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Work Energy and Power

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Q. A car does 1200 J of work in moving a distance of 30 m. What is the force applied?
  • A. 20 N
  • B. 30 N
  • C. 40 N
  • D. 50 N
Q. A cyclist travels 60 km in 2 hours. What is his average speed?
  • A. 20 km/h
  • B. 25 km/h
  • C. 30 km/h
  • D. 35 km/h
Q. A machine does 2400 J of work in 8 seconds. What is its power in watts?
  • A. 200 W
  • B. 250 W
  • C. 300 W
  • D. 350 W
Q. A person can do a piece of work in 12 days. How much work can he do in 3 days?
  • A. 1/4 of the work
  • B. 1/3 of the work
  • C. 1/2 of the work
  • D. 2/3 of the work
Q. A pump can fill a tank in 4 hours. How long will it take to fill the tank if two pumps are used?
  • A. 1 hour
  • B. 2 hours
  • C. 3 hours
  • D. 4 hours
Q. A worker can complete a job in 8 hours. If he works for 3 hours, what fraction of the job is completed?
  • A. 1/8
  • B. 1/4
  • C. 3/8
  • D. 1/2
Q. If a machine can complete a work in 10 hours, how much work can it do in 5 hours?
  • A. 50 units
  • B. 100 units
  • C. 200 units
  • D. 250 units
Q. If a machine does 500 J of work in 5 seconds, what is its power output?
  • A. 50 W
  • B. 100 W
  • C. 150 W
  • D. 200 W
Q. If a worker can do 1/3 of a job in 2 hours, how long will it take him to complete the entire job?
  • A. 4 hours
  • B. 5 hours
  • C. 6 hours
  • D. 8 hours
Q. Two workers can complete a task in 15 days. How long will it take for 3 workers to complete the same task?
  • A. 10 days
  • B. 12 days
  • C. 15 days
  • D. 20 days
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