HEAT

Which of the following is the main source of heat energy?
1. The sun
2. Nuckear reaction
3. Electricity
4. Burning of fossil fuels
The temperature of a substance is
1. the amount of heat in the substance
2. the degree of hotness or coldness of the substance
3. the amount of matter in the substance
4. the amount of energy in the substance
When heat energy is removed from an object, its temperature will
1. fall then rise
2. rise then fall
3. fall
4. stay the same
Which of the following is the best heat insulator?
1. Wood
2. Plastic
3. Glass
4. Copper
Which of the following is not the daily application of a change in state of matter?
1. Ice is used to make cold drinks.
2. Drying clothes under the hot sun
3. Ice skating
4. Use of a bimetallic strip in a firm alarm
The figure shows the gaps between the ends of rail tracks.

The gap in railway tracks is to
1. allow contraction on cold days
2. allow expansion on hot days
3. allow expansion on cold days
4. stop the transferring of heat from one rail to another.
Diagram 11 shows the effect of heat on two bimetallic strips.

Which sequence shows the rate of expansion of metals of the bimetallic strips in an increasing order?
1. P, Q, R
2. Q, R, P
3. Q, P, R
4. R, Q, P
Diagram 12 shows a cup of hot coffee on a table.

After a fe minutes, the coffee in the cup cools down. This is because heat is lost through
1. conduction and convection only
2. radiation only
3. convection only
4. conduction, convection and radiation
Buildings in tropical countries are usually painted white to
1. radiate heat
2. conduct heat
3. absorb heat
4. reflect heat
Metal pots are usually shiny and not dull, black to reduce heat loss by
1. conduction
2. convection
3. radiation
4. reflection

HEAT

Quiz