Question # 1

A ball mass 0.25 kg is thrown to a height of 20 m The change in G.P.E is

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49 J

50 J

-75 J

500 J

The material of an electromagnet should have high

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Permeability

susceptibility

Retentivity

Hysteresis loss

If the number of gas molecules in a cubical vessel is increase from N to 3 N then its pressure and total energy will be.

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Half

Three times

Double

Four times

The extension produced in a sample of material depends upon

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Nature of the material

Stretching force

Cross range order

All of the above

Which electrical quantity has the same units as electromotive force.

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Charge

Current

Potential difference

Power

A wire stretches 8 mm under a load of 60 N A second wire of the same material with half the diameter and a quarter of the original length of the first wire, is stretched by the same load What is the extension of the wire.

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1 mm

4 mm

8 mm

16 mm

The absorption of X-rays in a given material follows.

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A parabola path

Is straight line

An exponential curve

A circle

Which of the following can be used as an arrester in a nuclear reactor.

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Graphite

heavy water

Uranium

Cadmium

The expression PV/KT represents.

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Number of moles of the gas

Number of molecules in the gas

Total mass of the gas

Density of the gas

A boat loving at constant speed 'v' through still water experiences a total frictional drag F what is the power developed by the boat.

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1/2 Fv

Fv

1/2 Fv2

Fv2

When an object moves with a very high speed the length in the direction of motion.

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Contracts

Expands

Remains the same

Becomes infinity

The specific heat capacity of the body depends upon.

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the heat given to it

Mass of the body

Temperature raised

Material of the body

Powder clings to the face due to

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Compression

Capillary action

Cohesion

Adhesion

What is the value of earth's magnetics fields.

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5 G

50 G

100 G

500 G

The velocity of light was determined accurately by

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Newton

Huygen

Michelson

Young

Laser light is considered to be coherent because it consists of.

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Many wavelengths

Uncoordinated wavelengths

Coordinated waves of exactly the same wavelength

Divergent beams

When a helium atom loses an electron it becomes.

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An a particle

A proton

A positive helium ion

A negative helium ion

When ever current is drawn from a cell Its terminal potential difference and emf become

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Different

Same

Zero

Negative

What is the power factors of wattles current.

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Infinity

Unity

0.5

Zero

A tin film of liquid is enclosed between two glass plates it is difficult to spates the plates on account of.

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Surface tension

Atmospheric pressure

Viscosity

Friction

In the fusion process, there are

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Hydrogen isotopes

Helium Isotopes

Carbon isotopes

Oxygen isotopes

A junction between P-Type and n-type materials is called.

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Ampilifier

Transistor

Rectifier

Diode

Under an isothermal process internal energy of the system.

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Increases

Decreases

Remain constant

is Zero

Echoes arise from

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Reflection

Refraction

Diffraction

Dispersion of sound waves

The continuous X rays spectrum is due to an effect.

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Bremsstrahlung

Breaking radiation

Holography

both a and b

When transvers wave travelling in a less dense medium is reflected at an interface will a more dense medium.

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A trough becomes a crest

There is no phase shift

There is phase shift of 360 ^o

A crest remains a crest

Induced fission result from the absorption of

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electron

Proton

Nucleon

Neutron

Which of the following pair of physical quantities have the same dimension.

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Momentum and pressure

Energy and work

Linear and angular momentum

Force and surface tenstion

In which device is a permanent magnet used

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An electric bell

An electromagnet

A plotting compass

A relay

Special theory of relativity deals with the events in the frames of reference which move with constant.

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Time interval

Acceleration

Momentum

space interval

At high frequency the current through a capacitor will be

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Small

Zero

Large

Infinity

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