Question # 1

If a car is to gain momentum it must.

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Lose inertia

accelerate

Move rapidly

Lose weight

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

In an elastic collision

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K.E. is conserved

Both K.E. and momentum are conserved

K.E. is not conserved

Only momentum is conserved

The rate of change of angular momentum of a body is equal to.

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Applied force

Moment of inertial

Applied torque

Impulsive force

The cross product of two vectors is magnitude when

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Vectors are parallel

Vectors are antiparallel

Vectors are perpendicular

They are rotated through 270^o

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 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

A body of mass 2 kg is suspended from the celling of an elevator moving up with an acceleration 'g' its apparent weight in the elevator will be.

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9.88 N

19.8 N

29.4 N

39. 2 N

If the roads are not banked

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A vehicle will turn over

A vehicle will not travel along with curve

Tyres and bearing are damaged

Roads will be spoiled

Where should be the centre of gravity of a body.

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It must be within the body

It must be outside the body

It may be near but not essentially within the body

It changes its position after sometime

When velocity of the body is doubled, which one is doubled too.

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K.E.

P.E

Momentum

Acceleration

Original source of biomass is.

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Stars

Moon

earth

Sun

The unit of energy are the same as that of

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Force

Power

Work

Efficiency

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

The SI unit of coefficient of viscosity of

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kg m s-1

kg m-1 s-1

kg ms -2

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

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Non spherical shape

Daily motion

Volume

Density

The reverse process of vector addition is called

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Negative of a vector

Subtraction of vectors

Resolution of vectors

Multiplication of vector

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

Which of the following is not SI base unit.

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kilogram

Ampere

Coulomb

Mole

If the dot product of two non zero vectors vanishes the vectors will be.

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any scalar quantity

Any negative number

Its magnitude but not direction

Its magnitude and direction

If the rate of change of momentum w.r.t Time is zero then

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Momentum is a function of time

Momentums is not conserves

Momentum is constant

The impulse is into he same direction as the momentum

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