6 public questions tagged with this topic.
Liquids and gases are fluids that can flow and take the shape of their container due to their inability to maintain a fixed shape, unlike solids, which have a definite shape due to strong intermolecular forces resisting deformation.
Ref: NCBI Bookshelf, Ideal Gas Law: P1V1/T1 = P2V2/T2.
Fluids cannot resist shear stress without flowing due to their lack of rigidity; solids, not fluids, resist shear stress with a fixed shape. The incorrect statement is that fluids resist shear stress like solids.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
Surface tension minimizes surface energy by reducing surface area. For a given volume, a sphere has the smallest surface area, making it the preferred shape for liquid drops when gravity or other forces are negligible.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
Surface tension creates a “skin-like” effect at the water’s surface, supporting the insect’s weight if the force per unit length (S) exceeds the downward force distributed over its contact area, due to its small size and light weight.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
h = 2Scosθρga. S = 0.0727N/m, ρ = 1000kg/m3, g = 10m/s2, a = 0.55×10−3m. h = 2×0.0727×11000×10×0.55×10−3 = 0.02645m = 2.645cm. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 2.7 cm. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
Gases have weaker intermolecular forces and larger intermolecular spaces compared to liquids, allowing them to compress significantly under pressure, while liquids’ strong forces resist volume changes. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Weaker intermolecular forces. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
Ref: NCBI Bookshelf, Ideal Gas Law: P1V1/T1 = P2V2/T2.
