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HIA International — Grade 8

Unit 1: Photosynthesis and the carbon cycle

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Unit 2: Properties of materials

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Unit 3: Forces and energy

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Unit 4: Maintaining life

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Unit 5: Reactivity

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Unit 6: Sound and space

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Unit 7: Genes and inheritance

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Unit 8: Rates of reaction

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Unit 9: Electricity

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Quiz

Cooling By Evaporation – Quiz

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Cooling By Evaporation HIA Science quiz: free practice for HIA International. Work through this Cooling By Evaporation HIA Science quiz and get instant feedback on every answer. If you get stuck, review the 21.13 Cooling By Evaporation – Notes lesson. More practice: HIA International — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: A-
  • Time limit:
Start Quiz
1.
Why does evaporation cool the remaining liquid?
The liquid loses mass only
The fastest particles escape, lowering the average energy of those left
Cold air is drawn into the liquid
The container conducts heat in
2.
Which conditions dry washing fastest?
Humid and covered
Cold, still and folded
Warm, windy and spread out
Cool and indoors
3.
How does evaporation differ from boiling?
Evaporation happens throughout the liquid
They are identical
Evaporation happens at the surface and at any temperature
Evaporation needs a higher temperature
4.
What does volatile mean?
Not able to evaporate
Very dense
Very hot
Evaporating easily at room temperature
5.
What is humidity?
How hot the air is
How much water vapour the air already holds
How much liquid is in a dish
How fast the wind blows
6.
Why does sweating cool the body?
Sweat is colder than the body
Sweat evaporates from the skin, taking energy away
Sweat reflects sunlight
Sweat blocks radiation
7.
Why does a lid on a saucepan slow evaporation a lot?
The lid increases the surface area
The lid adds particles
The lid makes the water colder
Vapour cannot escape into the air
8.
Why does evaporation happen faster in a warm place?
More particles have enough energy to escape
The surface area shrinks
The air becomes more humid
The particles get bigger
9.
Why does a larger surface area speed up evaporation?
The humidity rises
The liquid becomes more volatile
More particles are at the surface where they can escape
The liquid gets hotter
10.
Why does wind speed up evaporation?
It makes the liquid denser
It lowers the surface area
It adds energy to every particle
It carries the vapour away so the air near the surface is less humid
11.
Why is drying slow in a damp bathroom?
There is too much wind
The air is already full of water vapour
The surface area is too large
The bathroom is too warm
12.
Why does nail varnish remover evaporate faster than water?
It is more volatile because its particles are held by weaker forces
It is always hotter
It is denser than water
It has stronger forces between particles
13.
The graph shows two thermometers in a breeze. Why does the wet-bulb reading fall?
Dr Dabour Hub Academy - figure 1
Water evaporating from the cloth takes energy from the bulb
The dry bulb is broken
Water is always colder than air
The breeze is colder than the room
14.
Using the graph, how much lower is the wet-bulb reading than the dry-bulb reading after 10 minutes?
Dr Dabour Hub Academy - figure 2
6.5 °C
22 °C
3 °C
15.5 °C
15.
What is the role of the dry-bulb thermometer in the experiment on the graph?
Dr Dabour Hub Academy - figure 3
It is a control showing the air temperature without evaporation
It has no purpose
It speeds up evaporation
It measures humidity directly
16.
Using the bar chart, what happens to the mass lost when the surface area doubles?
Dr Dabour Hub Academy - figure 4
It quadruples
It doubles
It stays the same
It halves
17.
Using the bar chart pattern, predict the mass lost from a dish of 10 cm².
Dr Dabour Hub Academy - figure 5
1.5 g
6 g
0.5 g
3 g
18.
Using the graph, which liquid is the most volatile?
Dr Dabour Hub Academy - figure 6
Water
All the same
Ethanol
Nail varnish remover
19.
Using the graph, what mass of ethanol evaporated in 20 minutes?
Dr Dabour Hub Academy - figure 7
6 g
4 g
0.8 g
10 g
20.
Which safety precaution matters most when comparing the evaporation of ethanol and nail varnish remover?
Dr Dabour Hub Academy - figure 8
Seal them tightly while measuring
Smell them to compare
Heat them over a Bunsen burner
