GK QUESTION#3104
Match each instrument in List I with its use in List II.
Read each row across both columns.
| List I (Instrument) | List II (Use) |
|---|---|
| 1. Sextant | a. Measures the angle between two visible objects |
| 2. Udometer (rain gauge) | b. Detects small quantities of radiant heat |
| 3. Thermopile | c. Measures the temperature of a surface |
| 4. Pyrometer | d. Measures the amount of rainfall |
Show Answer
Answer
B. 1 - a, 2 - d, 3 - b, 4 - c
Show Explanation
Explanation
The correct matching is 1–a,2–d,3–b,4–c. A sextant measures angles, a rain gauge or udometer measures rainfall, a thermopile detects radiant energy, and a pyrometer measures surface temperature from thermal radiation. The functions are being matched; no invention-priority claims are required.