Effects of heat gain and loss — expansion, contraction and change of state
P4 Science · Energy Forms and Uses (Heat) · 203 questions · difficulty D1–D5 · Singapore MOE-aligned
Sample questions
SAMPLE 1
A metal lid on a glass jar is stuck because it is too tight. To loosen it, you run hot water over the lid. What happens to the metal lid as it gains heat?
A It expands
B It contracts
C It melts
D It stays the same size
SAMPLE 2
A metal lid on a glass jar is stuck because it is too tight. When you run hot water over the metal lid, it expands more than the glass and becomes easier to open. Which property of the metal lid changes the most when heated?
A It expands
B It melts
C It contracts
D It changes colour
SAMPLE 3
At a school sports day, a metal measuring tape is left lying on the field in the hot sun for an hour. Its length increases by 2 mm. If the same tape were placed in an ice bath, what would most likely happen to its length?
A decrease by about 2 mm
B increase by about 2 mm
C remain the same
D decrease by about 4 mm
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