Advertisements
Advertisements
प्रश्न
Why does a piece of ice when touched with a hand, appear cool? Explain.
Advertisements
उत्तर
On touching a piece of ice, heat flows from our hand (hot body) to the ice (cold body), and hence, it appears cold.
APPEARS IN
संबंधित प्रश्न
Write down the temperature of upper fixed point,, on the Fahrenheit scale.
Name two substances which contract on heating.
What do you mean by heat?
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?
One litre of water at 30o C is mixed with one litre of water at 50o C. The temperature of the mixture will be
Assertion: Temperature is the measure of heat energy.
Reason: Energy is the capacity to do work.
Give reasons why –
gaps are left between railway tracks
Give reasons why –
chimneys are located high up in kitchens and factories
What is the minimum possible temperature? Is there also a maximum possible temperature?
