Question # 1

In which case dose the potential energy decreases?

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On compressing a spring

On stretching s spring

One moving a body against gravitational force

One the rising of an air bubble in water

A wire is stretched to double of its length.The strain is

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2

1

Zero

0.5

A train of 150 m length is going towards north direction at a speed of 10 ms^-1 A parrot flies at a speed of 5 ms^-1 towards south direction parallel to the railway track,The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

If the earth were to rotate faster than its present speed the weight of an object will

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Increase at the equator but remain unchanged at the poles

Decrease at the equator but remain unchanged at the poles

Remain unchanged at the decrease but decrease at the poles

Remain unchanged at the equator but increase at the poles

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

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 will become

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-10N

+10N

+20N

-20N

What is the average energy of N molecules of monoatomic gas?

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1/2 NkT

NkT

3/2 NkT

5/2 NkT

The time period of a simple pendulum is 2 seconds if its length is increased by 4 times then its period becomes

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16 s

12 s

8 s

4 s

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

A p-n junction has a thickness of the order of:

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1 cm

1 mm

10^-6cm

10^-12cm

In Which case does the potential energy decreases?

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On compressing a spring

On stretching a spring

One moving a body against gravitational force

One the rising of an air bubble in water

When a hydrogen atom is bombarded, the atom is excited to the n = 4 state of hydrogen atom. The energy released when the atom falls from n = 4 state to the ground state is

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1.275 eV

12.75 eV

5 eV

8 eV

The unit of inductance is equivalent to

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V x s/A

V x A/s

A x s/v

V/A x s

When n-type of semiconductor is heated

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Number of electrons increases while that of holes decreases

Number of holes increases while that of electron decreases

Number of electrons and holes remains same

Number of electrons and holes increases equally

A fly is sitting on the objective of a telescope pointed towards the moon.

What effect is expected on the photography of the moon taken through the telescope?

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The entire of view blocked

There is an image of the fly on the photography

There is no effect at all

There is a reduction in the intensity of the image

A particle moving in a magnetic field has increase in its velocity, then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

A particle is moving in a uniform magnetic filed, then

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its momentum changes but total energy remains the same

Both momentum and total energy remains the same

Both changes

Total energy change but momentum remains

The peak voltage in 220 volt A.C. supply is nearly

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220 volt

253 volt

311 volt

440 volt

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

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