Revision

Water in a beaker evaporates when left on a bench for a period of time.

Which three factors all affect the rate of evaporation of the water?

• wind speed, surface area, temperature

• wind speed, temperature, volume

• wind speed, surface area, volume

• surface area, temperature, volume

Why are metals better thermal conductors than other solids?

• Metals contain free electrons which help transfer the energy.

• Molecules in metals are in fixed positions.

• Molecules in metals can move freely.

• Molecules in metals vibrate faster than those in other solids.

Sound travels through air as a series of compressions and rarefactions.

Which statement correctly compares a compression with a rarefaction?

• In a compression the wavelength is longer than in a rarefaction.

• In a compression the wavelength is shorter than in a rarefaction.

• In a compression the density of the air is greater than in a rarefaction.

• In a compression the density of the air is lower than in a rarefaction.

The diagram shows a vacuum flask used to keep a liquid warm.

Which methods of heat loss are reduced by the vacuum between the silvered walls?

• conduction only

• conduction and convection only

• convection and radiation only

• convection and radiation only

Four cups A, B, C and D contain hot coffee.

Which cup keeps the coffee warm the longest?

• A

• B

• C

• D

Which row correctly describes light waves?

• A

• B

• C

• D

A student draws a diagram to illustrate the different sections of a longitudinal wave. Which labelled section is a rarefaction?

• A

• B

• C

• D

Which statement about boiling and evaporation is correct?

• Boiling requires a supply of thermal energy but evaporation does not.

• Evaporation takes place at the surface of a liquid but boiling takes place throughout the liquid.

• When water boils in a kettle, its temperature decreases.

• When water evaporates, its temperature increases.

Two square sheets of metal, P and Q, are heated to the same temperature. The metal sheets are shown.

Sheet Q is emitting more radiation than sheet P.

Which statement explains this?

• Dull black surfaces are better conductors of radiation.

• Dull black surfaces are better emitters of radiation.

• The surface area of Q is larger than that of P.

• White surfaces are better absorbers of radiation.

A water wave passes into a region where the wave travels more slowly.

As it passes into the slow region, what happens to the frequency and what happens to the wavelength of the wave?

• A

• B

• C

• D