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A thermocouple of negligible resistance produces an e.m.f. of 40 µV/⁰C in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1 µA/div, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be
Options
(a) 0.5⁰C
(b) 1⁰C
(c) 0.1⁰C
(d) 0.25⁰C
Correct Answer:
0.25⁰C
Explanation:
I division = 1µA
Current for 1⁰C = 40µV / 10 = 4µA
1µA = 1/4 ⁰C = 0.25⁰C
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds.
- 40 g of Argon is heated from 40⁰C to 100⁰C (R=2 cal/mole). Heat absorbed at constant
- The rest energy of an electron is
- A current of 2A flows through a 2Ω resistor when connected across a battery
- A light whose frequency is equal to 6.0 x 10¹⁴ Hz is incident on a metal
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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