Question # 1

In projectile motion, the body has

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One component of velocity

Two components of velocity

Three components of velocity

No component of velocity

A force of 50 N acts on a body for 10 s What will be change in momentum.

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5 Ns

500 Ns

200 Ns

800 N s

The term radius of gyration relates to.

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Moment of force

Moment of inertia

Law of gravitation

simple harmonic motion

The equal and opposite forces acting on a body form

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Angular momentum

Linear momentum

Torque

Couple

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

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Null vector

Position vector

Unit vector

Distance vector

The angular frequency time period and frequency in SHM not depend upon.

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Mass

Force constant

Amplitude

Restoring force

Original source of biomass is.

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Stars

Moon

earth

Sun

The magnitude of the instantaneous velocity is called the.

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_Displacement

Speed

Acceleration

Length

An astronaut in an earth satellite will observe the sky as

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Light blue

Deep blue

White

Black

Oscillatory motion is always under

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An applied force

Restoring force and inertia

A periodic force

A gravitational force

Which one of the following is not true.

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velocity can be negative

velocity is a vector

Speed is a sccalar

Speed can be negative

Which of the following type of force can do no work on the particle on which it operates.

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Gravitational force

Frictional force

Centripetal force

Elastic force

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

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

A diver leaving the diving board makes a somer sault in the air.

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This is due to gravitational force

The moment of inertia is decreased during the turn

His moment of inertia is increased

He pushes at the air for making the true

The dimensions of moment of inertia are

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[ML2]

[MLT-1]

[ML2T-1]

[ML-1T-2]

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

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

Which of the following is an example of negative work.

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a thrown up cricket ball

Grass mower

A car on road

Bucket in the well

The force of friction that comes into action after the motion has started

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Static friction

Dynamic friction

Friction only

Limiting friction

If the vector sum of all the torques is zero then

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1st condition is satisfied

2nd condition is satisfied

Centre of mass is lowered

Gravity becomes zero

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