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WorksheetsThe Incredible Energy Review Quiz
Total questions: 36
Worksheet time: 36mins
Insulating the walls and roof of your house reduces heat loss mainly by reducing
Convection
Conduction
Radiation
Evaporation
In an experiment you have tested cardboard and bubblewrap how well they can keep the heat in a soda can. For the experiment is NOT important that:
the water in all cans is not at the same starting temperature
you have different liquids in the cans, for example oil or water
you have different sized cans
you have a different amount of water in each can
Older-style light-globes contains a metal wire through which electricity flows. The electricity is mostly converted into:
electric energy
light energy
heat energy
magnetic energy
Look at the graph (click). Which material is the best insulator (can keep the heat the best/longest)?
No insulation
Cotton wool
Polystyrene foam
This is a trick question!
You are roasting marshmallows in a campfire with a metal rod. By which method is heat moving along the rod?
Conduction
Convection
Radiation
Evaporation
After a long drive on your motorbike, you check the pressure and see it has increased. This is because:
the tyre gets weak as it heats up
air leaks into the hot tyres
air molecules move faster when hot
the tyres expand on heating
Metal pots and pans often have a wooden or plastic handle. This is because these handles do not:
support convection easily
support conduction easily
support radiation easily
support teleportation easily
An example of a heat insulator is
an iron rod
a copper rod
an aluminium rod
a wooden rod
When a fire is lit the smoke usually rises into the air. this is caused by
conduction
convection
reflection
radiation
On a hot day, a black can feels hotter than a white and grey can, because:
the black can absorbs heat better
the black can is a better conductor
the black can reflects the heat radiation better
the grey and white can radiates the heat better than the black can
Heat from the sun reaches Earth via
conduction
convection
absorption
radiation
Milk tankers are silver or white because the colours:
look pretty
reduce friction
reflect heat
radiate heat
Roof insulation ___________________
keeps heat out in summer
keeps heat in in winter
saves energy cost
all of the above
The boiling point of water under normal conditions is
0°C
37°C
100°C
200°C
Which is correct?
Heat and Temperature are the same thing
Temperature is the amount of heat in the particles of a body
Temperature is the total kinetic energy change of a body
Heat is actually the amount of expansion of a body
You test the hypothesis that 13 years old boys are taller than 13 years old girls. You argue that all participants should be barefoot, because
sole thickness of shoes varies
some students have Nike, others Adidas
black shoes absorb heat better
bare feet are always flat on the ground
Which cannot be measured by everyday instruments
height
weight
colour
length
What is an observation in science?
anything that is obvious to everybody
things that we can see with our eyes
things that we can detect with our senses
our opinion about what we can see
What is not a safety hazard during a prac?
throwing school bags in walkways
drinking from unlabelled jars and bottles
food on the workbench next to chemicals
an unattended Bunsen burner on yellow flame
What colour would you advise cricket players to wear
Black -- because it's cooler in summer
Red -- because it reflects red sunlight
Blue -- because it blends in with the shoes
White -- because it reflects the solar radiation
Why are solar hot water heaters black?
to reflect heat radiation better and heat the water
to absorb heat radiation better and heat the water
to transfer heat radiation by convective conduction
to transfer heat radiation by conductive convection
Where does this house need better insulation so that heat does not escape (blue colours = cooler, red colours = hotter)
the roof
the windows
the walls
the chimney
A cold object eventually heats up to the same temperature as its surroundings
True
False
Conduction is fast in insulators
True
False
Heat transfer by conduction is very slow in liquids and gases
True
False
The hotter an object, the less radiation it emits
True
False
When an object absorbs radiation, it gets hotter
True
False
Click on the image.
The glasses were heated for different lengths of time. Which beaker received the most heat?
A
B
C
D
Click on the image.
The glasses were heated for different lengths of time. Which beaker do you think has the highest temperature?
A
B
C
D
Click on the image.
The glasses were heated for different lengths of time. Which beaker do you think has the lowest temperature?
A
B
C
D
Heat transfer by conduction:
particles heat up, causing them to hit each other more --> heat is produced
particles heat up, causing them to rise and; cold particles move down --> heat is produced
radiation shines on particles which shine back --> heat is produced
Heat transfer by convection:
particles heat up, causing them to hit each other more --> heat is produced
particles heat up, causing them to rise and; cold particles move down --> heat is produced
radiation shines on particles which shine back --> heat is produced
Click on the image. Identify the energy chain.
potential energy river water --> radiation kinetic energy
potential energy reservoir --> mechanical radiation energy
kinetic energy turbine --> electric energy
potential power lines energy --> mechanical river energy
Explain heat energy with the kinetic particle model: Heating a substance, ______
increases the kinetic energy of the particles, raising the temperature
increases the potential energy of the particles, lowering the temperature
increases the mechanical energy of the particles, making them go faster
increases the radiation energy of the particles, changing the colour
Potential energy is calculated as
Ep = m g h (with g = 10 m/s/s)
What Ep does a cat of 5 kg at a height of 2 m have?
50 J
100 J
150 J
200 J
Kinetic energy is calculated as Ek=21m×v×v (or Ek=21m×v2)
What Ek does a cat of 5 kg have with v=2 metres per second?
10 J
20 J
50 J
100 J
