Question # 1

Which base units would be needed to express the SI unit of potential difference.

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Kg and A only

m , s and A

kg, m, s and A

mg, m and s

The dimensions of torque are.

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[MLT-2]

[ML-1T-1]

[ML2T-2]

[ML-2]

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

If the earth stopped rotating the weight of objects at either pole would.

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Be grater

Be less

Vary with altitude

Be the same before

The maximum height reached by a projectile with a velocity of 14 m s-1 at an angle of 30 ^owith the horizontal is.

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1.5 m

2.5 m

1 m

2 m

The amplitude of a vibrating body placed in a resistive medium.

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Increases exponentially with time

Decreases exponentially with time

Remains constant with time

Cannot be observed

In rotational motion, the analogue of force is.

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moment of inertia

Moment of force

Torque

Rotational inertia

If two bodes are under a collision that is not perfectly elastic then.

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K.E. is conserved but momentum is not

Momentum is conserved but K.E. is not

Neither K.E. nor momentum is conserved

Both K.E. and momentum are conserved

The curve between the acceleration and velocity of a body in SHM is a

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Circle

Ellipse

Square

Parabola

If a force 5 N applied parallel to a moment arm 5 m then torque will be

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0 N m

5 N m

10 N m

25 Nm

Two forces act together on an object the magnitude of their resultant force is minimum when they act at

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0 ^o

45^oC

90^o

180 ^o

When a body acceleatres.

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Its direction always chances

It mass always changes

It velocity always changes

It falls towards the earth

The dimensions of force are.

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[MLT-2]

[MLT-1]

[M,-1T-2]

[M-2T-2]

For which of the following objects is the centre of mass equidistant from every point on its surface

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An unsharpened pencil

A gramophone record

An egg

A table tennis ball

The escape velocity

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Is independent of mas of the body

Increases with the increases of mass of the body

Decreases with the decreases of mass of the body

Depends upon the type of body used

A man of mass 100 kg is standing in an elevator. The net force acting on the man reads its weight when the elevator is going up with acceleration 4 m s-2 would be.

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100 N

590 N

490 N

980 N

What must be changing when a body is accelerating uniformly.

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Force acting on the body

Mass of the body

Speed of the body

Velocity of the body

The point of which an applied force produces a linear acceleration but no rotation is called.

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Centre of the body

Centre of the mass

Centre of gravity

Weight of the body

The value of 'g' is maximum

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Above the earth's surface

Below the earth's surface

At the earth's surface

At the centre of earth

Simple harmonic motion may be assumed as a projection of uniform circular motion along a

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Diagonal

Hypotenuse

Radius

Diameter

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