Home › JEE Main › Physics › Mechanical Properties of Solids and Fluids › Velocity of efflux from small hole at depth h be…
Velocity of efflux from small hole at depth h below free surface (Torricelli's law):
Av = gh
Bv = sqrt(2gh)
Cv = 2gh
Dv = sqrt(gh)
Answer & Solution
Correct answer: B. v = sqrt(2gh)
From Bernoulli (P_atm both sides, neglect surface motion): (1/2)v² = gh → v = sqrt(2gh). Same speed as free fall from height h.
Related questions
Compressibility (1/B) of water at standard conditions:Find Y if a wire of length 4 m, area 0.1 mm² stretches 0.5 mm under 5 kg load (g = 10):For frictionless liquid flow in horizontal tube of varying cross-section, where is pressurFor dynamic surface tension in oil drop slowly forming at tip of pipette, drop falls when:For thin spherical shell of water (radius R, thickness t), volume of water:Pressure at depth h in liquid column under atmospheric pressure P₀:For ideal fluid, viscosity:For elastic potential energy in stretched wire: F × ΔL / 2. Also equals: