11. Which of the following is an example of an irreversible change that takes place when heat is
supplied? [1]
a) Melting of ice
b) Transformation of water into vapour
c) Burning of coal
d) The expansion of iron
12. In a burning candle, wick is an example of ________________ and melting of wax is an
example of ________________ [1]
a) Chemical & irreversible change and Physical & reversible change
b) Physical & irreversible change and chemical & irreversible change
c) Chemical & irreversible change and chemical & irreversible change
d) Chemical & reversible change and Physical & irreversible change
13. What is it called when plants give off water vapor as a waste product? [1]
a) Condensation b) evaporation c) transpiration d) none of these
14. Precipitation is... [1]
a) Any form of water that falls from a cloud to the Earth.
b) Drinkable water that collects underground
c) Water that turns to a gas.
d) None of the answers.
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Answer:
11) ans is Cooking of food is an example of an irreversible change.
12) ans is Chemical & reversible change and Physical & irreversible change
13) ans is Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves. An example of transpiration is when a plant absorbs water in its roots.
14) ans is Any form of water that falls from a cloud to the Earth.
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