(A) Thermo galvanometer is suitable to measure DC only
(B) Thermopile can measure temperature differences only of the order $10^{- 1}^{0} C$

Both A and B are true

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Both A and B are false

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A is true but B is false

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A is false but B is true

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Solution

The correct option is D A is false but B is true
The thermo-galvanometer is an instrument for measuring small electric currents(only alternating current). It is used on a circuit of any frequency (even up to 120,000~ per sec.) and currents as small as twenty micro-amperes can be readily measured by it.
A thermo-pile is a set of thermo-couples arranged for measuring small quantities of radiant heat.so it can measure the temperature differences of the order of $10^{- 1}^{0} C$

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(A) Thermo galvanometer is suitable to measure DC only(B) Thermopile can measure temperature differences only of the order 10−10C

(A) Thermo galvanometer is suitable to measure DC only
(B) Thermopile can measure temperature differences only of the order $10^{- 1}^{0} C$