science - changes around us

Class 6 - Science

Changes Around Us

Q&A
Question:

Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.

ncert-solutions-for-class-6th-science-chapter-6-changes-around-L 1.png3

Answer:

ncert-solutions-for-class-6th-science-chapter-6-changes-around-L 1.png3



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Questions and Answers


Changes Around Us - Questions
1.

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
2.

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


Answer
3.

Classify the following into slow and fast changes:
(i) Spinning of top
(ii) Formation of day and night
(iii) Formation of curd from milk
(iv) Change of season
(v) Making curd from milk by adding lemon juice.


Answer
4.

Does the size of the paper change after making an aeroplane by folding it or by cutting it?


Answer
5.

To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?


Answer
6.

Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.

ncert-solutions-for-class-6th-science-chapter-6-changes-around-L 1.png3


Answer
7.

Give two examples of slow changes.


Answer
8.

Give two examples of reversible changes.


Answer
9.

Give two examples of irreversible changes.


Answer
10.

Classify the following as slow or fast change:
(i) Bearing of heart
(ii) Change of seasons
(iii) Burning of paper
(iv) Weathering of rocks
(v) Melting of wax
(vi) Cooking of food
(vii) Burning of wax
(viii) Melting of ice cream
(ix) Curding of milk
(x) Formation of day and night


Answer
11.

Can you say deforestation is an irreversible or reversible change?


Answer
12.

Can you change the shape of a eraser after erasing?


Answer
13.

Why does a blacksmith heat the metal rim to fix it on a cart wheel?


Answer
14.

What are slow and fast changes? Give examples.


Answer
15.

What is a physical change? Explain with example.


Answer
16.

What is a chemical change? Explain with example.


Answer
17.

What happens when sugar is heated?


Answer
18.

Explain how a metal rim slightly smaller than a wooden wheel can be fixed on it.


Answer
19.

Write some changes happening in our body.


Answer
20.

You accidentally  dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?


Answer
21.

Give two examples of fast changes.


Answer
22.

Some common changes are given in Table 6.1. Which of these changes do you think can be reversed?


Answer
23.

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
24.

How does curd being set? Is this change reversible?


Answer
25.

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


Answer
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