Work and Energy (कार्य तथा ऊर्जा) Ch(10) Practice Quiz in Hindi Part – 2 || Class 9 Science Practice Quizzes in English Posted on February 28, 2025February 28, 2025 by Anshul Gupta0% 0 votes, 0 avg 0 Work and Energy (कार्य तथा ऊर्जा) Ch(10)Practice Quiz in Hindi Part – 2 || Class 9 Science Practice Quizzes in English 1 / 201. What kind of energy conversion occurs when a ball falls freely? A. Kinetic energy to potential energy B. Chemical energy to light energy C. Light energy to chemical energy D. Potential energy to kinetic energy Explanation: During free fall, the ball’s potential energy is converted into kinetic energy. 2 / 202. What happens to the kinetic energy of a freely falling object when it hits the ground? A. It is stored as potential energy B. It disappears C. It is converted into other forms of energy, such as heat and sound D. None of the above Explanation: The kinetic energy is not lost but is transformed into other forms, primarily heat and sound. 3 / 203. What is the energy transformation that occurs when a spring is released? A. Chemical energy to potential energy B. Potential energy to kinetic energy C. Heat energy to potential energy D. Kinetic energy to potential energy Explanation: The stored potential energy in the compressed spring is converted into kinetic energy as it expands.4 / 204. What is the energy transformation that occurs in a thermal power plant? A. Heat energy to electrical energy B. Potential energy to kinetic energy to electrical energy C. Chemical energy to heat energy to electrical energy D. Nuclear energy to electrical energy Explanation: Chemical energy in fuel is converted to heat energy, which boils water to produce steam that drives turbines, generating electricity.5 / 205. What is the work done by a person holding a heavy load over their head for an extended period? A. Cannot be determined B. Zero C. Positive D. Negative Explanation: Even though the person expends energy, no work is done on the load if it doesn’t move. 6 / 206. What happens to the energy of a pendulum eventually? A. It disappears B. None of the above C. It is stored as potential energy D. It is converted into other forms of energy, such as heat and sound due to friction Explanation: The energy of the pendulum is gradually lost to overcome friction, converting it into heat and sound. 7 / 207. What is the work done when a force acts opposite to the direction of displacement? A. Zero B. Negative C. Positive D. Cannot be determined Explanation: When force and displacement are in opposite directions, the work done is considered negative. 8 / 208. What is the energy transformation that occurs in a hydroelectric power plant? A. Heat energy to electrical energy B. Potential energy to kinetic energy to electrical energy C. Chemical energy to electrical energy D. Nuclear energy to electrical energy Explanation: Water stored at a height has potential energy, which is converted to kinetic energy as it falls and then to electrical energy by the generator.9 / 209. What is the energy transformation that occurs when a spring is compressed? A. Kinetic energy to potential energy B. Potential energy to kinetic energy C. Heat energy to potential energy D. Chemical energy to potential energy Explanation: The work done to compress the spring is stored as potential energy in the spring.10 / 2010. What is the energy conversion that occurs in a battery-powered flashlight? A. Nuclear energy to light energy B. Heat energy to light energy C. Potential energy to light energy D. Chemical energy to light energy Explanation: Batteries store chemical energy, which is converted into light energy by the flashlight bulb. 11 / 2011. What is the work done by the force of gravity on a satellite moving in a circular orbit around the Earth? A. Zero B. Cannot be determined C. Positive D. Negative Explanation: The force of gravity is always perpendicular to the displacement of the satellite in a circular orbit, so no work is done. 12 / 2012. What is the energy transformation that occurs when a pendulum swings? A. Heat energy to kinetic energy B. Kinetic energy to potential energy and vice versa C. Nuclear energy to kinetic energy D. Chemical energy to kinetic energy Explanation: As the pendulum swings, it continuously converts potential energy to kinetic energy and back. 13 / 2013. What is the work done on an object moving with uniform velocity in a circular path? A. Cannot be determined B. Zero C. Negative D. Positive Explanation: In uniform circular motion, the force is always perpendicular to the displacement, so no work is done.14 / 2014. What is the energy transformation that occurs in a wind turbine? A. Kinetic energy to electrical energy B. Nuclear energy to electrical energy C. Chemical energy to electrical energy D. Heat energy to electrical energy Explanation: Wind turbines convert the kinetic energy of wind into electrical energy.15 / 2015. What is the energy transformation that occurs in a solar cell? A. Light energy to electrical energy B. Nuclear energy to electrical energy C. Kinetic energy to electrical energy D. Heat energy to electrical energy Explanation: Solar cells directly convert light energy into electrical energy.16 / 2016. What is the work done by the force of friction? A. Positive B. Zero C. Negative D. Cannot be determined Explanation: The force of friction always acts opposite to the direction of motion, so it does negative work.17 / 2017. What is the work done when a force acts in the same direction as the displacement? A. Cannot be determined B. Negative C. Zero D. Positive Explanation: Work done is considered positive when the force and displacement are in the same direction. 18 / 2018. What is the energy conversion that occurs when a person lifts a book? A. Heat energy to potential energy B. Chemical energy to potential energy C. Nuclear energy to potential energy D. Potential energy to kinetic energy Explanation: The person uses chemical energy from food, which is converted into potential energy stored in the lifted book.19 / 2019. What is the energy transformation that occurs in a nuclear power plant? A. Nuclear energy to heat energy to electrical energy B. Potential energy to kinetic energy to electrical energy C. Heat energy to electrical energy D. Chemical energy to electrical energy Explanation: Nuclear reactions release heat energy, which boils water to produce steam that drives turbines, generating electricity.20 / 2020. What is the energy required to do 1 joule of work? A. 1 meter B. 1 newton C. 1 watt D. 1 joule Explanation: Energy and work have the same units, so 1 joule of work requires 1 joule of energy. 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