Chapter 1&2: Energy Quiz

What is energy?

• Something that can be created or destroyed

• Something that can be transferred, dissipated or stored

• Something that can only be transferred

• Something that can only be stored

Can energy be created or destroyed?

• Yes, it can be created or destroyed

• No, it can only be transferred

• No, it can only be stored

• No, it can be transferred, dissipated or stored

What is the main energy transfer for an apple falling from a tree?

• Kinetic energy → elastic potential energy

• Chemical energy → gravitational potential energy

• Gravitational potential energy → kinetic energy

When Alexander, Benjamin, and Noah are playing with a ball and it bounces off the ground, what happens to the energy during the bounce?

• It is created

• It is destroyed

• It is transferred

• It is stored

What happens whenever energy is transferred between stores?

• All the energy is transferred to other useful stores

• Some of the original energy is dissipated

• All of the energy is dissipated to the surroundings

How much work is done by a 10 N force pushing a box 4 m across the floor?

• 40 J

• 14 J

• 2.5 J

Which of the following is a definition of power?

• The amount of work done by a certain force

• The energy transferred × time taken

• The amount of work done ÷ time taken

What is the percentage efficiency of Christmas lights that give out 10 W of light radiation for an electrical power input of 200 W?

• 20 %

• 10 %

• 5 %

In an electric kettle, what energy is not wasted?

• The energy that heats the water

• The energy that dissipates out of the kettle into the surroundings

• The sound heard as the kettle boils

How much energy will it take to raise 3 kg of water by 5˚C? (water has a specific heat capacity of 4,200 J/kg˚C)

• 63,000 J

• 4,200 J

• 21,000 J