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प्रश्न
State whether the following statement is true or false. If false write the correct statement.
Desirable changes are meaningful, while undesirable changes are unfavourable.
विकल्प
True
False
उत्तर
True
APPEARS IN
संबंधित प्रश्न
For any substance, why does the temperature remain constant during the change of state?
Convert the following temperature to the celsius scale.
470 K
Name one property which is shown by ammonium chloride but not by sodium chloride.
Fill in the following blank with suitable words :
Gases can be liquefied by applying ....................... and lowering .....................
Fill in the following blank with suitable words :
Scientists say that there are actually five states of matter : solid, liquid, gas, .................... and ...................
Which contains more heat, 1 kg of water at 100° C or 1 kg of steam at 100° C ? Give reason for your answer.
How does applying pressure (or compression) help in the liquefaction of a gas ?
Define the term 'latent heat of fusion' of a solid. How much is the latent heat of fusion of ice ?
If the temperature of an object is 268 K, it will be equivalent to :
Which one of the following set of phenomena would increase on raising the temperature ?
When water is heated to a temperature x, it gets converted into steam at temperature x by a process called R. And when steam at temperature x is cooled, it gets reconverted into water at the same temperature x by a process called S.
- How much is the value of x in Kelvin ?
- What is the process R called ?
- What is the name of the energy absorbed during the process R ?
- What is process S known as ?
- What is the name of energy released during the process S known as ?\\
Define the following terms: Diffusion
Differentiate between: Melting and boiling
Water cycle is an example of interconversion of states of water. Explain
Write whether the following statement is true or false:
There is no difference between evaporation and boiling
The process by which a solid changes into a liquid is called
What will happen if....? And why?
A bell is made of wood.
Matter in any state is composed of small particles – molecules, atoms, or ions. Differentiate the terms above in Italics.
Give the reason for the following:
The kinetic energy of molecules of gases is very large & of solids, the least.
