Question # 1

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60km/h. His average speed will be

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40 km/h

48 km/h

50 km/h

60 km/h

Tick the conservative force:

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tension in a string

Air resistance

Elastic spring force

Frictional force

A body walks to his school at a distance of 6 km with a speed of 2.5 km/h and walks back with a constant speed of 5 km/h. His average speed for round trip expressed in km/h is

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24/13

10/3

3

4,8

Swimming becomes possible because of______law of motion:

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First

Second

Third

None of these

If m means mass of gases objected per second from a rocket and v shows the change in velocity, than mv is named as:

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Force

Energy

work

impulse

During the upward motion of the projectile, the vertical component of velocity.

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Decreases

Increases

Remains constant

None of these

If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

Inertial frame of references are those frame of references which are moving with

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increasing velocity

decreasing velocity

constant velocity

all of them

Acceleration in a body is always produced in the direction of :

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Velocity

Weight

Force

Both B and C

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

At the top of the trajectory of a projectile the acceleration is

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The maximum

The minimum

Zero

g

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

Tick the conservation force:

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Tension in a string

Air resistance string

Elastic spring force

Frictional force

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

A the top of the trajectory of a projectile, the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Anitparallel to each other

An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The bomb strikes the ground, at point B. The distance AB is

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1200 m

0.33 km

3.33 km

33 km

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

Which of the following statements for an object in equilibrium is not true?

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The object must be at rest

The object can be at rest

The object is moving at constant speed

The acceleration of the object is zero

When brakes are applied to a fast moving car, the passenger will be thrown:

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Forward

Backward

Downward

none of these

A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/s^s)

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9.8 m

14.7 m

4.9 m

19.6 m

The path (or trajectory) described by a projectile is

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a parabola

a hyperbola

a circle

a straight line

When a person jumps off the ground, the reaction force of the ground is

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greater than the weight of the person

smaller than the weight of the person

equal to the weight of the person

zero

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to

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Four times

Thrice

Once

Twice

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine, is (Take g=9.8 m/s²)

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9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

Which one of the following is dimensionless.

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Acceleration

Velocity

Density

Angle

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

A body whose momentum is constant must have constant

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Acceleration

Velocity

Force

None of these

A body is moving with constant velocity of 10 m/sec in the north east direction. Then its acceleration will be:

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10 m/sec2

20 m/sec2

30 m/sec2

Zero

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