreasing number of turns in the coil

Increasing number of turns in the coil

Winding the coil on china clay

Winding the coil on wooden frame

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

When the frequency of A.C in L - C- R circuit is incrased the impedance of L-C-R circuit.

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Increase

Decrease

Remain unchanged

First decrease and then increases

Alternating current generator consists of a coil and a pair of.

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Split rings

Slip rings

Metal rings

Copper rings

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

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Voltage

Current

Wattage

Resistance

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

Photo diodes are used as

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Optical fibre receivers

Automatic switching

Logic circuits

All of the above

A wire surrounded by a concentric cylindrical metal shield constitutes a.

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Spherical capacitor

Parallel plate capacitor

Cylindrical capacitor

Cylindrical condenser

A straight copper wire a moved in a uniform magnetic field such that it cuts the magnetic lines of force then.

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emf will not be induced

emf will beinduced

sometimes emf will be induced and sometimes not

The number of turns iin the coil increases

The minimum value of charge on any object is.

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1.6 x 10^-29 C

1.6 x 10^-19 C

1.6 x 10^-9 C

1 C

Which of the following is most suitable for the core of the electromagnetism

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Air

Steel

Su Ni allow

Soft iron

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