Question # 1

Total change in momentum of an isolated system is

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Always (+) ve

Always (-) ve

Has maximum value

Zero

The diver spin faster when moment of inertia becomes.

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smaller

Greater

Constant

Equal

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

When two waves having same frequency traveling in same direction combine, phenomenon is called

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Wave motion

Combination of waves

Interference

Diffraction

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

Two vector can be added by simple arithmetical method when they are at an angle of.

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120^o

90^o

0^o

45^o

The flow of a fluid is of

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One type

Two types

Three types

Four type

In case of planets centripetal force is provided by

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Coulomb's force

Electrostatic force

Gravitational force

Magnetic force

Height of geo stationary orbit of the satellite above the earth is.

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300 km

250 km

400 km

None of these

If an object is placed with in the focal length of a convex lens, its image is formed.

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Real

Inverted

Virtual

Smaller than object

One complete round trip of a vibrating body is called.

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Frequency

Time period

Vibration

Amplitude

The SI units of flow rate are.

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m2s-1

m3s-2

m3s-1

m2s-2

Average translational K.E. of molecules for an ideal gas is given as

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1/2 KT

KT

2/3 KT

3/2 KT

Environmental crisis are also known as

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Population crisis

Entropy crisis

War crisis

Mass crisis

Energy dissipated usually appears as

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P.E.

Heat Energy

Chemical energy

Nuclear Energy

The ability of a body to do work is called its

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Force

Power

Capacity

Energy

The apparent change in the pitch of sound due to relative motion is called.

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Carnot theorem

Interference

Doppler effect

Beats

Let A = Area of cross section of pipe, v = speed of fluid, then 'Av' is called.

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Volume flow rate

Energy flow rate

Mass flow rate

Pressure flow rate

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