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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

Moving From Hot To Cold – Quiz

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Moving From Hot To Cold HIA Science quiz: free practice for HIA International. Work through this Moving From Hot To Cold HIA Science quiz and get instant feedback on every answer. If you get stuck, review the 21.11 Moving From Hot To Cold – Notes lesson. More practice: HIA International — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: A-
  • Time limit:
Start Quiz
1.
Which method of heat transfer works through a vacuum?
Radiation
Conduction
Convection
Evaporation
2.
Why does warm air rise?
It is less dense than the cooler air around it
It is attracted upwards
It is heavier
It contains more oxygen
3.
Why is a wool jumper warm?
It traps air, which is a poor conductor
Wool is a good conductor
Wool produces heat
Wool reflects all radiation
4.
What is conduction?
Transfer by infrared waves
Cooling by evaporation
Transfer of thermal energy through a solid by particle collisions
Transfer by a moving fluid
5.
What is convection?
Transfer through a vacuum
Transfer by light only
Transfer of thermal energy by a moving fluid
Transfer by particle collisions in solids only
6.
Why are metals good conductors of thermal energy?
They contain air
They have free electrons that carry energy
They are always hot
They are shiny
7.
Why do saucepans often have plastic handles?
Plastic is an insulator, so it slows conduction to your hand
Plastic reflects radiation
Plastic conducts heat well
Plastic makes the pan heat faster
8.
Why is the heating element at the bottom of a kettle?
Hot water rises and cool water sinks, setting up convection currents
The bottom is the only place it fits
Heat can only travel downwards
Water conducts heat best at the bottom
9.
What drives the flow of thermal energy?
A temperature difference
A difference in colour
A difference in volume
A difference in mass
10.
How does closing a loft hatch reduce heat loss?
It increases conduction through the ceiling
It stops warm air rising into the loft by convection
It adds free electrons
It stops radiation from the Sun
11.
Sweat cools the skin by which process?
Evaporation
Convection in the blood only
Radiation from the Sun
Conduction through bone
12.
In the diagram, pins are stuck with wax to rods heated at one end. On which rod will the pins fall first?
Dr Dabour Hub Academy - figure 1
Copper
All at the same time
Iron
Glass
13.
For the rods experiment to be a fair test, what must be kept the same?
Dr Dabour Hub Academy - figure 2
The rod material
The time taken for pins to fall
The number of rods tested only
The length and thickness of the rods and the heat source
14.
Which safety precaution is most important in the rods experiment?
Dr Dabour Hub Academy - figure 3
Heat glass rods until they melt
Do not touch the rods after heating; they stay hot for a long time
Hold the rods by the heated end
Use a very large flame
15.
Using the bar chart, how many times longer did the glass rod take than the copper rod?
Dr Dabour Hub Academy - figure 4
4 times
300 times
15 times
20 times
16.
Using the bar chart, rank the rods from best to worst conductor.
Dr Dabour Hub Academy - figure 5
Glass, iron, aluminium, copper
Copper, aluminium, iron, glass
Aluminium, copper, glass, iron
Iron, copper, glass, aluminium
17.
In the diagram, why does the coloured water rise above the flame?
Dr Dabour Hub Academy - figure 6
Heated water becomes denser and sinks
Heated water expands, becomes less dense and rises
Cold water rises
The crystal pushes it up
18.
In the diagram, why does the water sink on the far side?
Dr Dabour Hub Academy - figure 7
It evaporates
It is pushed by the flame
It has cooled, become denser and sinks
It is heated there
19.
In the vacuum flask diagram, which label points to the vacuum?
Dr Dabour Hub Academy - figure 8
C
D
A
B
20.
In the vacuum flask, what is the job of the silvered surface C?
Dr Dabour Hub Academy - figure 9
To let convection happen
To make the flask heavier
To conduct heat away quickly
To reflect infrared radiation back towards the drink
21.
How does the vacuum B reduce energy transfer?
Dr Dabour Hub Academy - figure 10
It has no particles, so conduction and convection cannot happen
It adds heat to the drink
It reflects all radiation
It traps convection currents
22.
Using the graph, which can loses energy faster?
