मराठी

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

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प्रश्न

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.

औचित्य
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उत्तर

Boojho will not be successful because making of toy from Plaster of Paris (POP) is an irreversible change. Once the Plaster of Paris is mixed with water and dried it cannot regain its properties.

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पाठ 6: Changes Around Us - Short Answer Questions [पृष्ठ ३५]

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एनसीईआरटी एक्झांप्लर Science Exemplar [English] Class 6
पाठ 6 Changes Around Us
Short Answer Questions | Q 13. | पृष्ठ ३५

संबंधित प्रश्‍न

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


Drying of wet clothes in air is an example of


When a candle is lit the following changes are observed.

  1. Wax melts.
  2. Candle keeps burning.
  3. The size of the candle decreases.
  4. The molten wax solidifies
  5. Which of the changes can be reversed? Justify your answer

What are reversible changes?


Analogy:

Irreversible change: Making idly front batter.
Reversible change: ______.


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


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


Give one example of change occurs on mixing two substances, but can be reversed.


Give one example of change which occurs on mixing two substances, but 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.


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