Changes around us — task. Physics CBSE Live product, Class 7 (2026-27).

Choose the correct answer:

1. A family stores vegetable peels in two different ways.
Basket A: Left in the kitchen for several days.
Basket B: Placed inside a compost pit.
Which statement best explains the difference?

Both changes are desirable because decomposition always produces compost.
The same decomposition process can be undesirable in one situation but desirable in another.
Compost formation is a physical change.
Both changes are undesirable because decomposition always causes bad smell.

2. A student wants to choose a set of changes in which the original substance or object can be obtained again. Which option should the student select?

Melting ice and boiling water
Burning a candle and rusting iron
Chopping vegetables and boiling water
Chopping vegetables and making popcorn

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2. Changes around us

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