Question

Give reasons-
(a) Electric wires used for connection purpose at home have plastic covering.
(b) The two terminals of an electric cell should never be joined directly.
(c) It is unsafe to switch on a geyser with a wet hand.
5.
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Answer 1

Explanation:

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• a) Most electrical wire is covered in a rubber or plastic coating called insulation.
• The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.

• b) The electric cell has two terminals: a positive terminal and negative terminal.
• We should never join the two terminals of a cell directly by a wire because if we join the two terminals of a cell directly by wire only, then the chemicals present in the cell get used up very fast, the cell gets damaged quickly

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Answer 2

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Assertion (1) : Electric wires used for connection purpose at home have plastic covering.

Reason (1) : The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.

Assertion (2) : The two terminals of an electric cell should never be joined directly.

Reason (2) : if we join the two terminals of a cell directly by wire only, then the chemicals present in the cell get used up very fast, the cell gets damaged quickly.

Assertion (3) : It is unsafe to switch on a geyser with a wet hand.

Reason (3) : Wet body can act as a good conductor of electricity. In case of any leakage the person with wet hands will get shock.