Question

Match List-I with List-II:

Choose the correct answer from the options given below:

• (A) - (II), (B) - (I), (C) - (IV), (D) - (III)
• (A) - (II), (B) - (IV), (C) - (I), (D) - (III)
• (A) - (III), (B) - (II), (C) - (IV), (D) - (I)
• (A) - (III), (B) - (IV), (C) - (II), (D) - (I)

Hint:

Eppley = PAR (photosynthesis); Kipp = Diffused (scattered light); Pyradiometer = Total radiation; Spectrophotometer = Light wavelengths.

Answer 1

The Correct Option is B

The correct matching of instruments with their functions is as follows:
- (A) Eppley Spectral Radiometer (II - Photosynthetically Active Radiation): This instrument measures Photosynthetically Active Radiation (PAR), the portion of the solar spectrum (400–700 nm) used by plants for photosynthesis.
- (B) Kipp Radiometer (IV - Diffused radiation): Also known as a Kipp \& Zonen pyranometer, it measures diffused solar radiation, which is sunlight scattered by the atmosphere, often used in meteorological studies.
- (C) Pyradiometer (I - Both short and long wave radiation): This device measures total radiation, including both shortwave (solar) and longwave (infrared) radiation, used for studying energy balance in meteorology.
- (D) Spectrophotometer (III - Wavelength of light): This instrument analyzes the intensity of light at specific wavelengths, used in laboratories to study material properties or chemical compositions. Thus, the correct pairing is (A) - (II), (B) - (IV), (C) - (I), (D) - (III), making option (2) correct.

Answer 2

Elimination approach:
Start with the pair you are most sure of. The Eppley Spectral Radiometer is built specifically to record Photosynthetically Active Radiation, so A must pair with (II). Only options (1) and (2) keep A - (II), so options (3) and (4) can be dropped immediately.
Now look at B. A Kipp Radiometer (Kipp & Zonen pyranometer) is used to record diffused/scattered solar radiation, not "both short and long wave radiation" - so B must pair with (IV), not (I). This rules out option (1), which had assigned B - (I).
That leaves only (A) - (II), (B) - (IV), (C) - (I), (D) - (III), confirming option (2) without needing to verify C and D separately.