Question # 1

Teh speed of sound in air is 340 m/s. If the pressure of air is doubled then the speed becomes.

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Double

Half

Four times

Remains same

Which remains constant in an adiabatic process.

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Volume

Pressure

entropy

temperature

Direction of angular acceleration is always along

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x-axis

y -axis

z-axis

The axis of rotation

The formula of centripetal acceleration is

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The formula for the power is

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P= W/d

P=W/v

P=W/t

P=Wt

Work is negative when angle between F and d is

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45^o

₀^o

90^o

180^o

The direction of angular velocity is determined.

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Left hands rule

Head to tail rule

Right hand rule

General rule

A vector is denoted by

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Light face

Bold face

Both a and b

None of these

Total change in momentum of an isolated system is

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Always (+) ve

Always (-) ve

Has maximum value

Zero

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

Waves transport energy without transporting

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Matter

Force

Momentum

All of these

If r = 5 m and f = 4 N are along same direction, them torque is

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20 Nm

5 Nm

10 Nm

Zero

The energy processes, we use are

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Efficient

Not efficient

Reversible

None of these

Entropy of measure of.

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Internal energy of system

Order of system

Disorder of system

Potential energy of system

In simple harmonic motion the velocity of a particle is maximum at.

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Extreme position

Mean position

In between extreme and mean position

None of them

Artificial gravity can be created in the space ship by

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Revolving around the earth

Spinning around its own axis

Increasing its velocity

Decreasing it svelocity

Apparent weight of a man is in upward accelerated lift will

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Increases

Decreases

Remain same

Increases then decrees

If a rocket is accelerating upward with an acceleration of 2 g, an astronaut of weight, mg in the rocket shows apparent weight.

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Zero

Mg

2 mg

3 mg

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