Question # 1

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentum

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

In a capacitive circuit

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Current leads voltage by phase of π/2

Voltage leads current by phase of π/2

Current and voltage are in same phase

Sometime current and sometime voltage leads

The twinkling of stars is due to

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The fact that stars do not emit light continuously

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of them

A sun rise or sun set, the sun looks reddish because.

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

Which of the modulus of elasticity is involved in compressing a rod to decrease its length?

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Young's modulus

Bulk modulus

Modulus of rigidity

None of the above

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in he form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

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

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Ultraviolet

Infra red

Visible

X-ray

The contrast in the fringes in any interference pattern depends on

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Fringe width

Intensity ratio of the sources

Distance between the slits

Wavelength

Which of the following is the only vector quantity

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Temperature

Energy

Power

Momentum

The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV?

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28

7

4

1

The motion without consideration of its cause is studied in

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Kinematics

Mechanics

Statics

Modern Physics

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 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

Angular momentum is

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Vector (axial)

Vector (polar)

Scalar

None of these

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

Copper and germanium are cooled to 70K from room temperature, then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

Mechanical waves on the surfaces of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

Which of the following four statement is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

The half-life of a radio-isotope is 5 years. The fraction of atoms decayed in this substance after 15 years will be

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1

3/4

7/8

5/8

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