S1G1 Ch 5 Heat-Mastering Your Learning

Two liquids, one at 80 °C and the other at 30 °C, are mixed. What is likely to be the temperature of the mixture?

• 26 °C

• 55 °C

• 80 °C

• 90 °C

“The small spoon is hotter than the large spoon.” What can be concluded based on this statement?

• The small spoon has gained less heat than the large spoon.

• The small spoon has gained more heat than the large spoon.

• The temperature of the small spoon is higher than that of the large spoon.

• The temperature of the small spoon is lower than that of the large spoon.

John heated 60 cm³ of aluminium, carbon dioxide and water from room temperature to 50 °C. Which substance will expand the most?

• aluminium metal

• carbon dioxide gas

• water

• They expand by the same amount.

The graph below shows the temperature changes when a beaker of water was heated. At which point, A, B, C or D, was the heat source removed?

• A

• B

• C

• D

John wanted to measure the temperature of a beaker of water. Which set-up shows the correct position of the thermometer?

• (Thermometer above water)

• (Thermometer just touching the surface of water)

• (Thermometer fully immersed in water, not touching the bottom)

• (Thermometer slanted and touching the side of the beaker)

Ali wanted to heat three containers of water P, Q and R at room temperature to 90°C. Which container(s) of water will require the least amount of heat?

• largest mass of water

• smallest mass of water

• smallest mass of water

• same mass of water

What will happen if the distance, x, between the contacts is greater?

• The alarm will sound all the time.

• The alarm will sound more loudly.

• The temperature needs to be higher for the alarm to sound.

• The temperature needs to be lower for the alarm to sound.

There are gaps between the metal rails in a railway track as shown below. What happens to the gaps in hot weather?

• The gaps become narrower because the metal rails contract.

• The gaps become narrower because the metal rails expand.

• The gaps become wider because the metal rails contract.

• The gaps become wider because the metal rails expand.

A student is unable to open the metal cap of a bottle. What can he do to unscrew the cap?

• Cool the cap only.

• Heat the bottle only.

• Heat the cap only.

• Heat the bottle and the cap.

A thermometer can be used to measure the amount of heat.

• No, a thermometer measures temperature, not the amount of heat.

• Yes, a thermometer measures the amount of heat directly.

• Yes, because heat and temperature are the same thing.

• No, a thermometer measures only the pressure of a substance.