Question # 1

The velocity of an object when projected from the earth in order to escape the earth's gravitational field is called the.

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Terminal velocity

Average velocity

Instant aeneous velocity

Escape velocity

The value of 'g' is affected by earth's

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Non spherical shape

Daily motion

Volume

Density

Which of the following physical quantity has different units as compared to others.

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Weight of a body

Tension of a string

Buoyant force

Electromotive force

If a force of 10 N makes an angle of 30 ^o with x-axis its component is given by

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1.866 N

8.66 N

0.89 N

0.866 N

Which of the following quantities associated with SHM does not vary periodically.

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velocity

Displacement

Acceleration

Total energy

MT-2 is the dimensionless formula of.

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Moment of iniertia

Viscosity

surface tension

Angular acceleration

If an athlete uses 50 J of energy to lift a load in 2 s his muscular power is.

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125 W

250 W

500 W

1,000 W

Which example best illustrates the conservation of electrical energy to chemical energy.

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Starting a car

Generating hydroelectric power

Changing an accumulator

Melting a fuse

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

A bus and a car moving with the same K.E. are acted upon by the same retarding force then the

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car will stop first

Bus will stop first

Both will stop simultaneously

Both will never stop

When the lift is moving upward with an acceleration then weight of the object will be.

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w = ma

w - ma

w

2 w

The point of which the whole weight of the body acts

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zero point

Centre of mass

Centre of gravity

Equilibrium

In rotational motion the quantity which plays the same role as the inertial mass in rectilinear motion.

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Angular momentum

Linear momentum

Moment of inertia

Torque

The product of force and duration of impact is called.

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Density

Momentum

Torque

Impulse

While passing through the atmosphere total energy is reduced due to.

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scattering

Absorption

Reflection

All of these

The SI unit of angular velocity is.

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cm s-1

rad s-2

cm s-2

rad s-1

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

Periodic motion is a motion.

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Under the influence of an elastic restoring force

That repeats it self in equal intervals of time

Back and forth over the same path

With constant acceleration

When a person holding a pall is moving in the forward direction, the work done on the pall is

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Positive

Negative

Zero

Equal to gravity

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

The horizontal range is equal for the angles.

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30 ^o and 45 ^o

30 ^oand 60 ^o

45 ^o and 90 ^o

60 ^oand 75 ^o

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