Question # 1

Relation between pressure (P) and energy (E) of a gas is

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P = 2/3 E

P = 1/3 E

P = 3/2 E

P = 3 E

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

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

In an L-R circuit time constant is that time in which current grows from zero to the value

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0.63 I_o

0.50 I_o

0.73 I_o

I_o

The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much estimate of the kinetic energy obtained by measuring mass and speed

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11%

8%

5%

1%

If a diamagnetic substance is brought near north or south pole of a bar magnet it is

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Attracted by the poles

Repelled by the poles

Repelled by north pole and attracted by the south pole

Attracted by the north pole and repelled by the south pole

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

Which of the following is equal to:

joule x ohm / volt x second ?

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Ampere

Volt

Watt

Tesla

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

If the amplitude of sound is doubled and the frequency reduced to one-fourth the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

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

When the length of a microscope tube increase, its magnifying power

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Decreases

Increases

Does not Change

May increase or decrease depending on the observer and the place of observation

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

Who explained the origin of the Fraunhoffer lines?

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Fraunhoffer

Kirchhoff

Fresnel

Snell

Two sources of sound are said to be coherent if

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They produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase different all instant of time

To increase the magnification of a telescope

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The objective lens should be of large focal length and eyepiece should be of short focal length

The objective and eyepiece both should be of large focal lengths

Both the objective and eyepiece should be of smaller lengths

The objective should be small focal length and eyepiece should be of large focal length

A cable that can support a load W is cut into two equal parts. The maximum load that can be supported by either part is:

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W/4

W/2

W

2W

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when:

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q = Q/4

q = Q/2

q = Q

None of these

What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

A bullet is shot from a rifle. As a result the rifle recoils. The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen

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Half the image will disappear

No change either in size or in intensity

Intensity of image will increase

Intensity of the image will decrease

What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value, the mass remaining constant?

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12

6

3

2

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