Question # 1

The centre of gravity of an irregular shaped object lies at

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The intersection of diagonals

The intersection of medians

Its centre

The axis of rotation

The dimensions of work are

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[MLT-2]

[ML2T-2]

[ML2T-1]

[MLT-1]

A spring of force constant k is out into three equal pats. The force constant of earth part will b e.

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k

3 k

k/3

k/2

If mass attached to a spring increases then its time period.

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Increases

Decreases

Remains constant

Decreases slightly

The product of force and duration of impact is called.

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Density

Momentum

Torque

Impulse

The SI unit of angular momentum is.

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kg m-1 s

kg m2 s

kg m s-1

kg m2 s-1

If the resultant of all the forces acting on a body is zero then the body is in

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Translation equilibrium

Rotational equilibrium

Equilibrium

Dynamic equilibrium

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 corss product of two vectors is zero when they

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Are parallel to each other

Are perpendicular to each other

Are at an angle of 120 ^o

Both are equal

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

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

An astronaut in an earth satellite will observe the sky as

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Light blue

Deep blue

White

Black

The centre of gravity of a body is

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The centre of the body

The point at the mass of the body acts

The point at which the whole weight of the body acts

The point of rotation

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

The term radius of gyration relates to.

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Moment of force

Moment of inertia

Law of gravitation

simple harmonic motion

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

Which vector gives the displacement from one point another in space.

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Null vector

Position vector

Unit vector

Distance vector

A fixed pulley is emplyed to

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Do some work

Change the directionof force

Do more work with the same force but without using the pulling

Have mechanical advantage greater than 1

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 centre of mass of a system is a point where an applied force causes the system to move.

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With rotation

Without rotation

Fastly

Slowly

Ethanol is a replacement of

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Gasoline oil

Kerosene oil

Refinery oil

vegetable oil

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