CTET PAPER II 2018 · PYQ · Physics / Electric Circuits and Safety · medium
Which one of the following statements is not correct?
A.There is a minimum limit of current which can safely flow in the electric circuit.✓ Correct
B.There is a maximum limit of current which can safely flow in the electric circuit.
C.Fuses are inserted in electric circuits of all the buildings.
D.If the proper fuse is inserted in a circuit, it will blow off if the current is more than the safe limit.
Explanation
There is no minimum limit of current for safe flow in an electric circuit — circuits can operate safely even at very low currents. However, there is a maximum (upper) limit beyond which the wires can overheat and cause fire or damage. Fuses are safety devices designed to break the circuit when current exceeds this maximum safe limit. Statements (2), (3), and (4) are all correct, making statement (1) the incorrect one.
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