# EM Waves, Waves and Thermal Prop Revision_4NA(From WA)

## Quiz by Jessica Lew

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15 questions
• Q1

When the temperature of water changes from 40°C to 100°C as shown in the graph,

its internal kinetic energy increases but the potential energy decreases.

both its internal kinetic energy and internal potential energy increase

its internal kinetic energy increases but the potential energy remains constant.

its internal potential energy increases.

120s
• Q2

The graph  shows how the temperature of a substance varies with time.

What could section XY of the graph represent?

solidification

convection

evaporation

melting

120s
• Q3

When water evaporates,what happens to its molecules?

They escape from the surface.

They attract each other more strongly.

They collide more often with each other.

They split up into several atoms.

120s
• Q4

A jug of water is at room temperature. Several ice cubes at a temperature of 0°C are dropped into it and they begin to melt immediately. What happens to the temperature of the water and to the temperature of the ice cubes while they are melting?

A

B

C

D

120s
• Q5

The diagram represents the electromagnetic spectrum. Which part of the spectrum is found in region O?

X-rays

visible light

120s
• Q6

Which of the following uses radio waves?

detecting fake notes

killing cancerous cells

transmitting communication signals

heating food

120s
• Q7

Which of the following statements is true for all electromagnetic waves?

They cannot transfer energy when travelling in vacuum.

They carry no electric charge.

They travel at 3 x 108 m/s regardless of the medium.

They travel faster in solid than air.

120s
• Q8

A student tunes his radio to a station broadcasting on 95 MHz.

its amplitude

its speed

its frequency

its wavelength

120s
• Q9

The wavelength of a wave is

the distance between2 adjacent points in phase.

the distance between a crest to a trough

the distance between any 2 crests.

the maximum displacement of a point from its normal undisturbed position

120s
• Q10

Which points are in phase?

Q and T

P and Q

P and R

Q and S

120s
• Q11

When heat is supplied to a body,

the body undergoes a change of state.

the particles in the body move or vibrate faster.

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

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

120s
• Q12

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

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

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

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

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

120s
• Q13

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?

Slightly less than 0°C

0°C

Slightly greater than 0°C

Approximately room temperature

120s
• Q14

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?

Alcohol molecules move faster than water molecules at the same temperature.

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.

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

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

120s
• Q15

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

Lower atmospheric pressure increases the rate of evaporation.

Higher humidity increases the rate of evaporation.

A smaller exposed surface area increases the rate of evaporation.

A lower surrounding temperature increases the rate of evaporation.

120s

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