Question # 1

When an unbalanced external force acts on a body for a short interval of time.

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The body will experience an impulse.

The momentum of the body increases

The velocity of the body increase

The body is not effected

In the experiment of production od x rays electrons are accelerated towards the anode by

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Thermionic emission

Potential difference

Breaking potential

Cut of currrent

A magnetic pole

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Is made of a magnetic material

Is a factious quantity

Is defined in terms of Ampere's law

Cannot be detected

The rate of change of angular momentum of a body is equal to.

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Applied force

Moment of inertial

Applied torque

Impulsive force

Which law states that an induced current is always in such a direction as to oppose the motion or change causing it.

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Ampere's law

Gauss's law

Lenz's law

Kirchoff's law

Velocity of sound in air at a given temperature

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Increases with increase in pressure

Is independent of the pressure

Decreases with increases in density

Increases with increase in density

The current passing through the coil of a galvanometer is directly proportional to

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Resistance

voltage

Angle of deflection

conductance

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

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Zero

Unity

Double

4 times

During solid ficain the temperature.

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Remains constant at the freezing point

Increases at the freezing point

Decreases at the freezing point

Decreases at the melting point

Why are charged capacitors dangerous.

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They can leak a harmful chemicals

They can cause loss of vision

They can release a lethal charge

They can release gama rays.

Which magnetic properties is inherent in all materials.

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Para magnetism

diamagnetism

Ferromagnetism

demagnetism

Artificial radioactivity was discovered by

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Rontgen

Becquered

Rutherford

Marie Curie and Pierre Curie

The phase velocity is the velocity of a point that moves with a wave at constant phase it is also called.

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Phase speed

Wave speed

Wave velocity

All of these

Which quantity is not affected by a magnetic field.

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Moving charge

Stationary charge

Current flowing in a conductor

Charge in magnetic flux

Monochromatic light passing through a thick prism is.

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Polarize

Disperesed

Diffracted

Deviated

The Rutherford atom according to classical theory is

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Stable

Unstable

Partially stable

Quantized

The force exerted by two charged bodies on another obeys Coulomb's law provided that

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Both bodies are in the same medium

the charges are not too great

On body does not lie inside the other

The linear dimensions of the body are very much less than the distance between the bodies.

When all the systems taking part in a process are included, the entropy.

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Decreases

Either remains constant of increases

Either remains constant or decreases

Remains constnat

A terrestrial telescope produces

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An react and real image

An inverted and real image

An inverted and virtual image

An erect and virtual image

An object travels at constant speed around a circle of radius 1.0 m in 1.0 s the magnitude of its acceleration is.

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zero

1.0 m s-2

2 m s-2

4 pi2 m s-2

Binding energy per nucleon is.

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Greatest for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium weight nuclei

If a liquid does not wet a solid surface, the angle of contact is.

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Less than 90^o

Greeter than 180 ^o

90 ^o

Between 90 ^o and 180^o

A pencil dipped partially into water appears bent because of.

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Reflection of water surface

Diffraction of water surface

Refraction of water surface

Water is a fluid

The dimensions of torque are.

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[MLT-2]

[ML-1T-1]

[ML2T-2]

[ML-2]

Choose the one which acts as single inverter.

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Common emitter

common collector

Common base

Diode

At the temperature of -273 ^oC. pressure of a gas at constant volume becomes zero This specific temperature is called.

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Freezing point

Critical temperature

Absolute zero

Terminal point

Which material has the greatest di electric constant.

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Mylar

Glass

Germanium

Water

Which one of the following is diamagnetic

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Liquid oxygen

Air

Water

Copper sulphate

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

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

Interference fringe spacing depends on

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The wavelength of light used

The distance screen from the coherent sources

Separation between the sources

All of the above

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