حرارت کی منتقلی

Heat travels through a solid mainly by:

• 1 Convection
• 2 Conduction
• 3 Radiation
• 4 Evaporation

Heat reaches the Earth from the Sun by:

• 1 Radiation
• 2 Reflection only
• 3 Convection
• 4 Conduction

Convection takes place in:

• 1 Fluids
• 2 Solids only
• 3 A vacuum
• 4 Metals only

Which of these is a good conductor of heat?

• 1 Air
• 2 Wood
• 3 Copper
• 4 Plastic

A vacuum flask keeps liquids hot mainly because it reduces:

• 1 Conduction, convection and radiation
• 2 Only radiation
• 3 Only conduction
• 4 Only the liquid's mass

Which colour of surface is the best absorber of heat radiation?

• 1 Dull black
• 2 Silver
• 3 Shiny yellow
• 4 White

Sea breeze is caused by:

• 1 Radiation only
• 2 Evaporation only
• 3 Conduction
• 4 Convection currents

The handle of a cooking pan is made of plastic because plastic is a:

• 1 Good conductor
• 2 Poor conductor of heat
• 3 Good radiator
• 4 Metal

Which surface is the poorest emitter of heat radiation?

• 1 Dull black
• 2 Rough brown
• 3 Dark grey
• 4 Shiny silver

Heat transfer by the movement of heated fluid is called:

• 1 Radiation
• 2 Reflection
• 3 Convection
• 4 Conduction