Question # 1

If a ball was thrown out of a rocket in free space, then it would.

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Accelerate away from the rocket

Remain motionless after leaving the rocket

Travel rectilinearly with constant speed

Move always parallel to the rocket

If two non zero vectors are perpendicular to each other than their scalar product is equal to

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1

-1

0

infinity

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

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

A mason of 9.8 N weight is climbing on a 20 m high ladder The P.E. of mason at the middle of the ladder is.

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98 J

196 J

960 .4 J

1920 .8 J

Inertial mass and gravitational mass are

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Opposite

Proportional

Weights

Inversely proportional

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 relation between horse power and watt is.

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1 hp = 546 watts

1 hp = 746 watts

1 hp = 946 watts

1 hp = 1000 watts

Supplementary units radian and steradian were established for

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Density

Viscosity

electric intensity

Geometrical quantities

The centre of gravity of an object is also called.

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Centre of buoyancy

Centre of mass

Centre of the body

Torque

The moment of inertia depends upon

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Mass of the body and its radius

Mass of the body and its angular speed

Mass and angular momentum

Mass as well as the distribution w.r.t axis of rotation

A body of mass 8 kg moves along a circle of radius 4 m with constant speed of 88 m s-1 The centripetal force on the body is.

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10 N

128 N

48 N

148 N

The SI unit of torque.

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kg m2

kg ms-2

kg m2 s-2

kg ms -1

Kinetic and potential energies are

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Not inter convertible

Inter convertible

Two forms of torque

Not related with each other

Rate of change of momentum is called.

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Torque

Force

Impulse

Inertia

The graph between restoring force and time in SHM is a

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Straight line

Parabola

Sine wave

Circle

Which vector can be used to locate the centre of mass of a collection of particles.

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Null vector

Unit vector

Position vector

Distance vector

A rocket propulsion is based on the principle of.

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Conservation of momentum

Conservation of mass

Conservation of energy

Floatation

Which of the following is not an elastic collision

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A man jumps on a cart

A bullet embedded in a block

Colliding of two glass balls

Colliding of two tennis balls

Two forces each of 10 N magnitude act on a body It the forces are inclined at 30 ^o and 60 ^o with x-axis, then the x-component of their resultant is.

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10 N

1.366 N

13.66 N

1.35 .6 N

Resonance phenomenon in a vibrating body

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May increase the amplitude

May decrease the amplitude

May not affected the amplitude

All of the above

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