Question # 1

A force of 50 N acts on a body for 10 s the change in momentum will be.

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5 N s

200 Ns

500 Ns

800 N s

The resultant of two force 3 N and 4 N making an angle 90 ^o with each other is.

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1 N

3 N

5 N

10 N

The process where by energy is dissipated from the oscillating system is called.

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Resonance

Damping

Forced oscillation

Free oscillation

An example of simple harmonic motion is

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Fast moving cricket ball

Motion of bicycle

Motion of a bee

Motion of simple pendulum

a 5 kg mass is falling freely the force acting on it will be.

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0 N

9.8 N

5 N

19.6 N

If a body a moving with constant acceleration the velocity time graph will be a

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zig zag

Straight line

Constant value

zero value

Conservation of energy means that

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Energy can be destroyed but not created

Energy can be created but not destroyed

energy cannot be created and destroyed

Energy can neither be created nor destroyed

Which quantity has different base units from the other three.

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Density x volume x velocity

Rate of change of momentum

The Young's modulus x area

Weight

Which of the following quantity has a unit that can be expressed in terms of just two different SI base units.

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Area

Change

Electric current

Length

The acceleration due to gravity

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Has the same value everywhere in space

Has the same value every where on the earth

varix with altitude on the earth

Is great her on the moon owing to its smaller diameter

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

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Force

Angular momentum

Linear momentum

Linear impulse

For maximum range angle of projection of the projectile should be

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45 ^o

90^o

120 ^o

180 ^o

A force passing through the centre of gravity of a body

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Causes its translational motion

Causes its rotational motion

Holds the body in equilibrium

Produces both translational and rotational motion.

Which of the following will not acceleation.

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The moon in its orbit

A tennis ball rebounding from ground

A store in free fall

A car in which the engine thrust is equal to the friction

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

Torque is equal to.

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The product of magnitude of force and acceleration

The product of magnitude of force and momentum

The product of magnitude of force and displacement

The product of magnitude of force and angular velocity

A body of mass 3 kg lies on the surface of the table 2 m high it is moved on the surface 4 m the change in P.E. will be.

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9.8 J

6 J

Zero

329 J

The rate of change of momentum of a body falling under gravity is equal to its.

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P.E.

K.E

Weight

Density

When a man jumps off the ground, the reaction force of the ground is.

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Equal to the weight of the man.

Smaller than the weight of the man

Greater than the weight of the man

Zero

It the force acting on a body is doubled its acceleration becomes.

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Half

Constant

Double

One fourth

The SI unit of gravitational constant G is.

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kg m-1 s-1

kg m2 s-2

kg m3 s-2

kg m2 s-1

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