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AP EAMCET2003PhysicsThermal Properties of Matter

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

Options

  1. ABoth A and B are true
  2. BBoth A and B are false
  3. CA is true but B is false
  4. DA is false but B is true

Correct answer

D. A is false but B 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 ~K ). True - Thermopiles are very sensitive and can detect extremely small temperature differences, even as low as (10⁻⁵ ~K ).

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