Question:
Match the instruments in Group I with the physical quantities they measure in Group II.
\[
\begin{array}{|c|c|}
\hline
Group I & Group II
\hline
(P) \ \text{Goniophotometer} & (1) \ \text{Electromagnetic Energy at Specific Wavelengths of Light}
(Q) \ \text{Pyrheliometer} & (2) \ \text{Luminous Flux of Directed Light Sources}
(R) \ \text{Spectrophotometer} & (3) \ \text{Direct Solar Irradiance}
(S) \ \text{Forward-Looking Infrared Camera} & (4) \ \text{Temperature}
& (5) \ \text{Global Solar Radiation}
\hline
\end{array}
\]
Match the instruments in Group I with the physical quantities they measure in Group II.
\[
\begin{array}{|c|c|}
\hline
Group I & Group II
\hline (P) \ \text{Goniophotometer} & (1) \ \text{Electromagnetic Energy at Specific Wavelengths of Light}
(Q) \ \text{Pyrheliometer} & (2) \ \text{Luminous Flux of Directed Light Sources}
(R) \ \text{Spectrophotometer} & (3) \ \text{Direct Solar Irradiance}
(S) \ \text{Forward-Looking Infrared Camera} & (4) \ \text{Temperature}
& (5) \ \text{Global Solar Radiation}
\hline \end{array} \]
\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} \]
Show Hint
Remember: Goniophotometer → Light flux, Pyrheliometer → Solar irradiance, Spectrophotometer → Wavelength energy, FLIR Camera → Temperature.
Updated On: Jan 13, 2026
- P-5, Q-2, R-1, S-3
- P-2, Q-3, R-1, S-4
- P-2, Q-3, R-1, S-5
- P-5, Q-1, R-2, S-4
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Goniophotometer.
This instrument measures the luminous flux of directed light sources, checking how light intensity is distributed at different angles.
\[
P \Rightarrow 2
\]
Step 2: Pyrheliometer.
It directly measures solar irradiance (beam radiation) from the sun.
\[
Q \Rightarrow 3
\]
Step 3: Spectrophotometer.
This device measures electromagnetic energy at specific wavelengths of light, analyzing how much light is absorbed or transmitted at each wavelength.
\[
R \Rightarrow 1
\]
Step 4: Forward-Looking Infrared Camera (FLIR).
This camera is used for thermal imaging → measurement of temperature.
\[
S \Rightarrow 4
\]
\[
\boxed{P-2, \ Q-3, \ R-1, \ S-4}
\]
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