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In olden days voltmeters were __________

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In olden days voltmeters were __________

(a) made of transistors

(b) made of vaccum tubes

(c) made of transformers

(d) made of diodes

I have been asked this question in homework.

The origin of the question is Advantages of Electronic Instruments in chapter Electronic Instruments of Electrical Measurements

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Correct choice is (b) made of vaccum tubes

Easy explanation: Initially, voltmeters were made of vaccum tubes. These voltmeters were known as vaccum tube voltmeters (VTVM).

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