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प्रश्न
Give an example of desirable change which can also be undesirable.
उत्तर
Using a car to cover a long distance is a desirable change but car emissions can lead to air pollution which is undesirable.
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संबंधित प्रश्न
Suggest a method to liquefy atmospheric gases.
What do you observe when :
some ice cubes are kept in a glass tumbler
Tick (√) the correct alternative from the choice given for the following statement.
When you put some ice cubes in a glass, droplets of water are formed on the outer wall of the glass. This explains the phenomenon of
Dissolving salt in water is a reversible change.
Write the relation between Kelvin scale and Celsius scale of temperature.
Fill in the following blank with suitable words :
Temp on Kelvin scale = Temp on Celsius scale + ........................
How is ammonia gas liquefied ?
When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :
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: Boiling point
What happens to a metal ball when it is heated? What does this show?
Write whether the following statement is true or false:
There is no difference between evaporation and boiling
What is it made from? Why?
The sheets used for roofing.
What will happen if....? And why?
A knife is made of wood.
What will happen if....? And why?
An axe is made of rubber.
Why does this happen?
Coconut oil thickens in winter.
Select the correct answer from A, B, C, D & E for the statement given below:
The state of matter which has ___________ least density & no free surfaces.
With reference to the liquid state of matter – answer the following
On heating, the liquid, do the particles gain or lose energy.
Give the reason for the following
Solids cannot be compressed, but gases are highly compressible.
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in following case.
During the melting of solids, the inter-particles space __________.
