“When a layer of air receives enough heat from Earth's surface, it expands and becomes less dense. This layer is then pushed upward by buoyancy. The cool and heavy air sinks under this layer. This cycle repeats with the re-heating of the cool air.” The phenomenon described in the preamble is known as?
Convection
Conduction
Radiation
Induction
One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be?
80°C
more than 50°C but less than 80°C
20°C
between 30°C and 50°C
Heat is transferred from the hotter end to the colder end of an object is known as?
Vaporisation
A wooden spoon is dipped in a cup of ice cream. Its other end?
becomes cold by the process of conduction.
becomes cold by the process of convection.
becomes cold by the process of radiation.
does not become cold.
The materials which do not allow heat to pass through them easily are called?
Metals
Plastics
Conductors
Insulators
Transfer of heat in liquids and gases are called?
Transfer of heat in solids is called?
Which heat transmission does not any medium?
Which of the following methods of heat transfer does not involve the movement or vibration of particles?
Circulation
The materials which allow heat to pass through them easily are called?
Gases
