Question # 1

How the small bulbs used for decoration purposes are connected.

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In parallel

In series

In mixed order

In vertical position

Resistance and resistivity of a substance

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Increase with rise in temperature

Decrease with rise in temperature

Remains same at every temperature

Increases at high voltage

The ratio of average induced emf to the rate of changing of current in the coil is called.

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Self induction

Mutual induction

Self inductance

Mutual inductance

If emf of the battery in a thermocouple is doubled, what is the rate of heat generation at one function.

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Remains unchanged

Becomes half

Become double

Becomes 4 times

Which material has the larges resistivity.

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Silver

Germinium

Amber

Sulphur

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

The magnetic flux linked with a circuit when a unit current flows through it is known as.

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Induced current

Induced emf

Coefficient of self induction of circuit

Eddy current

In electric magnetism , the additional fundamental quantity that is chosen as a basic unit is called.

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Electric potential

Electric fierce

Electric charge

Magnetic force

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

When a diamagnetic substance is inserted in a current carrying coil the magnetic field is

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Decreased

Increased

unchanged

Increased or decreased, depending upon the relative volume of the substance

What can be used as the unit of envery.

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N m-1

V A

W.s

V C-1

Why a positive charged object is made neutral by someone touching it.

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Electrons flow from the object

Proton flow onto the object

Protons flow from the object

Proton flow onto the object

Mutual inductance has a practical role in the performance of the

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Radiochoke

Transformer

Generator

Trnasistor

The source of magnetic field are

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Isolated magnetic poles

Electric charge distributions

Current loops

Solenoids

A charged particles moving in a magnetic field experiences a resultant force.

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Proportional to its K.E.

In the direction of the field

In the direction opposite to its motion

In the direction perpendicular to both the field and its motion

On which of the following parameters the amount of charge that can be placed on a conductor does not depend on.

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Its capacitance

Its size or shape

its potential

Dielectric strength of the surrounding medium

Wattles current is said to flow when phase angle between virtual current and virtual voltage is

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0^o

90 ^o

180 ^o

270^o

Which are the following describe the study of static magnetic fields.

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Electrodynamics

Megnetostatic

Electrostatic

Paraamagnetism

For which material magnetic susceptibility is negative.

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Paramagnetic

Diamagnetic

Ferromagnetic

All of these

What happens when a 250 V, 2500 W water heater is connected to main supply using a plug fitted with a 5 A fuse.

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The fuse in the plug melts

The heartier burns out

The hearter runs at half power

The hearter works normally

Transformer make possible the

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transmission of A.C. power

conversion of AC and D.C

Cyclotron

Particle accelerator

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