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ICSE Class 10 Physics Question 8 of 19

Household Circuits — Question 9

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Question

Question 9

Assertion (A): A fuse wire must have a high resistance and low melting point.

Reason (R): A fuse is only used for a small current flow.

  1. Both A and R are true and R is the correct explanation of A
  2. Both A and R are true and R is not the correct explanation of A
  3. assertion is false but reason is true
  4. assertion is true but reason is false.
Answer

assertion is true but reason is false.

Explanation

Assertion (A) is true. A fuse wire must have a high resistance to generate enough heat when a high current flows through it, causing it to melt and break the circuit.

Reason (R) is false. While fuses are used for protecting electrical circuits, they are not specifically used only for small current flow. Fuses are designed to handle normal operating currents but melt and break the circuit when the current exceeds a safe level, regardless of whether it is small or large.