Olibits / Science / Energy Enrichment
Primary 6 Science: Energy Enrichment Practice
Real Primary 6 Science questions on Energy Enrichment, pulled directly from the Olibits question bank — the same questions a child would actually see, not separately written for this page.
MOE strand: Discovery Science
Curriculum alignment
Science Teaching & Learning Syllabus, Primary Three to Six (MOE, 2023 syllabus)
Science is not a taught subject at P1/P2 under MOE's own syllabus — our P1/P2 Science content is offered as enrichment beyond the official syllabus, not as a claim of syllabus coverage at those grades.
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Real Energy Enrichment practice questions
A birthday candle is lit on a cake, and it flickers with a small flame, releasing warmth into the air. What energy conversion is taking place in the burning candle?
Kinetic energy is converted into sound energy
Electrical energy is converted into chemical energy
Chemical energy is converted into light energy and heat energy ✓
Light energy is converted into chemical energy
The wax and wick of the candle store chemical energy, which is converted into light energy (the flame) and heat energy (the warmth) as it burns.
Why is solar energy classified as a renewable energy source, unlike coal or oil?
Sunlight is continuously available and will not run out on a human timescale, unlike fossil fuels which take millions of years to form ✓
Solar energy does not involve any energy conversion when generating electricity
Solar energy can only be used once and must then be replaced
Sunlight is produced artificially inside power stations
Renewable energy sources such as sunlight are naturally and continuously replenished, so they will not be used up even with ongoing use, unlike non-renewable fossil fuels.
In a coal-fired power station, coal is burnt to heat water into steam, which spins a turbine connected to a generator. What is the correct order of energy conversion?
Heat energy → chemical energy → electrical energy → kinetic energy
Electrical energy → chemical energy → heat energy → kinetic energy
Kinetic energy → chemical energy → heat energy → electrical energy
Chemical energy → heat energy → kinetic energy → electrical energy ✓
Coal stores chemical energy, which is released as heat when burnt. This heat turns water into steam, whose kinetic energy spins the turbine, and the generator finally converts this into electrical energy.
Nuclear power stations use uranium as fuel to generate electricity. Why is nuclear energy generally classified as non-renewable, even though it does not come from fossilised remains like coal or oil?
Uranium is manufactured artificially in factories and never runs out
Nuclear power stations do not produce any usable electrical energy
Uranium is a limited resource mined from the Earth's crust and cannot be replenished within a human lifetime once used up ✓
Nuclear reactions do not involve any energy conversion at all
Like fossil fuels, uranium exists in limited quantities within the Earth's crust, so once it is used up it cannot be replaced within a human lifetime, making nuclear energy non-renewable even though it is not a fossil fuel.