Question # 1

A charge less region which separates p-type and n-type semiconductors in a p-n junction is known as.

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Polar region

Null region

Depletion region

Neutral region

The relation between horse power and watt is.

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1 hp = 546 watts

1 hp = 746 watts

1 hp = 946 watts

1 hp = 1000 watts

Who was the author of Mathematical principles of Natural philosophy.

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Kepler

Einstein

Max Planck

Newton

What type of process is the Carnot's cycle.

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Reversible

Irreversible

Neither reversible nor irreversible

May be reversible or irreversible

Which of the following pairs represent units of the same physical quantity.

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Kelvin and joule

Kelvin and calrorie

Newton and calorie

Joule and calorie

Which of the following is basic transistor configuration.

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CB

CC

CE

All of these

The measure of how strongly a material oppose the flow of electrical current is known as

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Electrical resistivity

Specific electrical resistivity

Volume resistivity

All of the above

The speed of the charging or discharging a capacitor depends upon the product of resistance and.

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Current

Voltage

Capacitance

Potential difference

How much large is the proton mass than the electron mass.

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1536

1636

1736

1836

linear magnification is the ratio between the

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Distances of object and image from mirror

Distances of object and image from the focal point

Distance of image and object from the mirror

Distance of image from object and the distance of object from mirror

If work must be done by an outside agent attempting tobring two point charges close together.

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They are of opposite signs

The field is not conservative

The work is recoverable when they separate

The P.E. of the charges is reduced by the amount of the work done

A fixed pulley is emplyed to

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Do some work

Change the directionof force

Do more work with the same force but without using the pulling

Have mechanical advantage greater than 1

The line passing symmetrically though the optical center of the lens is.

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Focal plane

Principal focus

Principal axis

Focal length

The critical mass of a fissionable material is.

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1 kg

10 kg

100 kg

1.,000 kg

A frictionless heat engine can be 100% efficient only if its exhaust temperature is

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Equal to the input temperature

Less than the input temperature

0 ^oC

0 K

Which is the thick circular structure in teh eye containing an aperture with variable diameter It controls the amount of light reaching the retina.

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Retina

Iris

Pupil

Cornea

The force of gravity between two objects does not depend upon the.

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Constant of gravitation

Separation

Product of their masses

Sum of their masses

Internal energy of a gas decreased when

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It gains heat

Change in cycle

Change in adiatatic

Change in reversible

An ideal engine can be 100% efficient only if its exhaust temperatute.

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Equal to input temperature

Less than is input temperature

More than its input temperature

0 ^oC

The function of collimator in spectrometer is to

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Disperse the light

Reflect the light

Make the light parallel

Diffract the light

A radiation spectrum which is continuously distributed over a frequency region without being broken up into lines or bands is known as.

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Continuous spectrum

Band spectrum

discrete spectra

Absorption spectrum

The circumference of earth was measured by

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Alberuni

Alkundi

Ibn al haithem

Issac Newton

Which particles have spin quantum number 1/2

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Mesons

Laptons

Hadrons

Muons

Which of the following is not true.

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Velocity can be nagative

Velocity is a scalar

Speed is a vector

Speed can be negative

In open circuit electromotive force equal to

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Current

Resistance

Voltage

Inductence

What would be the magnitude and direction of acceleration which would made the spring balance reading zero.

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Zero

1 m s-2 upward

9.8 m s-2 upward

9.8 m s-2 downward

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

If the earth stopped rotating the weight of the object at the equator would.

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Be greater

Be same as before

Be less

Very with altitude

The presence of a magnetic field can be detected by a

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Small mass

Stationary positive charge

Stationary negative charge

Magnetic compass

The electrons behave as wave because.

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They can be diffracted by a crystal

They can be defecting by magnetic field

They can be deflecting by electric field

they can produce ions in gases

The rest mass of a particle is independent of the

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Wavelength of the particle

Mass of the particle

Speed of the particle

Energy of the particle

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