Energy Multiple Choice Questions Set 5

How is energy transferred when there is a temperature difference between two objects?

• electrically

• mechanically

• by radiation

• by heating

What is the unit of power?

• kilogram (kg)

• joule (J)

• watt (W)

• metre (m)

What is work done?

• the rate at which energy is transferred

• the transfer of energy from one store to another

• the amount of energy stored in a system

• the time taken for energy to be dissipated

A ball has a mass of 0.06kg. It is thrown 5m upwards into the air. How much gravitational potential energy is stored in the ball at its highest point? Gravitational field strength on Earth = 9.8N/kg.

• 0.30J

• 2.94J

• 32.6J

• 49J

A cheetah with a mass of 50kg runs with a speed of 25m/s. What is the kinetic energy stored in the cheetah?

• 625J

• 1250J

• 15 625J

• 31 250J

Which of the following energy resources does not transfer kinetic energy to generate electricity?

• geothermal

• hydroelectricity

• tides

• wind

What is a disadvantage of oil as an energy resource?

• it is dependent on the weather

• it produces very little electricity

• it is carbon-neutral

• it produces greenhouse gases when burnt

Which of the following is not a method of reducing unwanted energy transfers from a house?

• loft insulation

• gas central heating

• curtains

• reflective foil on inside walls

A lightbulb transfers 26J usefully as light. 174J is dissipated to the surroundings. What is the percentage efficiency of the lightbulb?

• 2.6%

• 13%

• 26%

• 52%

A bungee cord with a spring constant of 15N/m stores 3630J of energy when fully stretched. What is the extension of the bungee cord? Use the equation Ee = 1/2 k e^2.

• 22m

• 0.22m

• 242m

• 16m