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NCERT Solution Class 6 Science Chapter – 6 Changes Around Us
NCERT solutions of class 6 science Chapter 6 Changes Around Us is provided here with a set of some additional important question like Multiple choice questions and very short answer type questions. In this solutions all the questions are explained in simple words so that the students can understand it better without any difficulty.
TEXTUAL QUESTIONS
Question 1.
To walk through a water logged area, you usually shorten the length of your dress by folding it. Can this change be reversed ?
Answer.
We can change the length of dress again. So, this change 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, a broken toy cannot be joined again ie. 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.
|
S. No. |
Change |
Can be reversed (Yes/No) |
| (i) (ii) (iii) (iv) (v) (vi) | The sawing of a piece of wood. The melting of ice candy. Dissolving sugar in water. The cooking of food. The ripening of a mango. Souring of milk. |
Answer.
S. No. | Change | Can be reversed (Yes/No) |
| (i) (ii) (iii) (iv) (v) (vi) | The sawing of a piece of wood. The melting of ice candy. Dissolving sugar in water. The cooking of food. The ripening of a mango. Souring of milk. | No Yes Yes No No No |
Question 4.
A drawing sheet changes when you draw a picture on it. Can you reverse this change ?
Answer.
No, we cannot reverse this change.
Question 5.
Give examples to explain the difference between changes that can or cannot be reversed.
Answer.
|
Reversible
Change |
Irreversible
Change |
|
(i) After this change, the substances get
their original form and no new substances are being formed.
For example : Water on cooling takes the shape of ice and
melts again to give water.
|
After this change substances do not regain
their original form and new substances are formed.
For example: Burning of paper. On burning, smoke and ashes are produced which can not be reversed to original form |
Question 6.
A thick coating of a 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, once the POP hardens, it cannot be changed to powder form.
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 that the changes, which have occurred in the cement, could be reversed ?
Answer.
No, the wet cement becomes hard on placing in the sun and cannot be changed to original powdered form.
Additional Important Questions
✳ Very Short Answer Type Questions
Question 1.
What is meant by a 'Change' ? Give examples.
Answer.
The conversion of shape and properties of a substance is called a change.
Examples :- Growth of nails and hair ripening of crops in fields, and falling of leaves.
Question 2.
Write examples of reversible changes.
Answer.
(i) Sweater knitted of wool.
(ii) Coil of wire.
Question 3.
What type of change is getting older of human being ?
Answer.
Irreversible change.
Question 4.
What is a reversible change ?
Answer.
The changes which can be reversed into its original form.
Question 5.
Write two examples of irreversible changes.
Answer.
(i) Preparing compost from dried leaves.
(ii) Preparing biogas using cow's dung.
Question 6.
Give an example of a change in which energy is absorbed.
Answer.
Green plants absorb energy to prepare.
Question 7.
Which type of change is melting of ice ?
Answer.
Reversible change.
Question 8.
Which types of change is heating wax ?
Answer.
Reversible change.
Question 9.
Which type of change is burning of a candle ?
Answer.
Irreversible change.
Question 10.
State whether energy is absorbed or released on burning of candle.
Answer.
Energy is released on burning a candle.
Question 11.
Which types of change is dissolving salt in water ?
Answer.
Reversible change
Question 12
State a few examples for slow changes.
Answer:
i) Growth of plant.
ii) Formation of rust on Iron.
iii) Ripening of fruits.
NCERT Solutions for Class 6 Science – All Chapters
Chapter 6 Changes Around Us
Chapter 7 Getting to Know Plants
Chapter 8 Body Movements
Chapter 9 The Living Organisms and Their Surroundings
Chapter 10 Motion and Measurement of Distances
Chapter 11 Light Shadows and Reflection
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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