Question # 1

Surface tension of water is due to

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Inter molecular attraction

Intermolecular spaces

Inter molecular repulsion

None of above

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

Which of the following particle would experience the largest magnetic force when projected with the same velocity perpendicular to a magnetic field?

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Proton

Electron

He⁺

Li⁺

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

Light appears to travel in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

Both transverse and longitudinal

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

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4 : 5

7 : 9

16 : 25

1 : 1

According to the Hooke's law the force required to change the length of a wire by '1' is proportional to

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1^-2

1^-1

1

1²

The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to

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√V

V²

1/√V

1/V

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

A prism splits a beam of white light into its seven constituent colors this is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

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