দুধের ঘনত্ব নির্ধায়ক যন্ত্র-
Solution
Correct Answer: Option D
Manometer: an instrument for measuring the pressure acting on a column of fluid.
Gravimeter: an instrument for measuring the difference in the force of gravity from one place to another.
Pyrometer: an instrument for measuring high temperatures, especially in furnaces and kilns.
Lactometer: an instrument for measuring the density of milk.
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