Click the correct answer (True or False).
Click the correct answer.
An iron ball at 50 °C is dropped in a mug containing water at 50 °C. How does the heat flow?
The heat flows from the ball to the water.
The heat flows from the water to the ball.
The heat does not flow.
The heat increases the temperature of both.
Which of the following is an example of convection?
Heat from an electric bulb
Heat from a bonfire
Heat from red hot iron rod
Formation of sea breeze
Which of the following processes of heat transfer takes place in solids?
Conduction
Convection
Radiation
Vaporisation
Which of the following is the fastest mode of heat transfer ?
Conduction
Convection
Radiation
Heating
Click the correct answer.
Conduction is the fastest mode of heat transfer in
.
solids
liquids
gases
solids,
Convection cannot take place in solids because
.
actual movement of particles is not possible
solids possess free electrons
atoms are loosely packed
they are bad conductors
The sides of the double walls of a thermos flask facing each other are made shiny because
.
shiny surfaces absorb more heat
shiny surfaces are bad radiators of heat
shiny surfaces are good conductors
shiny surfaces are bad absorbers of heat
Temperature of an object can be measured in
.
degree Celsius (°C)
degree Fahrenheit (°F)
kelvin (K)
degree Celsius (°C), degree Fahrenheit (°F) and kelvin (K)
The fixed temperature at which a gas changes to its liquid state is called its
.
melting point
ice point
freezing point
condensation point
