2377.
General Science & Ability
What device converts sunlight directly into electricity?
A photovoltaic (solar) cell
View source Verified on 16 September 2026
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2378.
General Science & Ability
Are coal, petroleum and natural gas renewable or non-renewable energy sources?
Non-renewable
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2379.
General Science & Ability
Name three major renewable energy sources.
Solar, wind and hydropower
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2380.
General Science & Ability
What is the greenhouse effect?
The warming that occurs when gases in the atmosphere trap heat radiated from Earth's surface
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2381.
General Science & Ability
What is the difference between weather and climate?
Weather describes short-term atmospheric conditions, while climate describes long-term patterns of weather
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2382.
General Science & Ability
Which gas is the second most abundant in Earth's atmosphere?
Oxygen
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2383.
General Science & Ability
Which gas makes up the largest proportion of Earth's atmosphere?
Nitrogen
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2384.
General Science & Ability
What common compound is chemically known as sodium chloride?
Table salt
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2385.
General Science & Ability
Why is water often called a universal solvent?
Because it dissolves more substances than any other liquid
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2386.
General Science & Ability
What is the chemical formula of water?
H2O
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2387.
General Science & Ability
What is a chemical element?
A substance that cannot be decomposed into simpler substances by ordinary chemical processes
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2388.
General Science & Ability
Which type of lens is thinner at the centre than at the edges?
Concave lens
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