Question # 1

The SI unit of torque is

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kg ms-2

kg m2s-2

kg ms-1

kg m2 s-3

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

Which of the following is a non conservative force.

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Gravitational force

Air resistance

Elastic force

Tension in a string

If a car is to gain momentum it must.

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Lose inertia

accelerate

Move rapidly

Lose weight

If gravitational field is not uniform over the extended object or system of point masses the centre of mass and centreof gravity will

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Be antiparallel

Not coincide

Coincide

Be perpendicular

Which quantity has dimensions different from the others.

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Energy per unit volume

Force per unit area

Angular momentum per unit mass

Pressure

If a vehicle is to gain momentum it must

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Lose weight

Move slowly

Lose inertia

Accelerate

Which of the following is not true.

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Velocity can be nagative

Velocity is a scalar

Speed is a vector

Speed can be negative

A girl weighing 400 N takes 4 s to run up the stairs How much P.E. does she gain if height of the stairs is 3 m.

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120 J

400 J

200 J

1200 J

If two different masses have same momentum then the lighter one has more.

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K.E. and velocity

Velocity only

Both K.E. and P.E.

Only P.E

The equal and opposite forces acting on a body form

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Angular momentum

Linear momentum

Torque

Couple

The pascal is not the SI derived unit of.

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Pressure

Stress

work

Tensile strength

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

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Half

Constant

Double

One fourth

The Circular motion of a particle with constant speed is.

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Periodic and SHM

Periodic but not SHM

linear and SHM

Neither periodic nor SHM

The field in which the work done is independent of the path followed.

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Conservative field

Electric field

Magnetic field

Non conservative field

In microwave ovens, heating is produced by the phenomena of

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Reflection

Refraction

Damped oscillations

Resonance

Solar cells are thin sand whishes of

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good conductors

Bad conductors

Semi conductor

Insulators

the consumption of energy by a 60 watt bulb in 2 s is

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0.02 J

30 J

120 J

60 J

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

The SI unit of density is.

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kg m2

kg m-2

kg m-3

kg m2 s-2

Which of the following quantity is zero about the centre of mass of baody.

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Mass

Acceleration

Moment

Angular momentum

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