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प्रश्न
Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.
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उत्तर
Good conductors — Mercury, copper, silver, iron.
Bad conductors — Wood, air, saw dust, plastic, wool, cardboard.
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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.
Write true or false for a given statement.
Kerosene contracts on heating.
Fill in the blank
Black and dull surfaces are ______ of heat.
A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle. Explain why ?
Why is a cement floor laid in small pieces with gaps in between?
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.
The bottom of a cooking utensil is painted black. Give the reason.
In ice cubes, the force of attraction between the water molecules is ______.
When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.
