हिंदी

Which of the following change cannot be reversed? - Science

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प्रश्न

Which of the following change cannot be reversed?

विकल्प

  • Hardening of cement

  • Freezing of ice cream

  • Opening a door

  • Melting of chocolate

MCQ

उत्तर

Hardening of cement

Explanation -

Hardening of cement is irreversible because once hardened it cannot come back to its original shape.

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

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एनसीईआरटी एक्झांप्लर Science [English] Class 6
अध्याय 6 Changes Around Us
Multiple Choice Questions | Q 2. | पृष्ठ ३२

संबंधित प्रश्न

Very Short Answer Type Question:
Can you say deforestation is an irreversible or reversible change?


Short Answer Type Question:
What is a physical change? Explain with example.


Short Answer Type Question:
What happens when sugar is heated?


Circle the odd one.


Circle the odd one.


The burning of the paper is an irreversible change.


While lighting a candle, Paheli observed the following changes.

  1. Wax was melting
  2. Candle was burning
  3. Size of the candle was reducing
  4. Melted wax was getting solidified. of the above, the changes that can be reversed are

Paheli mixed flour and water and

  1. made a dough,
  2. rolled the dough to make a chapati,
  3. baked the chapati on a pan,
  4. 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:

  1. Simba blew balloons and put them on the wall.
  2. Some of the balloons got burst.
  3. Paheli cut colourful strips of paper and put them on the wall with the help of tape.
  4. She also made some flowers by origami (paper folding) to decorate the house.
  5. Her father made dough balls.
    Mother rolled the dough balls to make puries.
  6. Mother heated oil in a pan.
  7. 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.

 

Find the odd one out and give reason for your choice.


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