Question # 1

A pure choke consumes

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No power

Maximum power

Minimum power

Average power

What will be the effect on the speed of a Transerv wave in a string. If tension is made 4 times.

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Remains the same

Increase a times

Becomes double

Becomes 3 times

Which particle are not emitted by a radioactive substance.

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Alpha particles

Beta particles

Gama particles

Neutrons

A polaroid is

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A red light filter

A device used for a analyzing polarized light

A device used in polarimeter

An adjustable shutter

In water drops rainbows are formed by

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Reflection

Refraction

Dispersion

All of these

In case of stationary waves every particle of the medium has fixed

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Velocity

Displacement

Amplitude

Phase

Which of the following is a mechanical wave.

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X rays

Radio waves

Sound wave

Light wave

The gas temperature is increased from 27 ^oC to 127 ^oC What is the ratio of mean kinetic energies.

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3/4

4/3

9/10

10/9

When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.

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An increase in pressure

An increase in temperature

A change in phase

A change in entropy

The continuous x rays spectrum is obtained due to

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Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

When a liquid is hated retaining its liquid sate then its molecules gain.

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K.E.

P.E

Heat energy

Chemical energy

Which form of electromagnetic radiation is used in RADAR.

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Long wavelength ultraviolet waves

short wavelength microwaves

short wavelength infrared wave

Long wavelength radiowaves

Super conductor are used in

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Fast computer chips

Magnetic resonance imaging

Magnetic levitation trains

All of the above

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

Light entering glass will not suffer change in

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Wavelength

Direction

Velocity

Frequency

A body travels with a speed greater than the speed of sound What would be the wave front shape.

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Ellipitical

Spherical

Conical

Parabolical

The corss product of two vectors is zero when they

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Are parallel to each other

Are perpendicular to each other

Are at an angle of 120 ^o

Both are equal

When an arrow is shot from a bow, it has K.E. which is given to it by

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The elongated tail

The stretched string of bow

The throw of archer

The sharp arrows head

A force applied at centre of mass of a body

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Does not produce any torque

Produces torque

Produces acceleration

Produce couple

Lines of Balmer series are emitted by hydrogen atom when the electron jumps from

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The first orbit to any other orbit

Higher orbits to second orbit

Higher orbits to first orbit

The third orbit to higher orbit

When a solid is melting the temperature remains constant even through heat is being supplied because the

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Heat is being used to break up the intermolecular bonds

Solid is not absorbing any heat

Molecules are moving faster

Molecules are farther a part

Positron was discovered by

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Wilson

Anderson

Dirac

Stefan

When a balloon sticks to the whiteboard It is an example of.

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Conoduction

Induction

Polarization

Conservation of charge

Which is the health care profession concerned with eyes as well as vision visual system and vision information processing in humans.

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Optometry

Ophthalmology

Telemetry

Psychology

A cup of coffee at 80 ^oC is left to cool to 30 oc if the heat capacity of the cup and coffee is 2.0 kJ k-1 how much heat is released during the cooling.

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0.04 kJ

100 KJ

60 kJ

160 kJ

Since a diode permits the flow of current only in one direction so it can be used as.

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An oscillator

A rectifier

A phot deflector

A transistor

Which of these is not a method of charging.

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Friction or rubbing

Induction

Contact or touching

Convection

If the transformer turns ratio is 2 and the impedance of primary coil is 250 Ohms then the impedance secondary coil will be.

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125 Ohms

250 Ohms

500 Ohms

1000 Ohms

The exitance of antiparticle was discovered by

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Wilson

Anderson

Dirac

Stefen

Which of the following proves that light waves are transverse in nature.

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Diffraction

Interference

Polarization

Refraction

The circuit of full wave rectification consists of

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Only one diode

Two diodes

Three diodes

Four diodes

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