Question # 1

In an elastic collision

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K.E. is conserved

Both K.E. and momentum are conserved

K.E. is not conserved

Only momentum is conserved

Plane polarized light can be produce dby

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Simple reflection

Double refrraction

Scattering of light

All of these

When a ray light is incident at anacute angle to the boundary of the media the refracted ray.

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Bends away from the normal

Bends towards the normal

Remains undedicated

Is totally reflected

Which phenomenon is responsible formation of shadows.

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Interference of light

Diffraction of light

Polarization of light

Propagation of light

The property of an object that causes it to create a magnetic field in opposition to an externally applied magnetic field is.

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Paramagnetism

Diamagnetism

Ferromagnetism

Demagnetism

A darling ion amplifier is characterized by

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High voltage and current gain

High input resistance and current gain

High output resistant and current gain

Low input resistance and current gain

An astronaut in an earth satellite will observe the sky as

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Light blue

Deep blue

White

Black

During solid ficain the temperature.

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Remains constant at the freezing point

Increases at the freezing point

Decreases at the freezing point

Decreases at the melting point

What will be the sound speed if the frequency is doubled.

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zero

Half

Double

Unchanged

Magnetic moment is a

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Scalar

Vector

Phasor

Tensor

The sum of positive and negative peak values are usually written as.

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rms value

p-p value

Peak value

Instantaneous value

Mean free path of gas molecules is inversely proportional to its

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Volume

Pressure

Temperature

Size

Which type of amplifier causes minimum drain of power supply.

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Class -A

Class -B

Class-C

Class -AB

Which instrument measures properties of light over a specific portion of the electromagnetic spectrum.

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Photometer

Spectrometer

Hydrometer

Lactometer

The relationship between mass number atomic number and neutron number is.

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A = Z + N

A = Z - N

Z = A + N

N = Z - A

Ethanol is a replacement of

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Gasoline oil

Kerosene oil

Refinery oil

vegetable oil

A voltmeter is a

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High resistance galvanometer

Low resistance galvanometer

Zero resistance galvanometer

Infinite resistance galvanometer

A ball mass 0.25 kg is thrown to a height of 20 m The change in G.P.E is

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49 J

50 J

-75 J

500 J

In electric magnetism , the additional fundamental quantity that is chosen as a basic unit is called.

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Electric potential

Electric fierce

Electric charge

Magnetic force

As the mass number increases, the binding energy per nucleon in a nucleus

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Increases

Decreases

Remain constant

Varies in a way that depends upon A

Which of the following measures how quickly the thermometer liquid mainly because it

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Is coloriess

Is a bad conductor of heat

Does not expand linearly

Has a low boiling point

When a beta particle travels though a medium it knocks out electrons from the atoms due to.

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Gravitational force of attraction

Electrostatic force of repulsion

Nuclear force

Electromagnetic induction

Which mirror be used for obtaining a parallel beam of light from a small lamp.

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Plane mirror

Convex mirror

Concave mirror

All of these

Potential of earth's surface is.

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Negative

Positive

Zero

Infinite

Which scientist announced for the first time that the universe is expanding.

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Einstein

Newton

Edward Hubble

Karl Marx

Which experiment confirmed the de Broglie hypothesis.

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Double slit experiment

Division germier experiment

Schrodinger's Cat experment

Bohr's experiment

When a light ray enters from air into water then its wavelength.

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Increases

Decreases

Become infinity

Remains constant

On which temperature scale a degree is 1/180 of the interval between the freezing point and the boiling point.

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Celsius scale

Fahrenheit scales

Rankine scale

Kelvin scale

If a charged body is moved against the electric field it will gain.

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P.E

K.E.

Electrical P.E.

Gravitational energy

What kind of movement is dictated by the laws of thermodynamcis.

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Energy motion

Heat work

Light heat

Energy light

Contrivances for converting heat into work are called.

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Heat pumps

Heat engines

IC engines

Jet engine

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