Question # 1

A body whose momentum is constant must have constant

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Acceleration

Velocity

Force

None of these

The dimension of linear inertia is:

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MLT²

ML°T^-2

ML°T°

MLT^-1

Acceleration of a body is negative if the velocity of the body is

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constant

increasing

decreasing

none of them

If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is

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a = M/mv

a = mM/v

a = mv/M

a = v/mm

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

A ball of mass m moving with uniform speed collides elastically with another stationary ball. The incident ball will lose maximum kinetic energy when mass of the stationary ball is

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m

2 m

4 m

Infinity

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

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Forward

Backward

Downward

none of these

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

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Velocity

Weight

Force

Botha B and C

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow

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a circular path

a straight line

a hyperbola

a parabola

Distance traveled by a body falling from rest in the first, second and third second is in the ration of

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1 : 2 : 3

1 : 3 : 5

1 : 4 : 9

None of the above

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

The slopes of the tangent at any point on the curve gives the value of the

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average velocity at that point

instantaneous velocity at that point

average acceleration at that point

instantaneous acceleration at that point

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

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0.1 m/s

10 m/s

1 m/s

0.01 m/s

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

Tick the conservation force:

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Tension in a string

Air resistance string

Elastic spring force

Frictional force

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

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