Discussion
Match the following items of Column I with the corresponding items of Column II:
| Column I | Column II |
|---|---|
| P. Cetane number | 1. Beam radiation |
| Q. Pyrheliometer | 2. Anti-knock quality |
| R. Octane number | 3. Total solar radiation |
| S. Pyranometer | 4. Ignition quality |
Answer: B
The match is P-4, Q-1, R-2, S-3.
- Cetane number measures the ignition quality of diesel fuel.
- A pyrheliometer, pointed at the sun through a narrow tube, measures direct beam radiation.
- Octane number measures the anti-knock quality of petrol.
- A pyranometer, open to the whole sky, measures total (global) solar radiation.
The other options swap the cetane and octane numbers or the two radiometers.
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