GCSE Energy Quiz

What is the principle of conservation of energy?

• Energy can be created but not destroyed

• Energy can neither be created nor destroyed, only transformed from one form to another

• Energy can be destroyed but not created

• Energy can be transformed into matter

Which of the following is an example of energy transfer from chemical to kinetic?

• A battery lighting a bulb

• Eating food and running

• Solar panels generating electricity

• Burning coal to heat water

What is the efficiency of a machine that inputs 100J of energy and outputs 75J of useful work?

• 0.75%

• 7.5%

• 75%

• 750%

In a closed system, if the total initial energy is 500J, what is the total final energy?

• 0J

• 250J

• 500J

• 1000J

Which of the following is NOT a form of energy?

• Thermal

• Chemical

• Elastic

• Plastic

What happens to the energy that is not transferred as useful energy in a machine?

• It disappears

• It is stored for later use

• It is transferred as waste energy, often as heat

• It is converted into matter

If a light bulb has an efficiency of 20% and uses 100J of electrical energy, how much light energy does it produce?

• 20J

• 50J

• 80J

• 100J

In a pendulum, where is the potential energy highest?

• At the lowest point of its swing

• At the highest point of its swing

• In the middle of its swing

• Potential energy remains constant throughout the swing

A 2.5kW electric radiator is used for 2 hours. Calculate the energy transferred.

Use the equation: energy transferred = power × time

• 1.25kWh

• 5kWh

• 1250kWh

• 5000kWh

Why are step-up transformers used in the national grid?

• To generate alternating currents.

• To increase the current from power stations.

• To increase the voltage from power stations.

• To reduce pollution from power stations