Which of the following is not a second order instrument ? – McqOptions

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1.	Which of the following is not a second order instrument ?
A.	Mercury in glass thermometer with covering.
B.	Bare mercury in glass thermometer.
C.	Pressure gauge with one bellow, two tubes and a tank.
D.	None of these.
Answer» C. Pressure gauge with one bellow, two tubes and a tank.

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