Question # 1

Bohr's atomic model assumes

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Nucleus is of infinite mass and is at rest

electron in a quantized orbit will not radiate energy

Mass of electron remains the same

All of the above

The circumference of earth was measured by

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Alberuni

Alkundi

Ibn al haithem

Issac Newton

the amplitude of a wave indicates

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Wavelength

Frequency

Intensity of wave

Nature of wave

Conductance is the reciprocal of

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Inductance

Capacitance

Resistance

Admittance

The dimensions of stress are

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[MLT-1]

[ML-1 T]

[ML-1T-1]

[ML-1T-2]

Who discovered a phenomenon of thermos electricity.

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Peltier

Joule

Seeback

thomson

Woolen clothing a effective in keeping us warm because.

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An trapped int he wool acts as an insulator

Heat loss by convection and radiation is prevented

Wool is bad traciator and good absorber of heat

Wool can retain high temperatures

92.65 is round off as

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92.6

93.00

92.7

None of these

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

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Air

Steel

Su Ni allow

Soft iron

A component of the spectrometer which consists of a fixed metallic tube with a coned lens at one end and an adjustable slit is called.

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Telescope

Collimator

Tumtable

Grating

The unit of intensity level is.

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Watt

Joule

Bel

Sabin

Which is the branch of medicine that deals with the anatomy physiology and diseases of the eye.

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Ophthalmology

Psychology

Andrology

Gynecology

The sweetness or harshness of a sound depends upon its

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Wavelength

Frequency

Amplitude

Regularity

A uniform vertical wire is stretched by hanging a mass from its lower end Which of the following does ot effect the strain in the wire.

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The stress

The upstretched length

The load applied

the Young's modulus of the metal

The centre of gravity of an object is also called.

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Centre of buoyancy

Centre of mass

Centre of the body

Torque

The specific heat of a substance is a function of its

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mass

Weight

Volume

Molecular structure

at room temperature the p.d. between the two sides of depletion region for silicon is of the order of.

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0.3 V

0.5 V

0.7 V

0.9 V

What is the power factor of LR circuit.

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Unity

Zero

infinity

Between 0 and 1

Human's eye acts like a

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LASER

Mirror

Lens

Fibre optics

In rectifiers silicon junction diodes are preferred to germanium type because.

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They are cheaper

They are durable

Their much lower reverse current makes them more efficient

Of their geometry

Which quantity is common for systems in thermal equilibrium.

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Heat

Temperature

Momentum

Specific heat

The charge on an Isolated conductor always lies.

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Within the conductor

At the centre of the conductor

On the surface of the conductor

Outside the surface of the conductor

Which field is produced by electric charge on a body at rest.

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Electric field only

Magnetic field only

Neither electric nor magnetic field

Both electric and magnetic fields

The materials whose resistivity becomes zero below a certain temperature.

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Semi conductors

Super conductors

Insulators

conductors

What is the effect on the product of resistivity and conductivity if the temperature of a conductor is increased.

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It decreases

It increases

It remains the same

It may increase or decrease

Two pure inductors each of self inductance L are connected in parallel The total inductance of the combination is.

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L

2L

L/2

L/4

Compton scattering experiment seemed to indicate that radiation had

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Wave nature

Particle nature

Wave particle nature

X-rays nature

Below which temperature gas can be liquified by increasing its pressure.

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Natural temperature

Boyle temperature

Critical temperature

Absolute zero

An ideal voltage source has zero.

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Current

Electromotive force

Voltage

Internal resistance

Which thermodynamic law state taht the entropy of a perfect system approaches zero.

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Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

One gray is equal to.

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1 J-1 kg -1

1 J -1 kg -2

1 J 1 -g-1

1 j kg -2

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