Question # 1

Current per unit area is called.

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Electric potential

Current density

Charge density

Electric intensity

If we double both the current and the voltage in circuit while keeping its resistance constant the power.

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Remains unchanged

Halves

Doubles

quadruples

The gravitational force between two bodies does not depends upon.

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The product of their masses

Their separation

The sum of their masses

The constant of gravitation

The X-rays coming from a X-rays tube

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Is monochromatic

Has all wavelengths smaller than a certain maximum wavelength

Has all wavelengths greater than a certain maximum wavelength

has all wavelengths minimum than a certain maximum wavelength

An Alpha particle is the same as

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A helium nucleus

A high speed electron

A hydrogen nucleus

Electromagnetic radiation of short wavelength

A transistor consists of.

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One p-n junction

Two p-n junctions

Three p-n junctions

Four p-n junction

Which BJT configurations used for signal inversion.

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CE

CC

CB

BE

An A.C. dynamo operates on the principle of

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Mutual induction

Self induction

Electromagnetic induction

Mechanical induction

Two charged spheres are separated by 2 mm Which of the following would produce the greatest attractive force.

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+1 q and + 4 q

-1 q and -4 q

+2 q and +2 q

+2 q and -2q

Which of the following radiations will burn human skin

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Infrared

Ultraviolet

X rays

Alpha particles

If the cross sectional area of the pipe decreases the speed of the fluid increase according to.

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Venturi relation

Bernoulli's equation

Equation of continuity

Torriculli's theroem

A LASER beam may be used to measure very large distance because it is.

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Unidirectional

Coherent

Monochromatic

Massive

The index of refraction for a substance is

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Constant

Constant for a given wavelwngth

Variable with the speed of light

Never constant

Which particle has zero charge and zero rest mass.

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Neutron

Proton

Electron

Photon

Which parameter determines the brightness of a light source sensed by an eye.

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Light energy entering the eye

Wavelength of light

Total radiant flux entering the eye

Total luminous flux entering the eye

Which one among these contacts in a transistor is non rectifying.

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Base

Emitter

Collector

None of these

How much would be the volume of ice formed by freezing 1 litre of water.

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1.0 litre

1.09 litre

1.90 litre

2.0 litre

The direction of force on a moving negative charge will be.

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Opposite to that of positive charge

Similar to that of positive charge

At right angel to the positive charge

Parallel to the positive charge

The normal Human body temperature in Fahrenheit scale is.

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32 ^oF

40 ^oF

98.4^oF

212 ^oF

If a force 5 N applied parallel to a moment arm 5 m then torque will be

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0 N m

5 N m

10 N m

25 Nm

The force that moves a rocket or a plane forward is called.

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Lift

drag

Thrust

Turbulence

Who developed the first atomic reactor.

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Bohr

Fermi

Rutherford

Taylor

Who first studied the visible region of hydrogen spectrum.

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Lyman

Pfund

Balmer

Brackett

A bus and a car moving with the same K.E. are acted upon by the same retarding force then the

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car will stop first

Bus will stop first

Both will stop simultaneously

Both will never stop

Which of the following is a non contacting device that intercepts and measures thermal radiation.

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Thermometer

Pyrometer

Voltmeter

Lactometer

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

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Rotatory

Vibratory

Translatory

Random

The process where by energy is dissipated from the oscillating system is called.

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Resonance

Damping

Forced oscillation

Free oscillation

The erecting lens of a telescope produces

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A shorter instrument

wider field of view

A larger image

A sharp image

Who discovered a phenomenon of thermos electricity.

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Peltier

Joule

Seeback

thomson

The impedance of the circuit at resonance frequency is

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Minimum

Maximum

Zero

Infinity

Difference between the molar heat capacity constant pressure and that a constant volume is equal to

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Root mean square velocity

Mean free path

Boltzmann's constant

Universal gas constant

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