1. Motion, forces and energy

1.1 Physical quantities and measurement techniques

1.2 Motion

1.3 Mass and weight

1.4 Density

1.5.1 Effects of forces

1.5.2 Turning effect of forces

1.5.3 Centre of gravity

1.6 Momentum

1.7.1 Energy

1.7.2 Work

1.7.3 Energy resources

1.7.4 Power

1.8 Pressure

2. Thermal physics

2.1.1 States of matter

2.1.2 Particle model

2.1.3 Gases and the absolute scale of temperature

2.2.1 Thermal expansion of solids, liquids and gases

2.2.2 Specific heat capacity

2.2.3 Melting, boiling and evaporation

2.3.1 Conduction

2.3.2 Convection

2.3.3 Radiation

2.3.4 Consequences of thermal energy transfer

3. Waves

3.1 General properties of waves

3.2.1 Reflection of light

3.2.2 Refraction of light

3.2.3 Thin lenses

3.2.4 Dispersion of light

3.3 Electromagnetic spectrum

3.4 Sound

4. Electricity and magnetism

4.1 Simple phenomena of magnetism

4.2.1 Electric charge

4.2.2 Electric current

4.2.3 Electromotive force and potential difference

4.2.4 Resistance

4.2.5 Electrical energy and electrical power

4.3.1 Circuit diagrams and circuit components

4.3.2 Series and parallel circuits

4.3.3 Action and use of circuit components

4.4 Electrical safety

4.5.1 Electromagnetic induction

4.5.2 The a.c. generator

4.5.3 Magnetic effect of a current

4.5.4 Force on a current-carrying conductor

4.5.5 The d.c. motor

4.5.6 The transformer

5. Nuclear physics

5.1.1 The atom

5.1.2 The nucleus

5.2.1 Detection of radioactivity

5.2.2 The three types of nuclear emission

5.2.3 Radioactive decay

5.2.4 Half-life

5.2.5 Safety precautions

6. Space physics

6.1.1 The Earth

6.1.2 The Solar System

6.2.1 The Sun as a star

6.2.2 Stars

6.2.3 The Universe

IGCSE Physics 2.2.3 Melting, boiling and evaporation Question Bank

[Maximum number: 2]

A student carries out an experiment using a plastic beaker that contains 0.24 kg of water at $17^{\circ} \mathrm{C}$ . The thermal capacity (heat capacity) of the beaker is negligible.

(a)

As the temperature of the water decreases, some of the ice melts.

[ 2 ]

(i)

Explain why this ice melts.

[ 2 ]

[Maximum number: 3]

Fig. 2.1 shows an electric tumble dryer used to dry wet clothes.

Fig. 2.1

(a)

Hot air blows into the drum. The air gains water vapour from the clothes and then leaves the drum. The moist air enters the condenser. Cool air leaves the condenser, passes through the heating element and enters the drum again.

[ 3 ]

(i)

State the process by which the hot air removes water from the wet clothes.

[ 1 ]

(ii)

The air is cooled as it passes through the condenser.

Describe and explain one other way in which the air leaving the condenser is different from the air entering the condenser.
description
explanation

[ 2 ]

[Maximum number: 1]

A liquid is evaporating. The liquid is not boiling.
Which statement about the liquid is correct at an instant in time?

Any molecule can escape, and from any part of the liquid.

Any molecule can escape, but only from the liquid's surface.

Only molecules with enough energy can escape, and only from the liquid's surface.

Only molecules with enough energy can escape, but from any part of the liquid.

[Maximum number: 1]

During evaporation of a liquid, the most energetic particles escape. The temperature of the remaining liquid changes.

Which row identifies where these particles escape from and describes the temperature change?

place from which
the particles escape

temperature of
remaining liquid

body of the liquid

decreases

body of the liquid

increases

surface of the liquid

decreases

surface of the liquid

increases

[Maximum number: 1]

A liquid is evaporating. The liquid is not boiling.
Which statement about the liquid is correct at an instant in time?

Any molecule can escape, and from any part of the liquid.

Any molecule can escape, but only from the liquid's surface.

Only molecules with enough energy can escape, and only from the liquid's surface.

Only molecules with enough energy can escape, but from any part of the liquid.

[Maximum number: 1]

A liquid is evaporating. The liquid is not boiling.
Which statement about the liquid is correct at an instant in time?

Any molecule can escape, and from any part of the liquid.

Any molecule can escape, but only from the liquid's surface.

Only molecules with enough energy can escape, and only from the liquid's surface.

Only molecules with enough energy can escape, but from any part of the liquid.

[Maximum number: 1]

Wet clothes are hanging outside to dry.
What are the best conditions for the clothes to dry most quickly?

wind speed

temperature

high

low

high

low

[Maximum number: 1]

A circular, flat-bottomed dish contains $100 \mathrm{~cm}^{3}$ of water.
Students are asked how to increase the rate at which the water evaporates.
Their suggestions are listed.
student 1 Pour the water into a flat-bottomed dish of larger diameter.
student 2 Cool the dish and water.
student 3 Create a current of air over the dish with a fan.
Which suggestions will increase the rate of evaporation?

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

[Maximum number: 1]

Which row correctly describes boiling and evaporation of water?

boiling

evaporation

bubbles seen

occurs at surface only

bubbles seen

occurs throughout the water

no bubbles

occurs at surface only

no bubbles

occurs throughout the water

[Maximum number: 7]

Fig. 3.1 and Fig. 3.2 show how a puddle of water changes on a warm windy day.

Fig. 3.1

Fig. 3.2

(a)

Describe the process by which the volume of water in the puddle decreases.

[ 2 ]

(b)

State and explain one change in the weather that would cause the volume of water in the puddle to decrease more slowly.
statement
explanation

[ 2 ]

(c)

Explain, in terms of molecules, how sweating helps to cool your body on a hot day.

[ 3 ]

0 selected

Question 2

Question 2(c)

Question 2(c)(i)

Question 2

Question 2(a)

Question 2(a)(i)

Question 2(a)(ii)

Question 12

Question 12

Question 12

Question 12

Question 13

Question 13

Question 13

Question 3

Question 3(a)

Question 3(b)

Question 3(c)