Question # 1

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

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permanent

temporary

either of them

none of them

The waves which propagate by the collision of material particles are known as

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e.m. waves

mechanical waves

light waves

microwaves

Rice takes longest to cook

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In a submarine 100 m below the surface of the sea

At sea level

At Murree

At Mount Everest

Potentiometer is more sensitive than voltmeter, because

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Voltmeter has a very high resistance

Voltmeter has a very low resistance

Potentiometer does not draw any current from a source of unknown potential difference

Potentiometer is sensitive

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

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transformer

rectifier

filter

none of these

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

The current is measured in

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volts

watt

ampere

ohm

The instantaneous velocity is define as the limiting value of Δd/Δt on the time intervalΔt approaches to

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zero

maximum

minimum

infinity

The induced current in a conductor depends upon

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

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-10 N

+10 N

+20 N

-20 N

The typical wavelength of the signal which we sent in the optical fibre is

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1000 nm

100 m

1.3 mn

1.3μm

A particle moves along a circular path under the action of a force.The work done by the force is

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Zero

Positive and non zero

Negative and non zero

None of above

The brilliance of diamond is

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Entirely due to refractive index

Entirely due to total internal reflection

Partly due to total internal reflection

None of the above

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

Which of the following can become a good permanent magnet?

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iron

steel

both of them

none of them

In compound microscope image formed is

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Real erect and diminished

Virtual inverted magnitude

Real inverted and magnified

Virtual inverted and magnified

a constant force F is applied to keep the particle moving with uniform velocity V.Then the power required is

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1/2 FV²

FV²

FV

F/V

Which of the following colors suffers maximum deviation in a prism?

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Yellow

Blue

Green

Orange

One year is equal to

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4.3 × 10¹⁰ sec

4.4 × 10⁸ sec

3.12 × 10⁷ sec

3.2 × 10⁶ sec

Stress may cause a change in:

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Length

Volume

Shape

Any of these

None of these

Just before setting the sun may appear to be elliptical This happens due to

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Diffraction

Reflection

Dispersion

Refraction

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