Question # 1

At high temperature a body generally emits redactions of.

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Small wavelengths

Long wavelengths

Moderates wavelengths

Zero wavelengths

The centre of mass of a system is a point where an applied force causes the system to move.

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With rotation

Without rotation

Fastly

Slowly

Stationary waves only a discrete set of frequencies are set up in a medium. This fact is called.

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Harmonics

Overtones

Quantization of frequencies

Superposition of frequencies

If temperature of the sink is decreased the efficiency of a Carnot engine

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Increases

Decreases

Remains constant

First increases and thend ecreases

Linear magnification is equal to the ratio of.

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Size of the object to the size of the image

Size of the image to the size of the object

size of the object focal length

Size of the image focal length

If a capacitor is charged by using a 1.5 V battery, how much charge will capacitor gain.

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0 V

0.5 V

1.5 V

3 V

Which Muslim Scientist is regarded as father of optics.

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Ibn al Haithem

Al khawarizmi

Nasir al Din Al tusi

Ibn Musa al khawarzmi

Which of the following is an electrostatic generator.

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Winshurst machines

Van de Graff generator

Electrophorus

All of the above

A diver leaving the diving board makes a somer sault in the air.

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This is due to gravitational force

The moment of inertia is decreased during the turn

His moment of inertia is increased

He pushes at the air for making the true

In an electronic transition atom cannot emit

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Gama rays

Visible rays

Infrared rays

Ultraviolet rays

Velocity of sound in any medium deepness upon.

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Elasticity

Density

Volume

Mass

Who introduced the concept that an atom posses quantized energy levels.

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Raman

Bohr

Newton

Fermi

Positron are produced during.

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Annihilation

ionization

Pair production

x rays production

In the experiment of photo electric effect the minimum frequency of photons at which electrons are emitted from a metal surface is called.

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Critical frequency

Typical frequency

Threshold frequency

Surface frequency

The source of magnetic field are

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Isolated magnetic poles

Electric charge distributions

Current loops

Solenoids

The efficiency of Carnot engine is

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Less than one

Zero

Greeter than one

Infinite

One Tesla is equal to.

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1 N A-1

1 N m-1

1 N A -1 m

1 N A -1 m-1

The amplitude of sound wave determines its

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Pitch

Loudness

Reverberation

Interference

Which phenomenon is responsible formation of shadows.

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Interference of light

Diffraction of light

Polarization of light

Propagation of light

The process of pair production will take place if the energy of photon is greater than

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

The cathode ray oscilloscope is used

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For viewing the wave shape of rapidly changing electric current

As voltmeter

For measuring time intervals between electricalimpulses

All of the above

An electric motor could be used as a

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Battery

Capacitor

Dynamic

Transofrmer

Drag force between two layers under consideration depends on

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Distance between the layers

Surface area of layers

Relevant velocity between them

All of the above

Wave length of a LASER can be sued as a standard of.

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Angle

Time

Length

Temperature

The unit of intensity level is.

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Watt

Joule

Bel

Sabin

To reduce spherical aberration in optical instruments which of the following should be used.

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Plano convex lenses

Concave lenses

Spherical mirrors

Plane mirrors

A force passing through the centre of gravity of a body

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Causes its translational motion

Causes its rotational motion

Holds the body in equilibrium

Produces both translational and rotational motion.

Heat Carnot be transferred from a colder to a hotter region unless work is done This is the statement of.

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Firs law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamcis

When a body acceleatres.

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Its direction always chances

It mass always changes

It velocity always changes

It falls towards the earth

When the temperature of a body is equal to that of the surrounding then the body appears

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Dull black

Red hot

In thermal equilibrium

To be cold

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

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