हिंदी

Look at the figure which shows three situations. Which of these shows a reversible change and why?

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प्रश्न

Look at the figure which shows three situations.

Which of these shows a reversible change and why?

विकल्प

  • A burning candle

  • An extinguished candle

  • Melting wax

MCQ
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उत्तर

Melting wax


Explanation:

Melted wax can be changed into its solid or viscous state on cooling. Therefore, it is a reversible change.

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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 6: Changes Around Us - Very Short Answer Questions [पृष्ठ ३४]

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एनसीईआरटी एक्झांप्लर Science Exemplar [English] Class 6
अध्याय 6 Changes Around Us
Very Short Answer Questions | Q 8. | पृष्ठ ३४

संबंधित प्रश्न

An example for reversible change is


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


Water on ______ changes to ice and on ______ comes back to water.


Pick the change that can be reversed from the following.


Give one example of change which occurs on heating but cannot be reversed.


Give one example of change which occurs on cooling but can be reversed.


Give one example of change which occurs on mixing two substances, but cannot be reversed.


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.


Choose the odd one out. Give reason for your choice.


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