Question # 1

If a gas does 10 J of external work white expanding then the change in internal energy is equal to.

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0 J

10 J

-10 J

100 J

The moment of inertia of a body comes in action in

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Circular motion

Straight line motion

Curved path

zig zag motion

The total energy of the hydrogen atom is

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zero

Infinite

positive

Negative

At which temperature a ferromagnetic material becomes paramagnetic on healing.

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Kelvin temperature

Celsius temperature

Curie temperature

Fahrenheit temperature

The mains frequency in Pakistan is

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20 Hz

50 Hz

40 Hz

60 Hz

Infrared radiation is also known as

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Radio signals

Heat radiation

Magnetic resonance waves

RADAR

In the experiment of production of X rays the anti cathode should be bombarded with.

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A particles

Beta particles

Electrons

Protons

A point source of light is situated at large distance The nature of the wave front at the point will be.

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Cylindrical

Spherical

Plane

Ellipical

Equipotential surfaces in an electric field are always.

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Spherical

Closed surfaces

Tangent to electric lines of force

Perpendicular to electric lines of force

Frequency less than 120 Hz are known as

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Infrasonic

Ultra sonics

Super sonics

Infrared

Reversible alternation of the form of dimensions of a solid body under stress and strain is called.

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elastic limit

Plastic limit

elestic deformation

Plastic deformation

Which one of the following is an example of a reversible process.

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Work done against friction

Heat produced by current

Melting of ice

See back effect

An electric motor could be used as a

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Battery

Capacitor

Dynamic

Transofrmer

During an adiabatic gas expansion the environment

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Serves as a heat sink

Serves as a heat source

Must be at a higher temperature than the gas

Does not have to participate

If the wavelength of a wave is 1 cm and its period is 0.02 s , velocity of the wave will be

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20 cm s-1

50 m s-1

60 cm s-1

100 cm s-1

A positive and a Negative charge are initially 4 cm apart When they are moved closer together so that they are now only 1 cm part the force between them is.

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4 times smaller than befor

4 times larger than before

8 times larger than before

16 times larger than before

The emf induced by the motion of a conductor across a magnetic field is called.

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Absolute potential

Motional emf

Induced emf

Terminal potnetial

An oscillator is basically an amplifier with loop gain

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Zero

Less than unity

More than unity

Infinity

Which of the following has maximum specific heat.

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Glass

Iron

Brass

Lead

What is the mean free path in a gas.

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The distance travelled by a molecule before hitting a wall

the average distance travelled by a molecule in one second

the average distance travelled by molecules in one second

The root mean square velocity

Which of the following colours of light passes through glass with minimum speed.

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Green

Yellow

Red

Violet

A body of mass 2 kg is suspended in a elevator by means of a spring The balance reads its weight when the elevator moves up with an acceleration of 5 m s-2 as.

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9.8 N

29. 6 N

26.5 N

30.5 N

Conservation of energy means that

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Energy can be destroyed but not created

Energy can be created but not destroyed

energy cannot be created and destroyed

Energy can neither be created nor destroyed

A photon is chasing an electron, whose speed is 0.9 c What is their relative speed.

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0.1 C

C

0.8 C

0.9 C

On increasing the temperature of source efficiency of Carnot engine.

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Increase

Decrease

First increases and then decreases

Does not change

Clouds are white because they efficiently scatter sunlight of all

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Colours

Wavelengths

Frequencies

Phases

When a ray of light travelling in a denser medium enters into a rarer medium.

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It remains undeviated

It is reflected back

It bends towards the normal

It bends away from the normal

When ever a system is made to complete a cyclic process the work done during the complete cycle.

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Is zero

Is negative

Is positive

Depends upon the path followed

The charge per unit volt which is a constant property of the system is known as the

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Dielectric constant

Permitivity

Capactance

Inductance

Magnetic fields do not interact with

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Stationary electric charges

Stationary permanent magnets

Moving electric charges

Moving permanent magnets

The Beta particles move along.

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Straight path

Curved path

Zig Zag path

Circular path

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