Free practice on Machines for Class 4, following the Cameroon primary school curriculum (English subsystem). Every answer is explained, so a parent who is not sure of the answer can still help.
A hand-turned grinding stone and an electric grinding machine do the same job, but they differ in the source of power that drives them — one uses human effort, the other electricity.
Manual — powered by human effort vs Electrical — powered by electricity
Machines found in the locality, like grinding mills, mainly help people do work faster and with less effort than doing it all by hand.
⚙️ A machine at work
A grinding machine used to crush corn is an example of a:
Answer: D. manual or electrical machine that makes work easier
A hand-turned grinding stone and an electric grinding machine both do the same job, but differ mainly in:
Answer: A. the source of power that drives them
Which of these is powered by electricity rather than by hand?
Answer: B. An electric weaving machine
Machines found in the locality, like grinding mills, mainly help people to:
Answer: C. do work faster and with less effort
A manually operated machine is powered mainly by:
Answer: D. human effort
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