Question # 1

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

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100 m/sec

140 m/sec

1960 m/sec

196 m/sec

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

A train is moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction. The relative velocity of train with respect to car is

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17 m/s

33 m/s

17.5 m/s

none

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

In the expression F x t, the force F is

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total force

instantaneous force

average force

all of them

Newton's first law is also called:

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Law of torque

Law of force

Law of inertia

None of these

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

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

When a body is moving with uniform positive acceleration, the velocity- time graph is a straight line. Its slope is

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zero

negative

positive

non-existing

The product of force and time is called change in:

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Momentum

Impulse

Force

Both a and b

A particle of mass 0.5 g moving along x-axis is located of x₁= 15 m at t₁= 5s and x₂= 33 m at t₂= 13s its average velocity is

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6 m s^-1

2.45 m s^-1

2.25 m s^-1

4.45 m s^-1

A train of 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot files at a speed of 5 ms^-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

The velocity of a projectile is maximum

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at the point of projection

just before striking the ground

at none of them

at both of them

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

Choose an answer

100 m/sec

140 m/sec

1960 m/sec

196 m/sec

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

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

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Physics ECAT Pre Engineering Chapter 3 Motion and Force Online Test MCQs With Answers

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