Question

Match the instruments with the parameters they measure: 
 

List-1	Instrument	List-2 (Parameter)
A	Autocollimeter	\( \text{Angular error} \)
B	Hygrometer	\( \text{Humidity} \)
C	Nephelometer	\( \text{Density} \)
D	Mass spectrometer	\( \text{Molecular weight} \)

• A. A-Q, B-S, C-T, D-R
• B. A-S, B-T, C-R, D-Q
• C. A-T, B-R, C-Q, D-S
• D. A-R, B-Q, C-S, D-T

Hint:

Autocollimeter → Angular error; Hygrometer → Humidity; Nephelometer → Density; Mass spectrometer → Molecular weight.

Answer 1

The Correct Option is A

- Autocollimeters are used to measure angular displacement → Angular error (Q)
- Hygrometers measure the moisture content in the atmosphere → Humidity (S)
- Nephelometers assess the turbidity or particle density in fluids → Density (T)
- Mass spectrometers determine the masses of particles → Molecular weight (R)