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Electricity — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceElectricity1 Mark
MCQ
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : Heater wire must have high resistance and high melting point.
Reason : If resistance is high, the electric conductivity will be less.
  • A
    Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
  • ✓
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true, but $R$ is false.
  • D
    $A$ is false, but $R$ is true.
✓

Answer

Correct option: B.
Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
Heater wire must have high resistance and high melting point, because in series current remains same, therefore according to Joule's law $\text{H}=\frac{\text{i}^2\text{Rt}}{4.2,}$ heat produced is high if $R$ is high. Melting point must be high, so that wire may not melt with increase in temperature.

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