Question

Match the instruments in Group I with the physical quantities they measure in Group II. \[ \begin{array}{|c|c|} \hline Group I & Group II
\hline (P) \ \text{Goniophotometer} & (1) \ \text{Electromagnetic Energy at Specific Wavelengths of Light}
(Q) \ \text{Pyrheliometer} & (2) \ \text{Luminous Flux of Directed Light Sources}
(R) \ \text{Spectrophotometer} & (3) \ \text{Direct Solar Irradiance}
(S) \ \text{Forward-Looking Infrared Camera} & (4) \ \text{Temperature}
& (5) \ \text{Global Solar Radiation}
\hline \end{array} \]

• A. P-5, Q-2, R-1, S-3
• B. P-2, Q-3, R-1, S-4
• C. P-2, Q-3, R-1, S-5
• D. P-5, Q-1, R-2, S-4

Hint:

Remember: Goniophotometer → Light flux, Pyrheliometer → Solar irradiance, Spectrophotometer → Wavelength energy, FLIR Camera → Temperature.

Answer 1

The Correct Option is B

Step 1: Goniophotometer.
Measures the luminous flux of directed light sources by assessing light intensity distribution across various angles. \[\nP \Rightarrow 2\n\]

Step 2: Pyrheliometer.
Directly measures solar irradiance (beam radiation) from the sun. \[\nQ \Rightarrow 3\n\]

Step 3: Spectrophotometer.
Analyzes electromagnetic energy at specific wavelengths of light by quantifying absorption or transmission at each wavelength. \[\nR \Rightarrow 1\n\]

Step 4: Forward-Looking Infrared Camera (FLIR).
Used for thermal imaging, specifically measuring temperature. \[\nS \Rightarrow 4\n\] \[\n\boxed{P-2, \ Q-3, \ R-1, \ S-4}\n\]