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Primary 5 Science Heat Quiz
Free P5 Science Heat quiz, Ox Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Questions
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Answers
Primary 5 Science Quiz - Heat: Answer Key
Answer 1.
(2) A burning candle
Answer 2.
(2) The temperature of the water
Answer 3.
(2) Heat flows from the tea to the spoon until both reach the same temperature.
Answer 4.
(1) Copper
Answer 5.
(4) Wood
Answer 6.
Metal is a good conductor of heat. Heat flows from the hot soup through the spoon by conduction, particle to particle, until the far end of the handle also becomes hot.
Answer 7.
- Liquid to Solid: freezing; heat lost
- Liquid to Gas: boiling (or evaporation); heat gained
- Gas to Liquid: condensation; heat lost
Answer 8.
(a) The wrapping of the cup (woollen sock versus no wrapping). (b) Any one: same volume/amount of water; same starting temperature (80 °C); identical cups; readings every 5 minutes. (c) Cup A stayed hotter because wool is a poor conductor of heat (an insulator), so less heat escaped to the surroundings.
Answer 9.
(a) The temperature rose steadily as the water was heated. (b) 20 °C (from 30 °C to 50 °C). (c) Bunsen burner / hot plate / candle flame (any sensible source).
Answer 10.
Steel expands when it gains heat on a hot day. Without gaps, the expanding track sections would push against each other and bend or buckle. The gaps give space for expansion.
Answer 11.
Any two:
- The vacuum between the double walls prevents heat loss by conduction and convection.
- The shiny silvered surfaces reflect heat back, reducing heat loss by radiation.
- The tight stopper reduces heat loss by convection and evaporation at the top.
Answer 12.
The dull black can cooled faster. Dull black surfaces give out (radiate) heat faster than shiny silver surfaces.
Answer 13.
(a) From Mei Ling's warmer hand to the colder ice cube. (b) The ice cube gained heat and melted from a solid to a liquid. (c) Her hand lost heat to the ice cube, so it felt cold.
Answer 14.
Metal is a better conductor of heat than wood. It conducts heat away from the skin faster, so the metal chair feels colder even though both are at room temperature.
Answer 15.
The metal body conducts heat quickly and spreads it evenly to cook the food. The wooden handle is a poor conductor of heat, so it stays cool enough to hold safely.
Answer 16.
When the bulb touches a hot object, the liquid inside gains heat and expands. It rises up the narrow tube. The level stops rising when the liquid reaches the temperature of the object, and the scale gives the reading.
Answer 17.
(a) The copper rod. (b) Different materials conduct heat at different rates; copper conducted heat best among those tested. (c) The wax gained heat conducted along the rod, melted, and let go of the ball bearing.
Answer 18.
Dark-coloured surfaces absorb heat radiation better than light-coloured ones, so dark clothes take in more heat from sunlight and help keep the wearer warm.
Answer 19.
Brass expands more than iron when heated. The strip bends towards the iron side (the side that expands less).
Answer 20.
(a) From the sun (and the warm surrounding air). (b) Melting: the ice cream changed from a solid to a liquid and gained heat. (c) Its temperature would continue to rise until it reached the temperature of the surroundings.