Paragraph: DIRECTIONS for Question No. 24: The following question consists of two statements, one labelled ‘Assertion’ (A) and the other labelled ‘Reason’ (R).
Examine these two statements carefully and decide if the Assertion and the Reason are individually true and if so, whether the Reason is a correct explanation of the Assertion.
Select your answer using the code given below: (a) If both A and R are true and R is the reason. (b) If both A and R are true and R does not explain A. (c) If A is true and R is false (d) If A is false and R is true.
PQ24. Assertion (A): The material of the wire used in electric fuses contain low melting point materials. Reason (R): A fuse is used as a safety device to prevent damages to electrical circuits when excessive electricity passes through it.
Exp: The fuse elements are made of low melting point materials, e.g. tin (Sn) or zinc (Zn) and alloys thereof. In all buildings fuses are inserted in all electrical circuits. There is a maximum limit to the current which can safely flow through a circuit. If by accident the current exceeds the safe limit, the wires may become overheated and may cause fire. If a proper fuse is there in the circuit, it will blow off and break the circuit. A fuse is thus a safety device which prevents damages to electrical circuits and possible fires.