Question

Match the pathogens with their associated diseases:

List I	List II
A. Threadworm --- III. Strongyloidiasis B. Cryptosporidium species --- IV. Diarrhea C. Roundworm --- I. Ascariasis D. Whipworm --- II. Trichuriasis	III. Strongyloidiasis IV. Diarrhea I. Ascariasis II. Trichuriasis

• A. A-I, B-II, C-III, D-IV
• B. A-III, B-II, C-IV, D-I
• C. A-III, B-IV, C-II, D-I
• D. A-III, B-I, C-IV, D-II

Hint:

XRD $\rightarrow$ crystal structure; ICP-OES $\rightarrow$ multi-element; UV-Vis $\rightarrow$ Beer--Lambert; Flame photometer $\rightarrow$ alkali/alkaline earth metals.

Answer 1

The Correct Option is C

Step 1: Concept
Analytical instruments and their specific applications.

Step 2: Meaning
Each analytical instrument is designed for a specific type of measurement based on its underlying physical principle.

Step 3: Analysis
X-ray Diffractometer (A): Uses Bragg's equation ($n\lambda = 2d\sin\theta$) to identify crystal structures/minerals --- matches III.
ICP-OES (B): Can simultaneously measure multiple elements by detecting their characteristic emission wavelengths from the plasma --- matches IV.
UV-Vis spectrophotometer (C): Based on Beer--Lambert law; used for colorimetric analysis --- matches II.
Flame photometer (D): Limited to alkali (Na, K, Li) and alkaline earth (Ca, Ba) metals due to low excitation energy of the flame --- matches I.

Step 4: Conclusion
Correct matching: A-III, B-IV, C-II, D-I. Final Answer: (C)