Class 9 Practice Level 1 – Work and Energy Leave a Comment / By anushka kumari / July 10, 2024 Class 9 Practice Level 1 – Work and Energy Total questions: 40 1. When is work said to be done? When there is no displacement When there is displacement in the direction of the applied force When there is displacement opposite to the direction of the applied force When there is displacement perpendicular to the applied force None 2. What is the SI unit of energy? Joule Newton Watt Meter None 3. What is power? The rate at which work is done The total amount of work done The force applied on an object The energy stored in an object None 4. Which of the following is the correct formula for work done? Work = Force × Distance Work = Force + Distance Work = Force / Distance Work = Force - Distance None 5. What type of energy is stored in a compressed spring? Kinetic energy Potential energy Thermal energy Electrical energy None 6. Kinetic energy depends on which of the following? Mass and speed of an object Mass and height of an object Speed and height of an object Force and distance None 7. Potential energy is highest in which of the following situations? A ball at the top of a hill A ball rolling down a hill A ball at the bottom of a hill A ball being thrown None 8. What happens to the kinetic energy when the velocity of an object is doubled? It remains the same It is doubled It is quadrupled It is halved None 9. What is the SI unit of power? Joule Newton Watt Kilogram None 10. A man lifts a 20 kg box to a height of 2 meters. How much work is done?$ \displaystyle \left( {Takeg=10m/{{s}^{2}}} \right)$ 20 J 200 J 400 J 40 J None 11. Which form of energy is produced by vibrating objects? Chemical energy Electrical energy Sound energy Thermal energy None 12. What is the power of a machine that does 200 joules of work in 10 seconds? 2 watts 20 watts 2000 watts 200 watts None 13. If the force applied is perpendicular to the direction of motion, what is the work done? Maximum Minimum Zero Infinite None 14. What type of energy does a moving car possess? Potential energy Kinetic energy Chemical energy Thermal energy None 15. What is the potential energy of a 10 kg object raised to a height of 5 meters? $ \displaystyle \left( {Takeg=10m/{{s}^{2}}} \right)$ 50 J 500 J 100 J 1000 J None 16. How much power is required to do 1000 joules of work in 5 seconds? 5 watts 50 watts 200 watts 500 watts None 17. If a person pushes a wall and fails to move it, how much work is done? Zero Maximum Infinite Depends on the force applied None 18. Which type of energy conversion takes place in a battery? Electrical to chemical Chemical to electrical Mechanical to electrical Thermal to electrical None 19. What is the power output of a machine that lifts a 50 kg mass to a height of 10 meters in 5 seconds? $ \displaystyle \left( {Takeg=10m/{{s}^{2}}} \right)$ 50 watts 100 watts 200 watts 1000 watts None 20. What happens to the kinetic energy of an object if its mass is halved and its velocity is doubled? It remains the same It is doubled It is halved It is quadrupled None 21. Which of the following is an example of negative work? Lifting a book Dropping a book Pushing a car forward A car coming to a stop None 22. What is the main form of energy used in a hydroelectric power plant? Chemical energy Nuclear energy Mechanical energy Thermal energy None 23. Which device measures the power of electrical appliances? Thermometer Barometer Voltmeter Wattmeter None 24. How much work is done when a force of 10 N moves an object 3 meters in the direction of the force? 3 J 10 J 30 J 100 J None 25. Which of the following is an example of potential energy? A moving car A stretched rubber band Boiling water Running water None 26. What is the power output if 500 J of work is done in 5 seconds? 5 W 50 W 100 W 200 W None 27. If a force of 15 N is applied at an angle of 60 degrees to the direction of motion and moves an object 5 meters, what is the work done? 15 J 37.5 J 75 J 150 J None 28. What kind of energy transformation occurs when a ball is dropped from a height? Potential to kinetic Kinetic to potential Mechanical to thermal Thermal to electrical None 29. Which of the following units is equivalent to a watt? Joule per second Newton per second Meter per second Kilogram per second None 30. Which of the following scenarios involves no work being done? Pushing a book across a table Lifting a book off the ground Holding a book stationary at a height Dropping a book None 31. What is the energy possessed by a body due to its motion called? Potential energy Kinetic energy Thermal energy Chemical energy None 32. A light bulb consumes 60 J of energy in 1 second. What is its power rating? 30 W 60 W 120 W 600 W None 33. Which of the following factors does not affect the amount of work done? Force applied Distance moved Direction of force Colour of the object None 34. What type of energy is stored in a battery? Kinetic energy Potential energy Chemical energy Thermal energy None 35. How is electrical power calculated? Voltage × Current Voltage + Current Voltage / Current Voltage - Current None 36. If a person lifts a 10 kg object to a height of 2 meters, what is the work done?$ \displaystyle \left( {\text{Take }g=10m/{{s}^{2}}} \right)$ 20 J 100 J 200 J 300 J None 37. Which type of energy is utilized in photosynthesis? Chemical energy Thermal energy Light energy Electrical energy None 38. What is the power of a motor that does 3000 J of work in 10 seconds? 300 W 30 W 3000 W 30,000 W None 39. If a person pulls a suitcase with a force of 20 N over a distance of 10 meters, what is the work done? 2 J 10 J 200 J 100 J None 40. What kind of energy transformation occurs in an electric fan? Electrical to mechanical Mechanical to electrical Chemical to thermal Thermal to electrical None 1 out of 40 Time's up