मराठी

A piece of iron is heated till it becomes red-hot. it then becomes soft and is beaten to a desired shape. What kind of changes are observed in this process-reversible or irreversible? - Science

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प्रश्न

A piece of iron is heated till it becomes red-hot. it then becomes soft and is beaten to a desired shape. What kind of changes are observed in this process-reversible or irreversible?

लघु उत्तर
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उत्तर

A piece of iron on heating can be beaten into desired shape. It is a reversible change because the object of desired shape can be again heated and beated to give the original shape.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 6: Changes Around Us - Very Short Answer Questions [पृष्ठ ३४]

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एनसीईआरटी एक्झांप्लर Science [English] Class 6
पाठ 6 Changes Around Us
Very Short Answer Questions | Q 9. | पृष्ठ ३४

संबंधित प्रश्‍न

Circle the odd one.


What is reversible change?


Formation of curd from milk is


The burning of the paper is an irreversible change.


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

Water vapour into water


Boojho’s sister broke a white dove, a symbol of peace, made of Plaster of Paris (POP). Boojho tried to reconstruct the toy by making a powder of the broken pieces and then making a paste by mixing water. Will he be successful in his effort? Justify your answer.


Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?


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.


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


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