Physics · JEE

Work done by a constant force and a variable force, kinetic and potential energies, work-energy theorem, power Mock Test for JEE

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Syllabus context

Part of Work, Energy and Power in JEE Main Physics.

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Q1PhysicsUnit 4: Work, Energy and Power

Which one of the following statement is false?

Q2PhysicsUnit 4: Work, Energy and Power

A body of mass 5 kg has momentum of

10 \mathrm{kg} \mathrm{m} / \mathrm{sec} .

When a force of

0.2 \mathrm{N}

is applied on it for 10 sec, the change in its kinetic energy is:

Q3PhysicsUnit 4: Work, Energy and Power

The graph between the resistive force acting on a body and the position of the body travelling in a straight line is shown in the figure. The mass of the body is

25 \mathrm{kg}

and initial velocity is 2 m/s.When the distance covered by the bodyi

s 4 \mathrm{m},

its kinetic energy would be

Q4PhysicsUnit 4: Work, Energy and Power

\mathbf{A}

3 k g

object has initial velocity

(6 \hat{i}-

\mathbf{2} \hat{\boldsymbol{j}}) \boldsymbol{m} / \boldsymbol{s} .

The total work done on the object if its velocity changes to

(8 \hat{i}+

4 \hat{j}) m / s

is :

Q5PhysicsUnit 4: Work, Energy and Power

Potential energy is classified into which two energy?

Q6PhysicsUnit 4: Work, Energy and Power

Which of the following forms of energy is released or absorbed in most chemical reactions?

Q7PhysicsUnit 4: Work, Energy and Power

A boy throws a ball of mass

0.5 \mathrm{kg}

upwards with an initial speed of

14 \mathrm{m} / \mathrm{s}

The ball reaches a maximum height of 8m. The amount of energy dissipated by air drag acting on the ball during the ascent is

Q8PhysicsUnit 4: Work, Energy and Power

A bullet is fired at a target with a velocity

80 \mathrm{m} / \mathrm{s}

and penetrates

50 \mathrm{cm}

into it. If this bullet were fired into a target

25 \mathrm{cm}

thick with equal velocity, with what velocity would it emerge, supposing the resistance to be uniform and the same in both the cases?

Q9PhysicsUnit 4: Work, Energy and Power

A ball falls freely under gravity from rest. Name the kind of energy it will possess at the point from where it falls:

Q10PhysicsUnit 4: Work, Energy and Power

Identify the energy changes in the following two cases -

A: A

car moving up a hill B : Photographic film is exposed to sun- light

Q11PhysicsUnit 4: Work, Energy and Power

A uniform chain of length

2 m

is kept on a table such that a length of

60 \mathrm{cm}

hanging freely from the edge of the table. The total mass of the chain is

4 k g .

The work done is pulling the entire chain on the table (Take

\left.g=m s^{-2}\right)

Q12PhysicsUnit 4: Work, Energy and Power

Force acting on a particle moving in a straight line varies with the velocities of the particle as

\boldsymbol{F}=\boldsymbol{K} . \boldsymbol{V} .

Where

\boldsymbol{K}

is constant. The work done by this force in time

t

Q13PhysicsUnit 4: Work, Energy and Power

5 ~ k g

stone falls from a height of

1000 m

and penetrates

2 m

in a layer of sand. The time of penetration is

Q14PhysicsUnit 4: Work, Energy and Power

A retarding force is applied to stop a train. The train stops after 80 m. If the speed is doubled, then the distance travelled when same retarding force is applied is

Q15PhysicsUnit 4: Work, Energy and Power

An object mass

10 \mathrm{kg}

falls from rest through a vertical distance of

10 \mathrm{m}

and acquires a velocity of

10 \mathrm{m} / \mathrm{s}

. The work done by the push of air on the object is

\left(g=10 m / s^{2}\right)

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