Advertisements
Advertisements
प्रश्न
उत्तर
Water is a bad conductor of heat
An ice cube is wrapped into a wire mesh and is put at the bottom of the glass test tube. The test tube is then heated near the top of the water. It will be noticed that though the water at the top starts boiling, the ice at the bottom does not melt. This clearly shows that water is a poor conductor of heat.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
Heat is a form of _______.
Define the term calorie. How is it related to joule (the S.I. unit of heat)?
What will absorb heat?
Steel spoon
Find the odd one out and give its explanation.
The unit of heat is
Why does the bottom of a lake not freeze in severe winter though the surface is all frozen?
______ is a form of energy.
A circular metal loop is heated at point O as shown in Figure 4.6.
(i) In which direction would heat flow in the loop?
(ii) In which order are the pins at points P, Q and R fixed with the help of wax fall if points O, P, Q and R are equidistant from each other?
On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. why?
Explain the following effects of heat.
Chemical changes