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Primary 6 PSLE Science Heat Quiz
Free P6 PSLE Science Heat quiz, Ox Exam version, with questions, answers, and PSLE-focused practice for Singapore students.
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Primary 6 PSLE Science Quiz - Heat — Answer Key
Topic: Heat (Energy) | Assessment: sa2 - Version 1 of 5 | Total Marks: 52
Answer 1.
(A) conduction — heat travels through the metal spoon by direct particle-to-particle transfer. [2 marks]
Answer 2.
(B) Q contains more heat than P — both are at the same temperature, but Q has more water (greater mass), so it holds more heat energy. [2 marks]
Answer 3.
(A) copper [2 marks]
Answer 4.
(A) is a better conductor of heat than plastic — metal conducts heat from the warm room to the ice faster, so the ice gains heat and melts sooner. [2 marks]
Answer 5.
(A) the land heats up faster, so warm air above it rises and cooler sea air moves in to replace it [2 marks]
Answer 6.
Heat is a form of energy that flows from a hotter object to a cooler object. Temperature measures how hot or cold an object is (in °C). [2 marks]
Answer 7.
Plastic and wood are poor conductors of heat (insulators), so heat from the hot pot does not travel quickly to the user's hand. [2 marks]
Answer 8.
Railway tracks expand when heated on hot days. The gaps give room for expansion so the tracks do not bend or buckle. [2 marks]
Answer 9.
Heating causes the metal ball to expand, so it becomes slightly larger in size and can no longer pass through the ring. [2 marks]
Answer 10.
Convection. [2 marks]
Answer 11.
Dark-coloured surfaces are better absorbers of heat radiation, so dark clothing absorbs more heat from the sun and surroundings, keeping the wearer warmer. [2 marks]
Answer 12.
A vacuum contains no matter, so heat cannot be transferred through it by conduction or convection. This greatly reduces heat loss from the hot drink. [2 marks]
Answer 13.
Brass expands more than iron when heated. The brass side becomes longer than the iron side, so the strip bends (curls) towards the iron side. [2 marks]
Answer 14.
No. Temperature only shows how hot something is; the amount of heat also depends on mass. The spark has very little matter, so the bathtub of water at 40 °C actually contains far more heat. [2 marks]
Answer 15.
The wax on the copper rod melts first. Copper is the best conductor of the three, so it conducts heat along the rod fastest to melt its wax blob. [2 marks]
Answer 16.
- (a) Glass is a poor conductor of heat. The inside surface of the thick glass heats up and expands quickly, while the outside remains cool and unexpanded. This uneven expansion cracks the glass. [2 marks]
- (b) Use a thinner tumbler or heat-resistant (borosilicate) glass, or warm the glass gradually before pouring. [2 marks]
Answer 17.
- (a) The vacuum stops heat loss by conduction and convection because both need a material medium. [1 mark]
- (b) The shiny silver surfaces reflect heat radiation back into the flask, reducing heat loss by radiation. [1 mark]
- (c) The stopper stops warm air/water vapour from escaping, preventing heat loss by convection and evaporation. [2 marks]
Answer 18.
- (i) The land cools down faster than the sea at night. [2 marks]
- (ii) The sea remains warmer, so air above the sea is heated, expands, becomes less dense and rises. Cooler, denser air over the land moves out towards the sea to replace the rising air, forming the land breeze. [2 marks]
Answer 19.
- (a) The dull black can of water will cool down faster. [1 mark]
- (b) Dull black surfaces are better emitters (radiators) of heat than shiny white surfaces, so the water in the dull black can loses heat by radiation more quickly. [2 marks]
- (c) Dull black surfaces are also better absorbers of heat radiation. [2 marks]
Answer 20.
- (a) Trapped air is a poor conductor of heat, so the layer of air in the fur slows down heat loss from the bear's body by conduction and convection. [2 marks]
- (b) Blubber (fat) is a poor conductor of heat, so it reduces the rate of heat loss from the body to the cold surroundings. [1 mark]
- (c) Curling up reduces the exposed surface area of the body, so less heat is lost to the cold surroundings. [2 marks]
— End of Answer Key —