Question # 1

In red light is used as compare to blue light then fringe spacing.

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Decreases

Remain same

Increases

Becomes zero

Which one of the followign Muslim mathmatision determined the earths circumference.

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Al Beruni

Ibn Sina

Al Khawrizmi

None of these

According to Newton's formula, the speed of sound in air at STP is

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332 ,ms-1

340 ms-1

350 ms-1

280 ms-1

Which one is a conservative force

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Elastic spring force

Air resistance

Frictional force

Tension in the spring

According to first law of thermodynamics the quantity which is conserved.

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Force

Momentum

Energy

Power

The behaviour of gases is discussed by

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Knowing their nature

Knowing their temperature

Kinetic theory

Maxwell's theory

The flow of a fluid is of

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One type

Two types

Three types

Four type

The pitch of sound deepens upon

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Intensity of sound

Loudness of sound

Wavelength of sound

Frequency of sound

Blood pressure is measured by

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Hydrometer

Barometer

Sphygmomanometer

Galvanometer

A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.

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100%

70%

60%

50%

Total change in momentum of an isolated system is

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Always (+) ve

Always (-) ve

Has maximum value

Zero

Identity the non conservative force among the following.

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Frictional force

Electrical force

Gravitational force

Elastic restoring force

the angular version of F= ma is

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L = 1w

pi = 1a

l = pi a

f = mv/t

For working of heat engine, there must be

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A source

A sink

Ether of these

Both of them

The resultant of two forces 3 N and 4 N acting at right angle to each other is

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7 N

5 N

4 N

1 N

Boltzman constant 'k' has same unit as.

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Temperature

Energy

Entropy

Pressure

The equations of angular motion hold only in case when the axis of rotation is

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Moving

Fixed

Both a and b

None of these

The increase in thermal pollution of environment means.

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Increase in the entropy

Decrease in the entropy

Entropy remains constant

Entropy becomes zero

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