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Primary 6 PSLE Science Heat Quiz
Free P6 PSLE Science Heat quiz, Ox AI version, with questions, answers, and PSLE-focused practice for Singapore students.
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Primary 6 PSLE Science Quiz — Heat: Answer Scheme
Answer 1. (d) Moonlight. Moonlight is reflected sunlight and is not a heat source; the Sun, a burning candle and friction from rubbing hands all produce heat.
Answer 2. (b) Copper is the best conductor of heat among the four materials, so heat travels fastest along it and melts its wax bead first.
Answer 3. (a) The spoon is a solid, so heat passes from the hot bowl to the handle through the spoon itself by conduction.
Answer 4. (c) The track expands on a hot day; the gaps give room for expansion so the rails do not buckle or bend.
Answer 5. (b) Temperature tells us how hot or cold an object is. (Heat actually flows from hotter to colder objects, and heat and temperature are different.)
Answer 6. (c) Radiant heat from the Sun travels through the vacuum of space without needing any medium — this is radiation.
Answer 7. (b) Wood and plastic are poor conductors of heat (insulators), so heat from the pan does not pass quickly to the user's hand.
Answer 8. (c) While melting, the heat gained is used to change ice into water, not to raise the temperature, so the mixture stays at the melting point of 0°C.
Answer 9. (b) Both beakers receive the same amount of heat, but A has less water, so its temperature rises more and ends up higher.
Answer 10. (a) Air cooled at the top becomes denser and sinks, while warmer air rises to take its place. This convection current circulates cold air throughout the whole cabinet.
Answer 11. Metal is a better conductor of heat than wood. It conducts heat away from Ali's hand faster, so his hand loses heat more quickly and the railing feels colder, even though both objects are at the same temperature.
Answer 12.
- (a) A dull black surface is a better absorber of radiant heat than a shiny white surface, so the black can gains heat faster and its water becomes warmer.
- (b) Example: solar water heaters and solar cookers are painted dull black to absorb more heat from the sun.
Answer 13. At 100°C, the boiling point of water, the heat supplied is used to change water into steam instead of raising the temperature, so the temperature remains constant while boiling continues.
Answer 14. The layers trap still air between them. Trapped air is a poor conductor of heat, so less heat escapes from the body and the person stays warmer.
Answer 15. During the day the land heats up faster than the sea. Air above the land is heated, expands, becomes less dense and rises. Cooler, denser air from above the sea moves in to replace it, producing the sea breeze (a convection current).
Answer 16.
- (i) Copper first, then steel, then glass and plastic last. Copper conducts heat fastest; glass and plastic are poor conductors, so their exact order may vary.
- (ii) Any one: same length and thickness of rods; same amount of wax on each rod; beads at the same distance from the heated end; same temperature and volume of hot water.
Answer 17.
- (a) The vacuum contains no matter, so heat cannot pass across it by conduction or convection, as both need a medium.
- (b) The shiny silver surfaces reflect radiant heat back towards the drink, reducing heat loss by radiation.
Answer 18.
- (a) Concrete expands when hot and contracts when cool. The gaps give the slabs room to expand; without gaps, the slabs would push against each other and crack or buckle.
- (b) Soft tar is compressed when the slabs expand, so it fills the gap while still allowing the slabs to move.
Answer 19.
- (i) The colour of the cloth covering the flasks (black versus white).
- (ii) Any two: volume of water in each flask; starting temperature of the water; type and thickness of cloth; size and material of the flasks; same location and duration in the sun.
- (iii) The temperature of the water in each flask, recorded every 10 minutes (or after a fixed time).
Answer 20.
- (i) Melting — the ice (solid) is changing into water (liquid) at its melting point of 0°C.
- (ii) Between the end of the flat part at 0°C and the start of the flat part at 100°C, only liquid water is present.
- (iii) The heat supplied is used to change water into steam, not to raise the temperature, so the temperature stays at the boiling point of 100°C.