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Subject :NSO    Class : Class 7

A hot liquid is carefullypoured into a beaker. The graph shows how its temperature changes as it cools towards room temperature.

Which process(es) is/are taking place at region X ?

A Boiling and evaporation
B Condensation only
C Evaporation only
D Solidification and evaporation


All the latent heat of vaporization is used for condensation. So at X the T is constant

Ans 1:

Class : Class 7
There is no proper solution for this question which will make it more confusing as everyone will have different opinions in this question.

Ans 2:

Class : Class 8
Also freezing and melting point of water is 0 degrees celsius

Ans 3:

Class : Class 8
It cools towards room temperature so it does not freeze

Ans 4:

Class : Class 6
b is the correct answer

Ans 5:

Class : Class 7
Three states - gas , liquid & solid When hot water temp is going down it will be ultimate become solid ie ice But before becoming ice temp will stagnant for some time where in both states liquid & solid co-exist==> some part of liquid is in ice form. X is the same state where in solid and liquid will co-exist. Hence option 4 is correct(solidification& evaporation) Note: Could not attach gif .It would have made it more clear.

Ans 6:

Class : Class 8
why?

Ans 7:

Class : Class 7
i think b is the correct answer

Ans 8:

Class : Class 7
It is cooling towards room temperature so it does not solidify since the freezing point is below room temperature.

Ans 9:

Class : Class 7
I think B is the correct answer because there is no solidification taking place or else the water would have turned into ice. plus no solidification can take place when water is at room temperature.

Ans 10:

Class : Class 7
i think b is the correct answer

Ans 11:

Class : Class 7
B is the correct answer

Ans 12:

Class : Class 8
at 4 degree celsius water starts expanding and 'x' shows the same the room temperature might have been near or equal to the freezing point of water(eg room temperature of regions like arctic and antarctic)

Ans 13:

Class : Class 7
i think b is correct

Ans 14:

Class : Class 7
I think b is correct because there is no solidification

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