Physics · JEE

Important Questions: Work done by a constant force and a variable force, kinetic and potential energies, work-energy theorem, power for JEE

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The most important Work done by a constant force and a variable force, kinetic and potential energies, work-energy theorem, power questions for JEE cover conceptual traps, standard results, and numerical patterns from Work done by a constant force and a variable force, kinetic and potential energies, work-energy theorem, power. Goodmarks provides 46+ high-yield MCQs with full solutions.

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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?

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What makes a Work done by a constant force and a variable force, kinetic and potential energies, work-energy theorem, power question "important" for JEE?

Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

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Key areas include Work done by a constant force and a variable force, kinetic and potential energies, work-energy theorem, power. Prioritise these before moving to edge cases.

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