हिंदी

An iron ring is heated. Which of the following statement about it is incorrect? - Science

प्रश्न

An iron ring is heated. Which of the following statement about it is incorrect?

विकल्प

The ring expands.
The ring almost comes to the same size on cooling.
The change in this case is reversed.
The ring changes its shape and the change cannot be reversed.

MCQ

उत्तर

The ring changes its shape and the change cannot be reversed.

Explanation:

The ring expands on heating and comes back to its original size on cooling. The change is reversible.

shaalaa.com

Classification of Change: Reversible and Irreversible Changes

क्या इस प्रश्न या उत्तर में कोई त्रुटि है?

Q 3.Q 2.Q 4.

अध्याय 6: Changes Around Us - Multiple Choice Questions [पृष्ठ ३२]

APPEARS IN

एनसीईआरटी एक्झांप्लर Science [English] Class 6

अध्याय 6 Changes Around Us
Multiple Choice Questions | Q 3. | पृष्ठ ३२

संबंधित प्रश्न

Very Short Answer Type Question:
Give two examples of reversible changes.

Very Short Answer Type Question:
Some common changes are given in the below Table. Which of these changes do you think can be reversed?

Change	Can be reversed
(i) Raw egg to boiled egg	Yes/No
(ii) Batter to idli
(iii) Wet clothes to dirty clothes
(iv) Woollen yarn to knitted sweater
(v) Grain to its flour
(vi) Cold milk to hot milk
(vii) straight string to a cold string
(viii) Bud to flower
(ix) Milk to paneer
(x) Cow dung to biogas
(xi) stretched rubber band to its normal size
(xii) Melting of ice-cream

Match the following.

Bud to flower	Dr. A.P.J. Abdul Kalam
Reversible change	Recyclable waste
India 2020	Organic waste
Paper	Melting of ice
Vegetables	Irreversible change

Formation of curd from milk is

What are reversible changes?

Differences between

reversible and irreversible changes are:

Can we reverse the following change? If yes, suggest the name of the method.

Ice into water

Conversion of ice into water and water into ice is an example of change which can be reversed. Give four more examples where you can say that the changes can be reversed.

Paheli mixed flour and water and

made a dough,
rolled the dough to make a chapati,
baked the chapati on a pan,
dried the chapati and ground it in a grinder to make powder.

Identify the changes (i) to (iv) as the changes that can be reversed or that cannot be reversed.

lt was Paheli’s birthday, her brother Simba was helping her to decorate the house for the birthday party and their parents were also busy making other arrangements. Following were the activities going on at Paheli’s home:

Simba blew balloons and put them on the wall.
Some of the balloons got burst.
Paheli cut colourful strips of paper and put them on the wall with the help of tape.
She also made some flowers by origami (paper folding) to decorate the house.
Her father made dough balls.
Mother rolled the dough balls to make puries.
Mother heated oil in a pan.
Father fried the puries in hot oil.

Identify the activities at Paheli’s home as those that can be reversed and those which cannot be reversed.