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Primary 6 PSLE Science Heat Quiz
Free P6 PSLE Science Heat quiz, HY3 Exam version, with questions, answers, and PSLE-focused practice for Singapore students.
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Answers
Primary 6 PSLE Science Quiz - Heat: Answer Key
Total Marks: 40
Topic: Heat
Section A Answers (1 mark each)
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C) Radiation
Teaching note: Radiation is heat transfer by infrared waves and does not need particles or a medium. Conduction and convection need particles. -
B) Conduction
Teaching note: Heat travels along the metal spoon through particle collisions; this is conduction in solids. -
C) Copper
Teaching note: Metals like copper are good conductors; wood, plastic, cloth are insulators. -
B) From hot to cold
Teaching note: Heat naturally flows from a higher temperature region to a lower temperature region. -
A) Hot water, because particles move faster
Teaching note: Higher temperature means faster particle movement, so diffusion/spreading is quicker. -
B) Warm air rising from a radiator
Teaching note: Convection is movement of fluids due to density changes; warm air rises and cool air sinks. -
B) They expand
Teaching note: Heating gives particles more energy, they move apart, so volume increases (thermal expansion). -
C) Glass
Teaching note: Among the choices, glass is a poor conductor compared to iron, aluminium, silver. -
B) Conduction and convection
Teaching note: Vacuum removes particles, so conduction and convection cannot occur; radiation still possible but walls reflect it. -
B) Water turns to steam and expands
Teaching note: At boiling, liquid water becomes gas (steam), which occupies more space and forms bubbles.
Section B Answers (2 marks each)
-
Wood is a poor conductor of heat (1 mark), so it does not pass heat from the pot to the hand quickly (1 mark).
Common mistake: saying wood "blocks all heat" – it slows transfer, not absolute block. -
Any two correct: (a) radiator / heater (1), (b) boiling pot / convection oven / air conditioner vent (1).
Teaching note: Must be objects where fluid movement carries heat. -
Insulation / double glazing / thick curtains / reduce gaps (2 marks for clear valid method).
Marking: 2 marks if specific and correct; 1 mark if vague like "keep warm". -
Correct (1 mark). Dark surfaces emit and absorb radiation better than shiny ones (1 mark).
Teaching note: Shiny surfaces reflect radiation; dark matte surfaces absorb and emit well. -
Air inside balloon gains heat (1 mark), particles move faster and spread out, expanding balloon (1 mark).
Concept: Thermal expansion of gas. -
Metal base conducts heat to cook food (1 mark); plastic handle is poor conductor so safe to hold (1 mark).
Marking: Must mention both functions.
Section C Answers
(a) Conduction is transfer of heat through a solid by particles vibrating and passing energy (1 mark).
(b) Metals have free electrons / closely packed particles that pass heat quickly (1 mark); wood has trapped air / no free electrons so slow (1 mark).
Total: 3 marks
(a) Convection (1 mark).
(b) Ink rises in centre with warm water (1 mark); heated water expands, becomes less dense and rises, carrying ink (1 mark).
Image note: Expected arrows show centre up, sides down; ink should be shown moving upward.
Total: 3 marks
(a) Copper (1 mark).
(b) Copper is best conductor among the three (1 mark); plastic is insulator so stays cool, iron less conductive than copper (1 mark).
Total: 3 marks
(a) Radiation is heat transfer by electromagnetic waves needing no medium (1 mark).
(b) (i) Shiny surface reflects radiation (1 mark) (ii) Silver colour reduces absorption (1 mark).
(c) Black absorbs radiation best, so heats water efficiently (1 mark).
Total: 4 marks
Quiz total: 10 + 12 + 18 = 40 marks.