Keep them away from flames and work in a ventilated room
21.
In the diagram, why can particle X escape from the liquid?
Dr Dabour Hub Academy - figure 9
It is at the bottom
It is moving fast enough and is at the surface
It has been heated to boiling point
It is the slowest particle
22.
After particle X in the diagram escapes, what happens to the average energy of the particles left?
Dr Dabour Hub Academy - figure 10
It stays the same
It decreases
It increases
It becomes zero
23.
Using the bar chart, how much faster (in minutes) did the cloth dry with the fan on high than with no fan?
Dr Dabour Hub Academy - figure 11
25 minutes
60 minutes
35 minutes
22 minutes
24.
Which dish in the diagram will lose water fastest?
Dr Dabour Hub Academy - figure 12
All the same
A: wide and open
B: narrow and open
C: wide with a lid
25.
Which dish in the diagram will lose the least water?
Dr Dabour Hub Academy - figure 13
C: wide with a lid
All the same
B: narrow and open
A: wide and open
26.
Using the graph, how does humidity affect drying time?
Dr Dabour Hub Academy - figure 14
Higher humidity makes drying faster
Higher humidity makes the drying time longer
Humidity has no effect
Drying stops at 45% humidity
27.
What is the last step in the flow chart?
Dr Dabour Hub Academy - figure 15
Particles move at different speeds
The liquid boils
Fastest reach the surface
The average energy falls, so the liquid cools
28.
Use the table. Which factor makes evaporation slower when it increases?
Humidity
Wind
Temperature
Surface area
29.
Use the table. What is the missing mass lost on day 3?
15 g
25 g
20 g
5 g
30.
Use the table. Which place will dry clothes fastest?
Place 4
Place 3
Place 2
Place 1
31.
Use the table. What is the mean drying time with the fan on low?
40 minutes
36 minutes
114 minutes
38 minutes
32.
Use the table. Which result is anomalous?
Trial 4
Trial 3
Trial 2
Trial 1
33.
Use the table. Which liquid has the weakest forces between its particles?
Liquid S
Liquid Q
Liquid R
Liquid P
34.
A student's notes have one mistake. Which row?
Wind speeds up evaporation
Evaporation happens at the surface
Evaporation cools the liquid left
Evaporation happens only at 100 °C
35.
Use the table. By how many degrees did the skin cool when ethanol was dabbed on it?
4 °C
29 °C
33 °C
2 °C
36.
In an experiment on surface area, which variables must be controlled?
The mass lost
Volume of water, temperature, wind and humidity
The surface area of the dish
The time the dish is weighed only
37.
How can the student measure the rate of evaporation most accurately?
Guess when it has dried
Weigh the dish on a balance at regular times
Look at the water level by eye
Count the particles
38.
A student wants to test whether wind speed affects evaporation. Which plan is best?
Test one cloth only
Change the temperature and fan speed together
Use cloths of different sizes at one speed
Place identical wet cloths in front of a fan at different speeds and time how long each takes to dry
39.
Which pairing of factor and everyday example is correct?
Surface area - lid on a saucepan
Temperature - damp bathroom
Wind - windy washing line
Humidity - washing drying in the sun
40.
Match the term to its description: Cooling
How much vapour the air holds
The fall in temperature left behind when the fastest particles escape
The area of liquid exposed to air
Evaporating easily
41.
The area of liquid exposed to the air is its _____.
volume
humidity
surface area
density
42.
Warmth, wind and a large surface area all _____ evaporation.
stop
speed up
reverse
slow down
43.
An extractor fan in a bathroom reduces the _____ of the air.
volatility
density
temperature
humidity
44.
Evaporation happens at any temperature. True or false?
True, but only for water
True
False
False, only at 100 °C
45.
Evaporation takes place throughout a liquid. True or false?
False, it takes place only at the bottom
True
False
True, like boiling
46.
Evaporation cools the liquid that is left behind. True or false?
False
True, but only in winter
False, it heats it up
True
47.
High humidity speeds up evaporation. True or false?
False, humidity has no effect
True
False
True, damp air helps drying
48.
A dog pants on a hot day to cool down by evaporation from its tongue. True or false?
False
False, panting warms the dog
True
False, dogs cannot evaporate water
49.
Spreading a puddle out helps it evaporate faster. True or false?
True
True, but only at night
False
False, it slows evaporation
50.
Latent heat is the energy needed for particles to escape the liquid. True or false?
True
False
False, it is the energy of the wind
False, it is the temperature of the air
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Part of Unit 3: Forces and energy — see every lesson and quiz in this unit.
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