Heat PHYSICS - Heat

Name the substance which is most non-conducting.

Name the metal which is most conducting.

Out of metals, liquids, and gases:
Which one is worst conductor of heat?

Out of metals, liquids, and gases:
Which one is the best conductor of heat?

Are liquids good conductors of heat?

What are the expected effects of global warming?

What are greenhouse gases?

Describe an experiment to show that a blackened surface is a better emitter of heat than a polished surface.

Draw a labeled diagram of a vacuum flask and explain how the heat transfer minimized in it.

The following figure shows a container in which a lighted candle has been kept. The container has two openings, p, and Q. Which way the smoke from an external source placed near P moves when it reaches P and leaves from Q. Give a reason for your answer.

The following figure shows a rectangular box with two tubes P and Q at the top. A burning candle R is placed under the tube P. The candle burns brightly.

Explain: (i) How is the air in the box circulating?
(ii) What will happen if the opening Q is closed?

Give reasons for the following:
Even when the water in the lakes is frozen, fish can survive.

Show by an experiment that the real expansion of a liquid is equal to the sum of its apparent expansion of a liquid is equal to the sum of its apparent expansion and the volume expansion of the vessel containing the liquid.

Describe an experiment to demonstrate the thermal expansion of solids.

Describe an experiment to demonstrate thermal expansion in gases.

Distinguish between Mercury and Alcohol as a thermometric liquid.

SI unit of temperature is ______

CGS units of heat is _________

Water pipes burst in winter in very cold countries is due to ________

In a bimetal two metals of different Coefficient of _______ are used.

When ice melts its volume increase and density _______.