Question 1

When heat is supplied to a body,

Accepted Answer

there is an increase in the internal energy of the body.

Answer

the body undergoes a change of state.

Answer

the particles in the body move or vibrate faster.

Answer

there is always an increase in the temperature of the body.

Question 2

The increase in temperature when heat is supplied to a body can be explained by

Accepted Answer

an increase in the average kinetic energy of the particles in the body

Answer

an increase in the average spacing of the particles in the body

Answer

a decrease in the internal energy of the particles in the body.

Answer

a decrease in the average speeds of the particles in the body.

Question 3

When some coloured water is heated in the flask shown below, it is observed that the water level in the tube rises. Which of the following statements best explains this observation?

Accepted Answer

The coloured water increased in volume, as the heat absorbed increased the internal energy of the coloured water

Answer

The coloured water increased in volume, as the water molecules became bigger.

Answer

The coloured water increased in mass, as the heat absorbed increased the potential energy of the water molecules.

Answer

The coloured water increased in mass, as the heat absorbed increased the kinetic energy of the water molecules.

Question 4

A large piece of pure ice at 0°C is left under the hot Sun. After a while, some of the ice melts away. What is the likely temperature of the remaining ice?

Accepted Answer

0°C

Answer

Slightly less than 0°C

Answer

Slightly greater than0°C

Answer

Approximately room temperature

Question 5

Some alcohol and water were spilled on a table and a short while later, the alcohol ‘disappeared’ from the table, but not the water. Why is this so?

Accepted Answer

Water has a higher boiling point than alcohol, and therefore more heat is needed for water to evaporate.

Answer

Additional energy is required to push back the air molecules in the atmosphere when water changes into vapour, but this is not the case for alcohol.

Answer

The amount of energy needed to break the bonds between the particles is smaller for water than for alcohol.

Answer

Alcohol molecules move faster than water molecules at the same temperature

Question 6

Which of the following represents the melting curve of water?

Accepted Answer

https://uploads.quizalize.com/37bdddcb-3b24-4aca-b751-4ca9decbfcb2/question/94c403d61a06461f0d5bdf32d95dd27ac3d3c5ea.JPG

Answer

https://uploads.quizalize.com/37bdddcb-3b24-4aca-b751-4ca9decbfcb2/question/4117e5c10192abd50268e02cdf6b9b75c6dfe23a.JPG

Question 7

Why does a pure substance melt at a constant temperature?

Accepted Answer

The heat absorbed during melting is used to break the bonds between the

particles.

Answer

Negligible (i.e. very little) heat is absorbed during this process.

Answer

All pure substances melt at 0°C.

Answer

The heat absorbed during melting is used to increase the kinetic energies of the particles, and not the temperature of the substance.

Question 8

Pure water at room temperature is put in a freezer, where the temperature has been preset to –10°C. After 30 minutes, Ali opens the freezer to discover that the water has yet to freeze. Which of the following statements best explains why the water has not frozen?

Accepted Answer

The kinetic energy of the water molecules is still decreasing.

Answer

The temperature in the freezer is –10°C and not 0°C, so it takes a longer time for the water to freeze.

Answer

The water has not gained enough thermal energy to form ice.

Answer

The water molecules are getting smaller in size, but not small enough to form ice yet.

Question 9

In which of the following scenarios would a piece of wet cloth dry the fastest?

Accepted Answer

A

Answer

C

Answer

B

Answer

D

Question 10

The rate of evaporation is affected by several factors. Which statement describes one of the factors correctly

Accepted Answer

Lower atmospheric pressure increases the rate of evaporation.

Answer

A smaller exposed surface area increases the rate of evaporation.

Answer

Higher humidity increases the rate of evaporation.

Answer

A lower surrounding temperature increases the rate of evaporation.

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