Question # 1

Two simple pendulums of the same length but having different masses

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Have different frequencies

Will have period proportional to their masses

Will have periods independent of their length

Have the same period

Which of the following is the magnitude of the gravitational force and is not the inherent property of the body.

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Mass

Weight

Speed

Length

A man in an elevator descending with an acceleration will conclude that his weight has

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Increased

Decreased

Constant value

Zero value

A force of 20 N is applied on an elastic spring if the extension produced in the springs to cm, the value of spring constant.

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2 Nm-1

20 N m-1

200 N m-1

2,000 N m-1

a 2,000 kg heavy truck travelling at 36 km h-1 strikes a tree and comes to a stope in 0.1 s The average force on the truck during the crash is.

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2 x 10² N

2 X 10³N

2 X 10⁴ N

2 X 10³ N

If the K.E. of a body becomes 4 times of its initial value, the new momentum will be

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half

Same

Double

4 times

In an ideal case, when no K.E. is lost the collision is.

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Perfectly elastic

Perfectly inelastic

May or may not be elastic

May or may not be inelastic

The centre of the sun produces a large amount of energy what is the source of this energy.

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Chemical reaction

Nuclear fission

Nuclear fusion

Radioactive decay

Ethanol is a replacement of

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Gasoline oil

Kerosene oil

Refinery oil

vegetable oil

When a force of 4 N acts on a body of mass 2 kg for a time of 2 s, the rate of change of momentum is.

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2 kg ms -1

4 kg ms-1

8 kg m s-1

16 kg m s-1

If the dot product of two non zero vectors vanishes the vectors will be.

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any scalar quantity

Any negative number

Its magnitude but not direction

Its magnitude and direction

When net force acting on a system is zero which of the following will be constant.

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Force

Linear momentum

Angular momentum

Linear impulse

If velocity is doubled then

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Momentum increase 4 time and K.E. increase 2 times

Momentum increases 2 times and K.E. remains constant

Momentum increases 2 times and K.E. increases 4 times

Both momentum and K.E. remain constant

when a body accelerates.

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Its direction always changes

Its mass always changes

Its velocity always changes

It falls towards the earth

Original source of biomass is.

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Stars

Moon

earth

Sun

Impulse is equal to.

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F x t/2

\F x t /4

F x t

F x t /m

The gravitational field strength at a point p on the earth's surfae is numerically equal to.

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The acceleration of free fail at p

The change in P.E. per unit distance at P

The work done in bringing unit mass from infinity to P

When a vector is multiplied by a negative number its direction.

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Remains unchanged

Changes by 180 ^o

Becomes horizontal

Vertical to each other

Which one of the following pairs does not have the same dimensions.

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Force and weigfht

Pressure and stress

Capacitance and resistance

Energy and work

For the angular momentum of a system to remains constant, the external torque should be

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small

Large

Neither small nor large

zero

When damping is small amplitude of vibrational resonance will be

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small

Large

Infinite

Un changed

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