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Why only Beckmann or fixed zero thermometer are used to note down the temperature reading?

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Why only Beckmann or fixed zero thermometer are used to note down the temperature reading?

(a) Since they can read temperature difference upto 1/100th of a degree

(b) Since they have a high mercury level

(c) Since they give a precise value of the temperature

(d) Since they give accurate readings when dissolved in water

I have been asked this question in an interview.

This is a very interesting question from Determination of Calorific Value of Solid and Non-Volatile Liquid Fuels topic in division Fuels and Combustion of Engineering Chemistry II

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Correct choice is (a) Since they can read temperature difference upto 1/100th of a degree

The best explanation: When the current is supplied from a 6 volt battery, then there is a rise in temperature, due to which some temperature change occurs which is very small, so to calculate a perfect value for this temperature change Beckmann thermometer is used.

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