Heat

What will happen if ice cubes are added to a glass of hot water?

(Select all correct answers)

• The hot water gains heat.

• The ice cubes gain heat.

• The hot water loses heat.

• The ice cubes lose heat.

In the diagram below, four thumbtacks are attached to an iron rod with wax.

Which two thumbtacks will drop off at about the same time?

• A and B

• B and C

• B and D

• C and D

The instrument below is used to measure the temperature of _____.

• ice

• burning flame

• boiling water

• human body

Which of the following best represents X and Y?

• X : Silver

  Y : Gold

• X :Aluminium

  Y : Wood

• X : Air

  Y : Wool

• X : Water

  Y : Nickel

Sue placed a metal ball on a metal ring as shown in the diagram below.

The ball could not pass through the ring. What could she do to make the metal ball pass through the ring?

(Select all correct answers)

• Cool the metal ring to contract it.

• Cool the metal ball to contract it.

• Heat up the metal ring to expand it.

• Heat up the metal ball to expand it.

If the water in the beakers is boiled using the same kettle, which beaker of water will be the first to boil?

• A

• B

• C

• D

If the test-tube X is put into a beaker of ice cubes, the drop of ink will _______.

• evaporate

• move towards X

• move towards Y

• remain where it is

Sam places a metal spoon in a cup of hot coffee.

The spoon becomes hotter after a while. 

 

Which one of the following explains this?

• The cup loses heat to the hot coffee.

• The spoon loses heat to the hot coffee.

• The hot coffee gains heat from the spoon.

• The spoon gains heat from the hot coffee.

Which one of the following flask contains water with the greatest amount of heat?

 

• A

• B

• C

• D

Four cups at room temperature of 25^oC were placed into the freezer for 3 minutes. The table shows the temperature after 3 minutes.

Which cup is most suitable to keep hot drink hot for the longest time? Explain why.

• A. It is the poorest conductor of heat.

• B. It conducts heat fastest from the cup to the surrounding.

• C. It is the best conductor of heat.

• D. It conducts heat slowest from the cup to the surrounding.