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4 Changes Around Us
1. _____ is an irreversible change.
a. Burning of coal
b. Melting of wax
c. Melting of ice
d. Formation of ice
2. Which of the following is an irreversible change:
a. A toy aeroplane made by folding paper
b. A roti
c. A balloon changes its size and shape on blowing air into it
d. Melting of wax
3. Which of the following is not an example of the changes that occur by mixing two substances?
a. Salt dissolved in water
b. Mixing sand and water
c. Sugar dissolved in water
d. Burning of a matchstick
4. A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
c. Can’t say
d. All of theabove