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Work power energy and eficiency

Quiz by Rashid Ibrahim

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20 questions
Show answers
  • Q1
    What is the power output of a machine that does 1000 joules of work in 5 seconds?
    200 \text{ W}
    150 \text{ W}
    300 \text{ W}
    250 \text{ W}
    30s
  • Q2
    A 50 kg mass is lifted to a height of 10 meters. What is the potential energy of the mass at this height? (g = 9.8 m/s^2)
    5000 \text{ J}
    4900 \text{ J}
    4500 \text{ J}
    4800 \text{ J}
    30s
  • Q3
    Which of the following statements correctly describes energy efficiency?
    Energy efficiency is how fast a system can perform work.
    Energy efficiency is the total amount of energy produced by a system.
    Energy efficiency measures how much useful work is extracted from a system compared to the total energy input.
    Energy efficiency is the amount of energy required to run a system.
    30s
  • Q4
    A 500 W electric motor lifts a weight of 200 kg to a height of 5 meters in 10 seconds. What is the efficiency of the motor? (Take g = 9.8 m/s^2)
    40%
    50%
    60%
    30%
    30s
  • Q5
    Which of the following statements accurately describes the relationship between work, power, and energy?
    Work, power, and energy are the same concepts and can be used interchangeably.
    Power is the amount of work done, and energy is the force applied to an object.
    Work is the transfer of energy to or from an object by applying a force over a distance; power is the rate at which work is done; and energy is the ability to do work.
    Work is the speed at which an object moves, power is the effort exerted, and energy is the result of work done.
    30s
  • Q6
    A student pushes a box with a force of 50 N over a distance of 10 meters. How much work is done in pushing the box?
    550 \text{ J}
    450 \text{ J}
    500 \text{ J}
    600 \text{ J}
    30s
  • Q7
    If a car engine has an efficiency of 25% and produces 1000 J of useful work, how much energy was initially input into the system?
    250 \text{ J}
    1250 \text{ J}
    2000 \text{ J}
    4000 \text{ J}
    30s
  • Q8
    What is the unit commonly used to measure power?
    Joule
    Watt
    Newton
    Volt
    30s
  • Q9
    A machine exerts a force of 100 N to pull a crate a distance of 20 meters. How much work is done by the machine?
    1800 \text{ J}
    2000 \text{ J}
    2200 \text{ J}
    2500 \text{ J}
    30s
  • Q10
    If an electric kettle uses 1500 W of power and takes 4 minutes to boil water, how much energy is used?
    360000 \text{ J}
    90000 \text{ J}
    6000 \text{ J}
    540000 \text{ J}
    30s
  • Q11
    Which of the following formulas correctly represents the relationship between work (W), force (F), and distance (d)?
    W = F + d
    W = F/d
    W = Fd
    W = d/F
    30s
  • Q12
    Which of the following units is used to measure power?
    Ohm
    Volt
    Watt
    Ampere
    30s
  • Q13
    What is the formula for calculating mechanical efficiency?
    Efficiency = Useful work output - Total work input
    Efficiency = Useful work output x Total work input
    Efficiency = (Useful work output / Total work input) x 100%
    Efficiency = (Total work input / Useful work output) x 100%
    30s
  • Q14
    If a 100 watt light bulb runs for 2 hours, how much energy does it consume?
    150 watt-hours
    300 watt-hours
    200 watt-hours
    50 watt-hours
    30s
  • Q15
    Which of the following statements correctly describes work in physics?
    Work is done when a force is applied to an object and the object moves in the direction of the force.
    Work is done only when an object moves against the direction of the force.
    Work is done when an object is at rest and a force is applied to it.
    Work is done whenever a force is applied to an object.
    30s

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