Question # 1

Which of the following is equal to:

joule x ohm / volt x second ?

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Ampere

Volt

Watt

Tesla

One cannot see through fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

As the electron in Bohr orbit of hydrogen atom passes from stat n = 2 to n = 1 the kinetic energy K and potential energy U change as

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K two-fold,U also two-fold

K four-fold,U also four-fold

K four-fold,U two-fold

Two points charges A and B separated by a distance R attract each other with a force of 12 x 10^-3 N. The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

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 difference all instant of time

At a certain instant a stationary transverse wave is found to have maximum kinetic energy the appearance of string of that instant is:

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

The dimensional formula of toque is:

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[ML²T²]

[MLT²]

[ML^-1T^-2]

[ML^-2T^-2]

At 0° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational enegy

Density

In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie

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Ultraviolet

Infra red

Visible

X-ray

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

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both (A) and (B)

None of these

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