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Course: Science — Third Preparatory
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Science — Third Preparatory

Science — Third Preparatory

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Science — Third Preparatory 2026/2027

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Unit 1 - Force, Motion, Acceleration and Physical Quantities

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Quiz

Question bank: Unit 1 — Chemical Reactions and Their Environmental Impacts

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  • Questions count: 4
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1.
A yellow, smoky flame on a gas burner shows:
complete combustion
incomplete combustion
no combustion
a decomposition reaction
2.
The complete combustion of methane gives:
CO and H₂O
C and H₂O
CO₂ and H₂O
CO₂ and H₂
3.
How many oxygen molecules are needed to burn 3 methane molecules completely?
3
6
9
12
4.
Carbon monoxide in smoke is dangerous because it:
dissolves tar
combines with haemoglobin and reduces the oxygen carried by blood
is a heavy gas that sinks
turns limewater milky
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