Chapter 7, Energy — How Things Work, looks at renewable and non-renewable sources of energy and how energy changes form to power the things we use every day. These questions revisit those ideas.
Practice Questions
Q1. Name two sources of renewable energy.
Sunlight (solar energy) and wind are two common renewable energy sources.
Q2. Name one source of non-renewable energy.
Coal is a non-renewable energy source (petroleum and natural gas are others).
Q3. Why is renewable energy considered better for the environment than non-renewable energy?
Renewable sources like sun and wind don’t run out and cause far less pollution, while non-renewable sources like coal are limited and pollute more when burned.
Q4. Give one example of energy changing from one form to another in daily life.
An electric fan changes electrical energy into motion (kinetic) energy; a solar cooker changes light energy into heat energy.
Q5. Name one simple way to save electrical energy at home.
Switching off lights and fans when leaving a room saves electrical energy.
Why These Help
Recognising which energy sources are renewable and which are limited helps build habits of careful energy use, which matters both for household electricity bills and for the wider environment.
Frequently Asked Questions
Q. Why do we need to conserve energy if some sources like sunlight never run out?
Harnessing, storing and distributing even renewable energy takes resources and infrastructure, so using energy wisely still reduces waste and cost for everyone.
See the Chapter 7 Solutions and Revision Notes for the full walkthrough.
