Toppers Study Toppers Study Toppers StudyGet complete NCERT Solutions for 9 Science 11. Work and Energy with detailed explanations. Easy-to-understand answers to help students study effectively and score better.
Get complete NCERT Solutions for 9 Science 11. Work and Energy with detailed explanations. Easy-to-understand answers to help students study effectively and score better.
Preparing for exams becomes easier with Additional -Questions. Whether you are studying for board exams or mid-term exams, 9 Science Chapter 11. Work and Energy solutions provide quick revising points, well-structured answers, and additional practice material to help you score better.
ncert_solutionsWork and Energy
Que. – Define 1 J of Work?
Ans. – When a force of 1 N moves a body by a distance of 1 m in its own direction is equal to 1 j . It is said to be work has been done.
Que. – What is kinetic energy?
Ans. – The energy possessed by a body by virtue of in motion is called kinetic energy.
Kinetic Energy of a Body = ½ mv2
Examples : - Moving objects like Bullet, Falling water, etc.
Que – What is Power? Write it’s S.I unit.
Ans. – Power is the rate of doing Work or the rate of utilizing energy. The power of an agent may vary with time. Power is denoted by English alphabet P. And its S.I unit is Watt.
Que. – Write two conditions for work to be done.
Ans. – (a) A force should act on an abject.
Que. – What is work?
Ans. – When the force acts in the direction of displacement is said to be work has been done. It is equal to the product of the force and displacement.
Work done = force ´ displacement.
Que. – S. I unit of work.
Ans. – Joule (J)
1 KJ = 1000J
Que. – What is Potential energy?
Ans. – The Potential energy possessed by the object is the energy present in it by virtue of its position or configuration. Such a energy is called Potential energy.
Potential energy = mgh
Examples – Pulled rubber band, stored water on height, Pulled spring, an arrow and stretched string on bow etc.
Que. - Write the law of conservation of energy.
Ans. – Energy can only be converted from one form to another. It can neither be created nor destroyed. The total energy before and after the transformation remains the same. This law is valid in all situation and transformation. That is called the law of conservation of energy. r
Que. – What is mechanical energy?
Ans. - The sum of kinetic energy and Potential energy of an object is its total Mechanical energy.
Que. – On which factors the done work on an object is depended?
Ans. – There are two factors:
Que. – What is S.I Unit of commercial Energy?
Ans. – Kw/h (Kilowatt/hour )
Que. – Define 1 unit of commercial Energy.
Ans. – The consumption of electric energy by 1 kilowatt in an hour is called 1 unit.
Que – What is transformation of energy?
Ans. – When a kind of energy converts into another kind of energy is called transformation
of energy.
Additional -Questions are created by experts to give step-by-step explanations. Around 60–70% of exam questions are based on NCERT concepts. Our 9 Science Chapter 11. Work and Energy solutions help you understand the core concepts and practice effectively.
Revision is the key to exam success. Our notes for 9 Science highlight important formulas, key definitions, and exam-ready points from Chapter 11. Work and Energy. These quick revision notes make last-minute preparation easy.
Every NCERT chapter ends with exercises, and solving them is crucial. Our Additional -Questions include complete solutions for 9 Science Chapter 11. Work and Energy exercises. With step-by-step answers, you gain clarity and confidence to attempt similar exam questions.
To boost your preparation, we also provide additional important questions with answers. These are prepared from previous year board papers, sample papers, and important concepts of Chapter 11. Work and Energy. Practicing these ensures you are well-prepared for both board and mid-term exams.
Our Additional -Questions are useful for both board exams and mid-term exams. For 9 Science, we provide notes, exercises, and important Q&A so that you can revise smartly and write perfect answers in exams.
In short, Additional -Questions for 9 Science Chapter 11. Work and Energy are a complete study package. With quick revising points, NCERT exercises, and additional important questions, you can prepare effectively for exams. Make these solutions your study companion and excel in your academic journey.
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