UPSC NDA 2 2022 General Ability Solved Paper

Concept:Density determines if an object sinks or floats: object floats if its density is less than the liquid's density, sinks if greater.Explanation:Given: packet volume $V = 1 \text{ L} = 1000 \text{ cm}^3$, mass $m = 800 \text{ g}$.Density of packet $\rho = \frac{m}{V} = \frac{800}{1000} = 0.8 \text{ g/cm}^3$.Density of water = $1 \text{ g/cm}^3$.Density of liquid B = $1.5 \text{ g/cm}^3$.Since $0.8 < 1$ and $0.8 < 1.5$, the packet's density is less than both liquids.Thus, the packet floats in both water and liquid B.Answer:A. The packet will float in both water and liquid B.