Olibits / Science / Energy Conversion & Sources
Primary 6 Science: Energy Conversion & Sources Practice
Real Primary 6 Science questions on Energy Conversion & Sources, pulled directly from the Olibits question bank — the same questions a child would actually see, not separately written for this page.
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 Conversion & Sources practice questions
What does the law of conservation of energy state?
New energy is created whenever a machine is switched on
Energy is slowly destroyed each time it is used
Energy cannot be created or destroyed, only converted from one form to another ✓
Only renewable energy sources can be converted between forms
This important law tells us that the total amount of energy in a system stays the same; energy simply changes from one form into another, such as chemical energy becoming heat and kinetic energy.
A moving car eventually slows down and stops due to friction, even though no brakes are applied. What happens to its kinetic energy, according to the law of conservation of energy?
It stays as kinetic energy but becomes impossible to detect
It is converted back into fuel inside the engine
It is converted mainly into heat energy (and some sound energy) due to friction, not destroyed ✓
It is completely destroyed and disappears from the system
Even though the car appears to lose energy, its kinetic energy is not destroyed. Friction between the tyres, air and road converts it mainly into heat energy, in line with the law of conservation of energy.
What is a key disadvantage of relying only on solar panels to generate electricity?
Solar panels use up a non-renewable resource very quickly
Solar panels cause more air pollution than burning coal
Solar panels cannot convert light energy into electrical energy at all
Solar panels cannot generate electricity effectively at night or on very cloudy days ✓
Solar energy generation depends on sunlight, so its output is reduced or stops when it is dark or heavily overcast, making it less reliable as a sole energy source without storage.
In a hydroelectric dam, falling water turns a turbine connected to a generator. What is the main energy conversion?
The heat energy of water is converted into sound energy
The nuclear energy of water is converted into electrical energy
The chemical energy of water is converted into light energy
The kinetic energy of falling water is converted into electrical energy ✓
Water stored at a height has gravitational potential energy, which becomes kinetic energy as it falls and spins the turbine; the turbine's generator then converts this into electrical energy.