In this section of NCERT Science Class 6 Chapter 6 Solution (Changes Around us), we provide question and answer of all questions.
In this chapter student learn and understand about Expansion, Melting, Contraction, Changes, Evaporation, Melting and Contraction. and
NCERT Class 6 Science Chapter 6 Solution
Question 1: To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Answer 1: Yes! it can be reversed.
Question 2: You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
Answer 2: No! this change can’t be reversed.
Question 3: Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
S. No. Change Can be reversed (Yes/ No)
1. The sawing of a piece of wood
2. The melting of ice candy
3. Dissolving sugar in water
4. The cooking of food
5. The ripening of a mango
6. Souring of milk
Answer 3:
1. The sawing of a piece of wood (No)
(The sawing of a piece of wood is irreversible)
2. The melting of ice candy (Yes)
(Melting of ice candy is reversible)
3. Dissolving sugar in water. (Yes)
(Dissolving sugar in water is reversible)
4. The cooking of food. (No)
(Cooking of food is irreversible)
5. The ripening of a mango. (No)
(The ripening of mango is irreversible)
6. Souring of milk. (No)
(Souring of milk is irreversible)
Question 4: A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Answer 4: No! It can’t be reversed.
Question 5: Give examples to explain the difference between changes that can or cannot be reversed.
Answer 5: Ice change into water and water can be changed into ice. This process can be reversed. But making of curd from milk , we can’t get milk from curd, so this process can’t be reversed.
Question 6: A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Answer 6: No! It is can’t be reversed. POP can’t be obtain in its powdered form after hardening.
Question 7: A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Answer 7: No! It can’t reversed. Cement can’t be obtain again its powdered form after getting wet. Cement may be hard on drying after getting wet.
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