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प्रश्न
Fill in the blank
Black and dull surfaces are ______ of heat.
उत्तर
Black and dull surfaces are good absorbers of heat.
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संबंधित प्रश्न
Write true or false for a given statement.
A mercury thermometer makes use of the property of the expansion of liquids on heating.
Name the instrument used to measure the temperature of a body.
Iron rims are heated before they are fixed on the wooden wheels. Explain the reason.
Describe one experiment to show that liquids expand on heating.
Describe an experiment to show that air expands on heating.
State which expands more, when heated to the same temperature : solid, liquid or gas ?
What are the good and bad conductors of heat ? Give two examples of each.
Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.
Explain why the water pipes are covered with cotton during very cold weather.
______ is the only matter on the Earth that can be found naturally in all three states.
