Match List I (Quantity) with List II (Units) and select the correct answer using the codes given below the Lists: List I - List II 1. I. High speed - A) Mach 2. II. Wavelength - B) Angstrom 3. III. Pressure - C) Pascal 4. IV. Energy - D) Joule

1. The task is to match the physical Quantity (List I) with its corresponding Unit (List II). 2. I. High speed, especially of aircraft or objects moving through a fluid, is often expressed relative to the speed of sound using the Mach number. So, I matches with A. 3. II. Wavelength, particularly of light or atomic dimensions, is commonly measured in Angstroms (Å), where 1 Å = 10⁻¹⁰ meters. So, II matches with B. 4. III. Pressure is defined as force per unit area. Its SI unit is the Pascal (Pa), which is equivalent to one Newton per square meter (N/m²). So, III matches with C. 5. IV. Energy, work, and heat are measured in Joules (J) in the SI system. So, IV matches with D. 6. Combining these matches: I-A, II-B, III-C, IV-D.