Why is it necessary to connect an earth wire to electrical appliances having metalli covers?

How does the use of fuse wire save the electrical appliances?

Why is it necessary to have standard units of measurement ?

Give an example of a metal which used in electrical appliances.

Why is it necessary to have a wide variety of plants in a forest?

Why copper is used to make connecting wires ?

Why is it necessary to have 'selectable marker'in a cloning vector?

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : Electric appliances with metallic body e.g., heater,s presses etc, have three pin connections, whereas an electric bulb has two pin connection. Reason : Three pin connections reduce heating of connecting cables.