Q. The instrument used for measuring dust in air?

A
Konimeter
B
Interferometer
C
Hypsometer
D
Manometer
Solution:

Konimeter – Instrument for measuring the amount of dust in air
interferometer – Instrument used in science and industry to measure small displacements, refractive index changes and surface irregularities.
Manometer – Instrument for measuring pressure of a fluid
Hypsometer – Instrument for measuring heights /altitudes

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