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Which of the following statements is correct?
(A) Distilled water is a good conductor of electricity.
(B) An LED glows even when a weak electric current flows through it.
(C) Only liquid solutions of salts can conduct electricity.
(D) Zinc plating is done to make the object scratch proof.
(A) Distilled water is a good conductor of electricity. False
Distilled water is pure water devoid of mineral salts and cannot conduct electricity.
(B) An LED glows even when a weak electric current flows through it. True
An LED is generally used as a tester to detect the flow of weak electric current through it. It glows for a small variation in the voltage.
(C) Only liquid solutions of salts can conduct electricity. True
Salts need to disassociate into ions in order to conduct electricity. Hence, when salts are dissolved in water they can conduct electricity.
(D) Zinc plating is done to make the object scratch proof. True
Electroplating is the process of coating a metal over another metal in order to prevent rusting and also make the object scratch proof. Zinc metal is plated over iron in order to prevent rusting and makes it scratch proof.
Thanks & Regards,
Vasantha Sivaraj,
askIITians faculty
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