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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
- The half life of radium is about 1600 year. Of 100 gram of radium existing now
- The inductive reactance of an inductor of 1/π henry at 50 Hz frequency is
- A ball is dropped from a height of 20 cm. Ball rebounds to a height of 10cm
- When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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