Question # 1

When the amplitude of a wave become double, its energy becomes

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One half

Two times

Three times

Four times

The work done by centripetal force is

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(-)ve

(+)ve

Maximum

Zero

Force 12 N and 5 N are add, the resultant con not be

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13 N

6 N

7 N

17 N

The artificial satellites are held in orbits by

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Gravitational force

Electric force

Magnetic force

All of these

When a fore of 100 N is acting on an object along x-axis then its vertical component will be.

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50 N

0 N

25 N

10 N

The dimensions of angular velocity are

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[LT-1]

[LT-2]

[T-1]

[L-1T-1]

The formula of centripetal acceleration is

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The regular or steady flow of fluid is called

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Stream line

Turbulent flow

Average flow

None of these

The molecules of an ideal gas exert

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Force on each other

No force on each other

Large force on each other

Pressure on each other

In stationary waves, the particle velocity at nodes is

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Minimum

Maximum

Zero

Constant

For angular momentum of system to remain constant, external torque should be.

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Small

Large

Zero

None

Weight of a 60 kg man in moving elevator with constant acceleration of 1/2 f

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Zero

300 N

600 N

200 N

The speed of stars and galaxies can be calculated by

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Compton effect

Stefan's law

Doppler's effect

Pascal's law

In the absence of air resistance the acceleration of a body will be

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Uniform

Variable

Instantaneous

None of these

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

For a rocket , the change in momentum per second of the ejecting gases is equal.

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Acceleration of the rocket

Momentum of rocket

Velocity of rocket

Thrust acting on rocket

Maximum number of components of a vector may be

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Infinite

One

two

three

An immediate source of energy for our body is:

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mango

Glucose

mushroom

meat

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