This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Physics (Part I) Chapter 4 Work – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 4 Work Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What type of energy transformation takes place when you plug in a lamp and turn it on? A) Electrical to radiant. B) Electrical to mechanical. C) Chemical to radiant. D) Mechanical to thermal. Show Answer Correct Answer: A) Electrical to radiant. 2. The law of conservation of energy states that energy A) Can only be converted into heat. B) Cannot be created or destroyed. C) Is created from motion. D) Is always opposite. Show Answer Correct Answer: B) Cannot be created or destroyed. 3. An electric bulb has a power of 100 W. How much energy does it consume in 1 hour? A) 36 kJ. B) 40 kJ. C) 360 kJ. D) 10 kJ. Show Answer Correct Answer: C) 360 kJ. 4. A particle of mass 100g is thrown vertically upwards with a speed of 5 m/s. The work done by the force of gravity during the time the particle goes up is A) 1.25 J. B) 0.5 J. C) -0.5 J. D) -1.25 J. Show Answer Correct Answer: D) -1.25 J. 5. If you push very hard on an object but it does not move, has work been done? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: B) No. 6. Farah has a mass of 47 kg and is moving with initial speed of 5m/s. Find Farah's kinetic energy. A) 1175J. B) 235J. C) 587.5J. D) 2305.35J. Show Answer Correct Answer: C) 587.5J. 7. Two bodies A and B masses m and M(M>>m) have same KE, which body will have more momentum. A) Body A. B) Body B. C) All the above. D) None of the above. Show Answer Correct Answer: B) Body B. 8. A spring with spring constant 200 N/m is compressed by 0.1 m. The potential energy stored in the spring is: A) 1 J. B) 0.5 J. C) 2 J. D) 10 J. Show Answer Correct Answer: B) 0.5 J. 9. Energy transformation for hydropower plant?(HINT:moving water turns turbine that produces electricity.) A) Nuclear $\rightarrow$ electrical. B) Mechanical $\rightarrow$ electrical. C) Chemical $\rightarrow$ electrical. D) Chemical $\rightarrow$ light $\rightarrow$ thermal. Show Answer Correct Answer: B) Mechanical $\rightarrow$ electrical. 10. A stationary particle explodes into two particles of masses m1 and m2 which move in opposite directions with velocities v1 and v2. The ratio of their Kinetic energies E1 / E2 is A) M2 / m1. B) M1 / m2. C) 1. D) M1v2 / m2v1. Show Answer Correct Answer: A) M2 / m1. 11. What is the unit of power in the SI system? A) Newton. B) Pascal. C) Watt. D) Joule. Show Answer Correct Answer: C) Watt. 12. Work energy theorem states that A) Change in kinetic energy equal to work done. B) Average kinetic energy of molecule is equal to absolute temperature. C) Kinetic energy equal to potential energy. D) None of these. Show Answer Correct Answer: A) Change in kinetic energy equal to work done. 13. This is the capability to do work. A) Joules. B) Energy. C) Power. D) Work. Show Answer Correct Answer: B) Energy. 14. A bicyclist comes to skidding in 10m. During this process, the force on the bicycle due to the road is 200N and is directly opposed to the motion. The work done by the cycle on the road is: A) Zero. B) -2000J. C) 1J. D) 2000J. Show Answer Correct Answer: A) Zero. 15. How does friction affect the conservation of energy? A) Friction increases the total energy in a system by creating more work. B) Friction reduces the amount of usable energy in a system by converting it to heat, affecting energy conservation. C) Friction has no impact on energy conservation in closed systems. D) Friction converts energy into potential energy, increasing efficiency. Show Answer Correct Answer: B) Friction reduces the amount of usable energy in a system by converting it to heat, affecting energy conservation. 16. How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200N? A) 4000 joules. B) 10 joules. C) 220 joules. D) 180 joules. Show Answer Correct Answer: A) 4000 joules. 17. The total mechanical energy of an ideal, closed system A) Is constant. B) Decreases over time. C) Is equal to the sum of KE and PE. D) Is constant AND equal to the sum of KE and PE. Show Answer Correct Answer: D) Is constant AND equal to the sum of KE and PE. 18. The energy of movement is ..... ? A) Kinetic. B) Potential. C) All the above. D) None of the above. Show Answer Correct Answer: A) Kinetic. 19. In a block and tackle system the V.R is equal to the number of ..... of the system A) Wheels. B) Strings. C) Revolutions. D) None of the above. Show Answer Correct Answer: B) Strings. 20. Which is NOT a true statement about energy? A) It can change into another form of energy. B) It can cause a temperature change. C) It can cause movement. D) It can be completely used up. Show Answer Correct Answer: D) It can be completely used up. 21. If the K.E. of a body is increased by 300%, its momentum will increase by A) 100%. B) 150%. C) 200%. D) 175%. Show Answer Correct Answer: A) 100%. 22. This is the energy of moving objects using muscles or machines. A) Chemical. B) Nuclear. C) Mechanical. D) Electrical. Show Answer Correct Answer: C) Mechanical. 23. A 0.7 kg coconut falls from a tree. If the gravitational potential energy of the coconut is 18 J, what height is at (in meters)? A) 3.5 m. B) 4 km. C) 2.62 m. D) 1.4 m. Show Answer Correct Answer: C) 2.62 m. 24. What is the significance of the work-energy principle in real-world applications? A) The work-energy principle is essential for predicting and analyzing the effects of forces in various engineering and physical applications. B) It focuses solely on the conservation of energy. C) It explains the relationship between mass and velocity. D) It is only applicable in theoretical physics. Show Answer Correct Answer: A) The work-energy principle is essential for predicting and analyzing the effects of forces in various engineering and physical applications. 25. Energy can't be ..... A) Transformed. B) Created nor destroyed. C) Converted. D) Harnessed or produced. Show Answer Correct Answer: B) Created nor destroyed. 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