Download Class 9 Chapter 5 Physics Exercise Short Questions PDF for quick revision and exam preparation. This PDF is helpful for 9th class students who want to prepare important exercise short questions according to the new syllabus. Students can use it to revise chapter-wise questions, improve their concepts, and prepare better for school tests and board exams.
Chapter 5 Short Questions: Work, Energy and Power
These are the exercise short questions from Chapter 5 of the Class 9 Physics textbook. In this chapter you are expected to be able to state, from memory and in two or three lines:
- Work, its formula, and the condition under which it is zero.
- Kinetic and potential energy, with the formula for each.
- The law of conservation of energy.
- Power, its formula and its SI unit.
- Efficiency, and why it never reaches one hundred per cent.
- Renewable against non-renewable energy sources.
Wording That Costs Marks in This Chapter
Short answers in Work, Energy and Power are marked on precision rather than length. These are the specific slips that lose marks here:
- Saying work is done whenever a force acts, without the displacement condition.
- Writing kinetic energy without the half.
- Giving power the unit of joules rather than watts.
Working Through the Set
Cover the answer, write your own version, then compare. Recognising a correct answer is not the same as producing one, and only writing exposes the difference. Mark yourself as strictly as an examiner would: if the unit is missing, count the mark as lost. Come back to anything you got wrong two days later rather than the same evening.
Frequently Asked Questions
When is the work done equal to zero?
When the displacement is zero, when the force is zero, or when the force acts at right angles to the displacement. Holding a heavy bag while standing still does no work in the physics sense.
Is this PDF free and based on the new syllabus?
Yes to both. It is free with no sign-up, and it follows the current Class 9 Physics textbook, in which Work, Energy and Power is Chapter 5 of nine.
Related Class 9 Physics Resources
For the reasoning answers from the same chapter see the Chapter 5 constructive questions, and test yourself with the Chapter 5 online test. Continue with Chapter 4 and Chapter 6, or sit a full paper from the 25 Class 9 Physics guess papers. Everything else is on the Class 9 Physics page.