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

A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

A non-inertial frame of reference is that frame of reference in which

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a = 0

a > 0 or a < 0

v = 0

none of them

A body whose momentum is constant must have constant

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Acceleration

Velocity

Force

None of these

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

Which quantity has the same dimension as that of impulse?

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KE

Power

Momentum

Work

Distance covered by a freely failing body n the first second of its motion will be:

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4.9 m

9.8 m

19.6 m

29.4 m

Flight of rocket in the space is an example of

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Newton's first law

Newton's third law

Newton's second law

all of them

If the velocity time graph is a straight line parallel to the time-axis, then it means:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of these

Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s²

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0.064 m

640 cm

64 cm

64 m

In equation F=ma, then mass 'm' is

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rest mass

variable mass

inertial mass

gravitational mass

When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

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In the backward direction on the front wheel and in the forward direction on the rear wheel

In the forwards directions on the front wheel and in the backward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

If the acceleration of a body is not uniform, then velocity-time graph will be:

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Curve

Straight line

Sphere

All of these

Body which falls freely under gravity provides good example of motion under:

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Uniform acceleration

Non-uniform acceleration

Uniform velocity

None of these

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

In an elevator moving vertically up with an acceleration 'g' the force exerted on the floor by a passenger of mass M is

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Mg

1/2 Mg

Zero

2 Mg

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a ballon

Suppose the water flows out from a pipe at 3kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, then the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

The three equation of motions are useful only for

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linear motion with increasing acceleration

line motion with uniform acceleration

linear motion with zero acceleration

linear motion with varying acceleration

The expression F x t is called impulse if the time 't' is

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zero

very large

very small

infinite

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

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