Question # 1

The two elements with same number of electrons but different mass number are called.

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Isotones

Isobars

Isotopes

Isomers

The energy following per second through a unit area held perpendicular to the direction of wave is.

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The loudness of the sound waves

The pitch of the sound waves

The intensity level of sound waves

The intensity of sound waves

A unijunction transistor

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Has only one junction

Is a two terminal device

Is fabricated from germanium

Is fabricated fromuranium

Which of the following is formed by decay of a free neurton.

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A number of electrons

Two protons

A proton and an electron

An alpha particle

Triple point of water in Kelvin scale is

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0 K

100 K

273 .15 K

373.15 K

Which quantity is common for systems in thermal equilibrium.

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Heat

Temperature

Momentum

Specific heat

An active component of an electronic circuit consisting of a small block of semiconducting material to which at least three electrical contacts are made is known as.

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Rectifier

Amplifier

Thermocouple

Transistor

In CE amplifier phased reversal occurs when the output voltage is taken between

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Base and collector

Base and emitter

Collector and emitter

None of the terminals

Why does a transformer have a core made of iron.

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Iron has a high melting point

Iron is a magnetic material

Iron potential and high current

Iron is a conductor of electricity

If T1 and T2 are source and sink temperature respectively Carnot efficiency is.

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T1+T2/T1

T1-T2/T1

T1+T2/T2

T1-T2/T2

Which magnetic properties is inherent in all materials.

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Para magnetism

diamagnetism

Ferromagnetism

demagnetism

When a magnet is moved into the coil of wire there is a small reading on the galvanometer Which change would increase the size of the reading.

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Pushing in the S-pole

Pulling the magnet out

Unwinding some of the turns of wire

Moving the magnet faster

If velocity is doubled then

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Momentum increase 4 time and K.E. increase 2 times

Momentum increases 2 times and K.E. remains constant

Momentum increases 2 times and K.E. increases 4 times

Both momentum and K.E. remain constant

Super conductor are used in

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Fast computer chips

Magnetic resonance imaging

Magnetic levitation trains

All of the above

In a compound microscope objective lens acts as a projector and eye place as a

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Compensator

Erecting lens

Simple microscope lens

Turntable

If the earth stopped rotating the weight of objects at either pole would.

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Be grater

Be less

Vary with altitude

Be the same before

A heart coil is out into two equal parts and only one part is now used in the heater The heat generated will be.

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Halved

One fourth

Doubled

4 times

The value of principal quantum number for an ionized atom is.

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13.6 eV

27.2 eV

54.4 eV

100 eV

Which of the following causes the deflection of Alpha particles when they re passed through a thin foil.

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Attraction of nucleus

Collision with nuclei

Interactions with electrons

Electrostatic repulsion by the nucleus

The dimension of momentum is.

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[MLT-1]

[ML2T-2]

[ML3T-2]

[MLT-1]

A hydrometer floats to a particular level in sea water in fresh water it.

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Floats lower

Sinks completely

Floats higher

Floats at the same level

Which kind of motion is exhibited by molecules of monoatomic gas.

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Rotatory

Vibratory

Translatory

Random

the amplitude of a wave indicates

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Wavelength

Frequency

Intensity of wave

Nature of wave

The value of magnetic field strength for parament magnets is.

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Unity

Infinity

Zero

Two

The cloud chamber was invented by C.T.R. Wilson in

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1905

1907

1909

1911

Which one of the following gases posses maximum oot mean square velocity.

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Hydrogen

Oxygen

Nitrogen

Carbon dioxide

When two point charges of equal magnitude and opposite sign exist very close to one another the arrangement is called.

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An electric dipole

An amperian current

A null charge

A neutral source

The pressure necessary to liquify a gas at the critical temperature is called.

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Normal pressure

Atmospheric pressure

Critical pressure

Liquid pressure

The convincing evidence of the wave nature of electrons was provide by.

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Stefan

Rayleigh

Davision and Germer

Balmer

A current carrying loop lying-in a magnetic field behaves lime a.

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Magnetics pole

Magnetic material

Magnetic dipole

Horse shoe magnet

Which of the following phenomenon gives evidence of the molecular structure of mater

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Evaporation

Diffusion

Brownian movement

All of the above

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