Question 4.

(i) What are periodic changes? Explain with examples.

(ii) Is a forest fire a periodic or a non-periodic change?

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Solution

(i) A change that is repeated after regular intervals of time is called a periodic change. Examples: Swinging of a pendulum, rising and setting of the sun at a given place.

(ii) A forest fire is a nonperiodic change.

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What are periodic and non-periodic changes? Explain with examples. Is a forest fire a periodic or a non-periodic change? [5 MARKS]

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(i) Natural and Manmade change

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Question 9:
Define the following terms:

(i) Non-Periodic change

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(iv) Fast change

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