Energy Multiple Choice Questions Set 2

What name is given to the energy stored in a moving object?

• chemical potential energy

• elastic potential energy

• gravitational potential energy

• kinetic energy

What is the unit of energy?

• kilogram (kg)

• joule (J)

• watt (W)

• metre (m)

Which word describes energy that is ‘wasted’ from a system?

• destroyed

• diffused

• dissipated

• dissociated

A person with a mass of 35kg sits at the top of a slide 2m above the ground. What is the gravitational potential energy stored in the person? Gravitational field strength on Earth = 9.8N/kg.

• 70J

• 140J

• 171.5J

• 686J

An elastic band with a spring constant of 25N/m is stretched from 3cm to 15cm. How much elastic potential energy is stored in the elastic band? Use the equation E_e = 1/2 k e².

• 0.15J

• 0.18J

• 1500J

• 1800J

Which of the following energy resources is non-renewable?

• geothermal

• hydroelectricity

• natural gas

• wind

What is a non-renewable energy resource?

• a resource that is very unreliable

• a resource that produces a lot of polluting gases

• a resource that cannot be replenished and will eventually run out

• a resource that can be reused or replaced

What name is given to a material that allows energy to be transmitted through it easily?

• conductor

• insulator

• resistor

• lubricant

The total power supplied to a hairdryer is 1500W. The useful power output is 1260W. What is the percentage efficiency of the hairdryer?

• 0.84%

• 1.6%

• 16%

• 84%

A kettle has a power of 2300W. It takes 86 seconds for the kettle to boil. How much energy is transferred to the thermal energy store of the water?

• 26.7J

• 3296J

• 197 800J

• 37.4kJ