Heat Transfer

How does the egg get heated through the metal pan?

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• by conduction

• by convection

• by radiation

The egg gets poached by what method of heat transfer?

• conduction

• convection

• radiation

Grilling eggs is not common, but what type of heat transfer is employed in this method which doesnt touch the flame?

• Conduction

• Convection

• Radiation

The drawing pins are attached to on different material to check which rod is the best conductor. The drawing pin falls first for the best conducting rod. Which drawing pin falls first? The one attached to

• Iron

• Copper

• Glass

• Wool

Conduction happens best in

• Solids

• liquids

• gases

• vacuum

Conduction and convecion cannot happen in

• solids

• liquids

• gases

• vacuum

conduction happens quickly in metals due to

• free moving elecrons

• vibrations of atoms

Which of the processes causes thermal conduction in metals and non metals?

• Movement of free electrons

• Movement of atoms

• thermal expansion

• lattice vibration

Why does water flow upwards when it is heated?

• The water expands, increasing its density.

• The water expands, decreasing its density.

• The water contracts, increasing its density.

• The water contracts, decreasing its density.

Why can't convection not happen in solids?

• Solids cannot expand when heated.

• Solids become denser when heated.

• Solids are more difficult to heat than liquids or gases.

• Particles in solids are in fixed positions and cannot move from place to place.