Question # 1

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

K two fold, U four fold

In a simple harmonic motion the kinetic energy (KE) and the potential energy (PE), are such that throughout the motion

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KE remains constant

PE remains constant

KE/PE is constant

KE+PE remains constant

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentum

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

The dimensional formula for the modulus of elasticity is same as that for:

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Stress

Strain

Velocity

Surface tension

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

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

To explain his theory Bohr used

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Conservation of linear momentum

Conservation of angular momentum

Conservation of quantum frequency

Conservation of energy

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

A man pushes a wall but fails to displace it. He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

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Double the earlier value

Unchanged

More than doubled

Less than doubled

If the dot product of two non-zero vectors vanishes, the vectors will be

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In the same direction

Opposite to each other

Perpendicular to each other

Zero

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^-1towards 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

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

When light wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however, light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters?

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1 : 2

2 : 1

4 : 1

1 : 4

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

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