Physics

Question 1

1Water is a poor conductor of heat. This can be shown by

Medium

A. freezing it B. shining light on it C. boiling water at the top of a tube while ice at the bottom stays frozen D. heating a metal rod

Question 2

2A fireman's suit is shiny on the outside to

Easy

A. cause convection B. reflect radiant heat C. absorb heat D. conduct heat away

Question 3

3A vacuum flask reduces heat loss by conduction and convection mainly by

Easy

A. the vacuum between the double walls B. the silvered surfaces C. the cork stopper only D. the plastic case

Question 4

4The heating element of an electric kettle is placed at the bottom so that

Easy

A. convection currents heat all the water B. radiation is reduced C. it is safer D. it uses less power

Question 5

5Heat transfer through a vacuum takes place by ___.

Easy

Your answer (fill in the blank)

Question 6

6Radiation is the transfer of heat

Easy

A. by electromagnetic (infrared) waves B. by sound C. through particles touching D. by fluid currents

Question 7

7Metals are good conductors of heat because they have

Easy

A. large atoms B. high densities C. no electrons D. free electrons

Question 8

8The movement of warm fluid upwards and cool fluid downwards is called a ___ current.

Easy

Your answer (fill in the blank)

Question 9

9The greenhouse effect in a glasshouse occurs because glass

Hard

A. lets short-wave radiation in but traps long-wave infrared B. conducts heat very well C. blocks all radiation D. reflects all light

Question 10

10The thermal conductivity of a material is a measure of

Medium

A. how well it conducts heat B. its melting point C. its density D. its colour