Work and Energy (कार्य तथा ऊर्जा) Ch(10) Practice Quiz in Hindi Part – 1 || Class 9 Science Practice Quizzes in English Posted on February 28, 2025February 28, 2025 by Anshul Gupta0% 0 votes, 0 avg 4 Work and Energy (कार्य तथा ऊर्जा) Ch(10)Practice Quiz in Hindi Part – 1 || Class 9 Science Practice Quizzes in English 1 / 201. What is the sum of potential energy and kinetic energy of an object called? A. None of the above B. Total energy C. Internal energy D. Mechanical energy Explanation: Mechanical energy is the sum of an object’s potential and kinetic energies. 2 / 202. What kind of energy conversion occurs in photosynthesis? A. Kinetic energy to potential energy B. Potential energy to kinetic energy C. Light energy to chemical energy D. Chemical energy to light energy Explanation: Photosynthesis converts light energy from the sun into chemical energy stored in glucose.3 / 203. What is the work done if a person applies a force of 20 N to a wall but the wall doesn’t move? A. 20 J B. Cannot be determined C. 0 J D. 40 J Explanation: If there is no displacement, there is no work done, even if a force is applied. 4 / 204. What kind of energy is stored in a stretched rubber band? A. Heat energy B. Potential energy C. Chemical energy D. Kinetic energy Explanation: A stretched rubber band stores potential energy due to its change in configuration. 5 / 205. What is the work done if a force of 10 N causes a displacement of 5 meters? A. 25 J B. 10 J C. 5 J D. 50 J Explanation: Work done W) = Force F) x Displacement s) = 10 N x 5 m = 50 J. 6 / 206. What is the condition for work to be done? A. Both a) and b) B. Force on an object C. Neither a) nor b) D. Displacement of the object Explanation: Work is done only when a force is applied to an object, and that object moves a certain distance. 7 / 207. What is the formula for kinetic energy? A. KE = mgh B. KE = Fs C. KE = P/t D. KE = 1/2 mv^2 Explanation: Kinetic energy is calculated as half the mass times the square of the velocity. 8 / 208. What is the rate of doing work called? A. Force B. Velocity C. Power D. Energy Explanation: Power is the amount of work done per unit of time. 9 / 209. What kind of energy conversion occurs when a ball is thrown upwards? A. Chemical energy to light energy B. Potential energy to kinetic energy C. Light energy to chemical energy D. Kinetic energy to potential energy Explanation: As the ball moves upward, its kinetic energy is converted into potential energy.10 / 2010. What is the unit of work? A. Joule B. Meter C. Watt D. Newton Explanation: Work is defined as the force applied over a distance, and its unit is the joule J). 11 / 2011. What is the energy possessed by an object in motion called? A. Potential energy B. Kinetic energy C. Mechanical energy D. Chemical energy Explanation: Kinetic energy is the energy an object has due to its motion. 12 / 2012. What is the unit of power? A. Joule B. Watt C. Newton D. Meter Explanation: Power is measured in watts W). 13 / 2013. What is the scientific definition of work? A. Energy possessed by an object B. Rate of energy transfer C. Force applied over a distance D. Any physical or mental labor Explanation: In science, work is done when a force causes an object to move a certain distance. 14 / 2014. What is the biggest natural source of energy for us? A. The Wind B. The Sun C. The Moon D. The Earth Explanation: The Sun is the primary source of energy for most processes on Earth. 15 / 2015. What is 1 watt equal to? A. 1 meter per second B. 1 joule per second C. 1 newton per meter D. 1 kilogram per second Explanation: 1 watt is defined as the power when 1 joule of work is done in 1 second. 16 / 2016. What kind of energy does a rolling stone have? A. Chemical energy B. Heat energy C. Kinetic energy D. Potential energy Explanation: A rolling stone has kinetic energy due to its motion. 17 / 2017. What is the law of conservation of energy? A. Energy cannot be created or destroyed, only transformed B. None of the above C. Energy can be created D. Energy can be destroyed Explanation: The law of conservation of energy states that energy can change forms but cannot be created or destroyed. 18 / 2018. What kind of energy does a book on a shelf have? A. Heat energy B. Chemical energy C. Potential energy D. Kinetic energy Explanation: The book has gravitational potential energy due to its position above the ground. 19 / 2019. What is the formula for potential energy? A. PE = P/t B. PE = Fs C. PE = mgh D. PE = 1/2 mv^2 Explanation: Potential energy due to gravity is calculated as mass times gravity times height. 20 / 2020. What is the energy possessed by an object due to its position or configuration called? A. Chemical energy B. Mechanical energy C. Kinetic energy D. Potential energy Explanation: Potential energy is stored energy that an object has due to its position or state. 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