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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.
Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.
Fill in the blank
Metals are _______ of heat.
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Black and dull surfaces are ______ of heat.
What do you understand by thermal expansion of a substance ?
What are the good and bad conductors of heat ? Give two examples of each.
In summer, ice is kept wrapped in a gunny bag. Explain the reason.
Explain why the water pipes are covered with cotton during very cold weather.
Why is a ventilator provided in a room?
______ is the only matter on the Earth that can be found naturally in all three states.
When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.
