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NEET
Exam
NEET
Subject
Physics
Chapter
Thermal Properties of Matter

NEET · Physics · Thermal Properties of Matter

Consider the two following statements A and B , and identify the...

Consider the two following statements AA and BB, and identify the correct choice given in the answers : (A)(A) Duddell's thermo galvanometer is suitable to measure direct current only. (B) Thermopile can measure temperature differences of the order of 10−3∘C10^{-3}{ }^{\circ} \mathrm{C}.

Options

  1. ABoth AA and BB are true
  2. BBoth AA and BB are false
  3. CAA is true but BB is false
  4. DAA is false but BB is true

Correct answer

D. AA is false but BB is true

Step-by-step solution

(A) Duddell's thermo-galvanometer is suitable to measure direct current only. X False - It is actually designed to measure alternating current (AC) by converting it into heat and then into a DC deflection. (B) Thermopile can measure temperature differences of the order of (10^{-5} \mathrm{~K}). True - Thermopiles are very sensitive and can detect extremely small temperature differences, even as low as (10^{-5} \mathrm{~K}).
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