Physics Quiz
Thermal Heat Transfer
Question 1
What is the method of heat transfer from the
heater to the metal plate?
Answer: Radiation
Question 2
What is the method of heat transfer from
the metal plate to the wax?
Answer: Conduction
Question 3
What is the method of heat transfer
from the wax to the cork?
Answer: Conduction
Question 4
Which stopper will slide down first? Why?
Answer: Stopper from the dull black metal plate
because black is a better absorber of heat than
shiny surface.
Question 5
Which heat transfer
method(s) will the vacuum
layer of the thermal flask help
to minimise?
Answer: Conduction and
Convection
Question 6
Which heat transfer
method(s) will the silvered
wall of the thermal flask help
to minimise?
Answer: Radiation
Question 7
Which heat transfer
method(s) will the plastic cap
of the thermal flask help to
minimise?
Answer: Conduction (since it
is made of an insulator) and
Convection (since it does not
allow convection current to transfer
heat out of the flask)
Question 8
Hot
substance
Styrofoam box
Styrofoam box is used to contain hot substances
because styrofoam is a good …………………
Answer: insulator
Question 9
Besides colour and texture, what are the
other factors that will affect the rate of heat
transfer by radiation?
Answer: Surface temperature and
surface area
Question 10
What is the colour of
the cooling fin?
Answer: Black
(Black is a good emitter of heat)
Question 11
Metal is the material
used for cooling fin
because it is a good
…………………
Answer: conductor
Question 12 - True or False
Radiation of heat can take place without a
medium
Answer: True
Question 13 - True or False
Convection of heat is caused by molecular
vibration.
Answer: False
Convection is caused by density difference.
Molecular vibration causes conduction of heat
Question 14 - True or False
Poor conductors are good insulators.
Answer: True
Question 15 - True or False
Gases are better conductor than solids.
Answer: False
(Gas particles are very far apart hence it is difficult to
transfer heat by molecular vibration among the particles.)
Question 16 - True or False
Convection can take place in gas and
liquid only.
Answer: True
Question 17 - True or False
Shiny surfaces are good absorber of heat.
Answer: False
Shiny surface will reflect heat hence it is
a poor absorber of heat.
Question 18 - True or False
Black and rough surfaces are good
emitter of heat.
Answer: True
Question 19 - True or False
Hot tea in a black cup cools down faster than
hot tea in a white cup.
(Assuming the temperature of the tea in both cups are
the same and the material of the cups are the same.
Answer: True
Question 20 - True or False
Metals are better conductor than nonmetals.
Answer: True
(because metals have free electrons that
helps in heat transfer by molecular vibration)