Question # 1

The diver spins faster when moment of inertia becomes

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Smaller

Greater

Double

zero

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

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

The time period of a simple pendulum is independent of its.

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Length

Mass

Acceleration due to gravity

Restoring force

Newton's first law of motion provides the definition of.

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Distance

Force

Vector

Acceleration

Conventionally antilock wise torque is taken as.

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Zero

Positive

Infinity

Negative

Distance covered by a freely failing body in 2 s will be.

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19.6 m

4.m

39.2 m

44.1 m

Which quantity has different units from the other three.

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Density x volume x velocity

Rate of change of momentum

Young's modulus x area

Weight

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

Unit vector of a vector A describes

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Magnitude of a given vector

Direction of given vector

Shape of a given vector

Magnitude and direction of a given vector

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

Ethanol is a replacement of

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Gasoline oil

Kerosene oil

Refinery oil

vegetable oil

The escape velocity from the earth's surface is

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1.2 km s-1

1.7 km s-1

10.2 km s-1

11.2 km s-1

The maximum height reached by a projectile with a velocity of 14 m s-1 at an angle of 30 ^owith the horizontal is.

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1.5 m

2.5 m

1 m

2 m

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 term radius of gyration relates to.

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Moment of force

Moment of inertia

Law of gravitation

simple harmonic motion

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

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

Which of the following is not a unit of plane angle.

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Degree

Radian

Gradian

Steradian

The SI unit of spring constant is identical with that of.

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Force

Pressure

Surface tension

Loudness

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