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Asia: Occupations of People

Write T for t...

Question

Write T for the true statement and F for the false one. Correct the false statement(s).
1. Air is a mixture of only two gases.
2. Air contains 21% of Carbon dioxide.
3. Electric current flows only if the circuit is open.
4. Sun is a natural source of light.
5. Wood is a magnetic object.

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Solution

1. False
Air is a mixture of many gases, including nitrogen, oxygen, carbon dioxide and water vapour.

2. False
Air contains 21% nitrogen.

3. False
Electric current flows only if the circuit is closed.

4. True

5. False
Iron is a magnetic object.

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