Match List I (Quantity) with List II (Units) and select the correct answer using the codes given below the lists: List-I List-IIA. High speed1. MachB. Wavelength2. AngstromC. Pressure3. PascalD. Energy4. JouleCodes:
✓ Correct answer: c) A-1, B-2, C-3, D-4
ExplanationA is matched with 1: High speed is often measured in terms of the Mach number, which is a ratio of an object’s speed to the speed of sound in the surrounding medium.Mach number represents the speed of an object relative to the speed of sound in the surrounding medium.B is matched with 2: The unit used to measure the wavelength of light or electromagnetic waves is the angstrom (1 angstrom = 10^-10 meters).C is matched with 3: The unit of pressure is the Pascal (Pa), which is defined as one newton per square meter (N/m²).D is matched with 4: The unit of energy is the Joule (J).UPSC GS Paper-I PYQs 594 269
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