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Byju's Answer
Standard X
Physics
Phase Change
Question 7Sta...
Question

Question 7

State true or false for the following:

  1. The evaporation of water is a reversible change.

  2. The melting of wax is a chemical change.

  3. Rusting iron is an irreversible change.

  4. The change of seasons in a year is a periodic change.


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Solution

  1. True

  2. False

  3. True

  4. True


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Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Digestion of food is a Q irreversible change. ( )
2. Rusting of iron is a reversible change. ( )
3. Melting of wax is a reversible change. ( )
4. Curding of milk is an irreversible change. ( )
5. Melting of ice cream is a reversible change. ( )
Q. State whether the following statements are true or false. Rewrite the false ones correctly.
(a) All irreversible changes are chemical changes.
(b) A liquid can sublime.
(c) The evaporation of water take place only at 100°C. when it is boiling.
(d) The melting of ice is a physical change.
(e) The souring of milk is a periodic change.
(f) The flowering of trees is a periodic change.
(g) Solidification and condensation are the same.
(h) The breaking of glass tumbler is a chemical change because it is irreversible.
(i) Boiling, evaporation and condensation are physical changes.
Q. Rusting of iron nail is
(a) reversible change
(b) irreversible change
(c) periodic change
(d) non-periodic change
Q. Melting of wax and heating of blade are the examples of
(a) physical change
(b) chemical change
(c) periodic change
(d) irreversible change
Q. Fill in the blanks with the correct words.
1. Melting of ice-cream is an example of a/an .................... (reversible/irreversible) change.
2. Ripening of fruits is an example of a/an .................... (reversible/irreversible) change.
3. Cooking of foood is an example of a/an .................... (reversible/irreversible) change.
4. Breaking of glass is a .................... (physical/chemical) change.
5. .................... (Heating/Cooling) causes steam to change into water.
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