Question # 1

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

The work required to lift a ball of mass 'm' from the surface of the earth to an infinite distance is

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Absolute P.E. of the body

P.E of the body

K.E. of the body

Chemical energy of the body

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

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

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

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

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

In a projectile motion, the horizontal range depends upon.

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Initial velocity

Velocity at the highest position

angel of projection

Vertical component of velocity

A body is equilibrium may not have

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Momentum

Velocity

acceleration

K.E.

The SI unit of momentum is.

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kg m s-2

kg m2 s-2

kg m s-1

kg s-1

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

If the presence of air friction, the path of a projectile appears as.

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Straight line

Parabola

Hyperbola

zig zag

The diver spins faster when moment of inertia becomes

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Smaller

Greater

Double

zero

The Circular motion of a particle with constant speed is.

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Periodic and SHM

Periodic but not SHM

linear and SHM

Neither periodic nor SHM

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 dimensions of torque are.

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[MLT-2]

[ML-1T-1]

[ML2T-2]

[ML-2]

Which pair of the following forces has a resultant force of 2 N.

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1 N and 1 N

1 N and 3 N

1 N and 2 N

2 N and 2 N

Linear acceleration of a point moving in a circle of radius 30 cm with angular acceleration of 0.5 rad s-2 is

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1.5 cm s-2

2.5 cm s-2

10 cm s-1

15 cm s-2

If a car is to gain momentum it must.

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Lose inertia

accelerate

Move rapidly

Lose weight

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