Question

1-6
Periodic Assessment Test
Science
October 2020
Marks-25
Learning Outcomes
Classifies substance, living beings and the processes based on observable
properties
In the below given process, R and T indicates a process. Identify this process
and indicate the type (reversible and non reversible) by mentioning any single
change involved in this process.
P
ICE
WATER
WATER
VAPOR
STEAM
5
R​

Answer 1

All the mentioned processes are reversible.

Explanation:

• Ice is reversible.  As ice can be turned into water by melting and then again into ice by freezing hence it is reversible.

• Water: Water is also reversible. This is because ice, steam can be tuned back into water.

• Water vapor is reversible as cooling of water vapor will yield water. Then, heating the water again will result in the formation of water vapors.

• Steam is also reversible. Steam can be changes into water by cooling it and vice versa.