Dr Dabour Hub Academy - figure 11
Neither cools
The dull black can
The shiny silver can
Both at the same rate
23.
Using the graph, what is the difference in temperature between the cans after 10 minutes?
Dr Dabour Hub Academy - figure 12
61 °C
44 °C
36 °C
17 °C
24.
What conclusion does the graph support?
Dr Dabour Hub Academy - figure 13
Dull black surfaces emit infrared radiation faster than shiny silver ones
Colour has no effect on cooling
Black cans gain heat
Silver surfaces are better emitters
25.
In the diagram of the room, at which point is warm air rising?
Dr Dabour Hub Academy - figure 14
S
R
P
Q
26.
In the room diagram, where is cooler air sinking?
Dr Dabour Hub Academy - figure 15
Q
S
P
R
27.
Using the bar chart, which wrapping was the best insulator?
Dr Dabour Hub Academy - figure 16
Wool
Nothing
Fleece
Cotton
28.
What is the third step in the flow chart?
Dr Dabour Hub Academy - figure 17
Energy is passed on by collision, flowing or radiating
A temperature difference exists
The difference falls
Energy reaches the cooler region
29.
Use the table. Which method needs particles that are free to move?
Radiation
Conduction in a vacuum
None
Convection
30.
Use the table. How can conduction through a spoon be reduced?
Use a plastic handle
Silver the surface
Close the loft hatch
Cover the liquid
31.
Use the table. Which surface would be best for a teapot that keeps tea hot?
Matt dark grey
Matt white
Dull black
Shiny silver
32.
Use the table. What is the mean time for the copper rod?
16 s
17 s
48 s
15 s
33.
Use the table. Which result is anomalous?
Iron trial 3
Iron trial 2
Iron trial 4
Iron trial 1
34.
Use the table. Which material would be best for the base of a frying pan?
Glass
Copper
Wood
Plastic
35.
A student's notes contain one mistake. Which row?
Conduction - mainly solids
Radiation - needs particles
Convection - liquids and gases
Evaporation - liquid surfaces
36.
Use the table. Why is a double-glazed window better than a single one?
The trapped air or gas gap is a poor conductor
Glass is a good conductor
It allows convection currents outside
The window reflects all light
37.
How could the black and silver can experiment be improved?
Use the same volume of water at the same starting temperature, with lids, and repeat
Start the cans at different temperatures
Take only one reading
Use different volumes of water in each can
38.
A student wants to find which material makes the best oven glove. Which plan is best?
Touch hot pans with each glove
Wrap equal thicknesses of each material around identical hot water tubes and measure the temperature drop over the same time
Use a different temperature for each material
Test each material on a different day
39.
Which pairing of method and example is correct?
Convection - spoon in hot tea
Evaporation - vacuum flask
Conduction - warm air rising
Radiation - warmth from the Sun
40.
Match the term to its description: Radiation
Transfer by collisions in a solid
A material that transfers heat slowly
Transfer of thermal energy by infrared waves, needing no particles
Transfer by a moving fluid
41.
A material that transfers thermal energy only slowly is an _____.
emitter
insulator
electron
conductor
42.
A space with no particles is called a _____.
vacuum
solid
fluid
conductor
43.
Warm fluid rises because it is less _____.
free
dense
heavy in mass
hot
44.
Thermal energy always moves from hot to cold. True or false?
False, cold moves to hot
True
True, but only in metals
False
45.
Radiation is the only method that works through a vacuum. True or false?
True
False, conduction also works
False, convection works best
False
46.
Convection can happen in solids. True or false?
True, in metals
False, it only happens in a vacuum
False
True
47.
A vacuum flask reduces conduction, convection and radiation. True or false?
False, it only reduces radiation
True
False
True, but only conduction and convection
48.
Air is a poor conductor, so trapped air makes a good insulator. True or false?
False
False, air conducts well
True
True, but only when moving
49.
A metal spoon in hot tea gets hot at the handle by convection. True or false?
True
False, it is by radiation only
True, the spoon flows
False
50.
Dull black surfaces are better emitters of radiation than shiny silver ones. True or false?
False
True
False, silver emits more
False, colour makes no difference
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Part of Unit 3: Forces and energy — see every lesson and quiz in this unit.
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