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Changes Around us | Chapter 6 | Class 6 | Science | NCERT


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: Yes, the process 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: No, this change cannot 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.

Sl. No.ChangeCan Be Reversed Yes/No
1The sawing of a piece of wood
2The melting of ice candy
3Dissolving sugar in water
4The cooking of food
5The ripening of a mango
6Souring of milk

Answer :

Sl. No.ChangeCan Be Reversed Yes/No
1The sawing of a piece of woodNo
2The melting of ice candyYes
3Dissolving sugar in waterYes
4The cooking of foodNo
5The ripening of a mangoNo
6Souring of milkNo

Question 4. A drawing sheet changes when you draw a picture on it. Can you reverse this change?

Answer: This change can be reversed if a pencil is used to draw the picture. If a pen, paint, or oil/water colours are used to draw the picture, change cannot be reversed.

Question 5. Give examples to explain the difference between changes that can or cannot be reversed.

Answer: Changes that can be reversed are as given below:

i) Opening and closing the door

ii) Filling glass with water

Changes that cannot be reversed are as given below:

i) Conversion of milk into curd

ii) Ripening of fruit

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: No, the change cannot be reversed

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?

AnswerNo, the change cannot be reversed

NCERT Class 6 Science

Chapter 1: Food: Where Does It Come From?

Chapter 2: Components of Food

Chapter 3: Fibre to Fabric

Chapter 4: Sorting Materials and Groups

Chapter 5: Separation of Substances

Chapter 6: Changes Around Us

Chapter 7: Getting to Know Plants

Chapter 8: Body Movement

Chapter 9: The Living Organisms and Their Surroundings

Chapter 10: Motion and Measurement of Distances

Chapter 11: Light, Shadows and Reflections

Chapter 12: Electricity and Circuits

Chapter 13: Fun with Magnets

Chapter 14: Water

Chapter 15: Air Around Us

Chapter 16: Garbage In, Garbage Out

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