A manometer with ethyl alcohol (ρ\=806kg/m3) shows a height difference of 0.26m. What is the pressure difference? (Take
ΔP = ρgh. ρ = 806kg/m3, g = 9.8m/s2, h = 0.26m. ΔP = 806×9.8×0.26 = 2055.08Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 2055 Pa. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
Ref: NCBI Bookshelf, Ideal Gas Law: P1V1/T1 = P2V2/T2.