Q23.There is an air bubble of radius 1. 0 mm in a liquid of surface tension 0. 075 N m–1 and density 1000 kg m–3 at a depth of 10 cm below the free surface. The amount by which the pressure inside the bubble is greater than the atmospheric pressure is _______ Pa(g = 10 m s−2).
What This Question Tests
This question combines the concepts of excess pressure due to surface tension in a bubble with the hydrostatic pressure at a certain depth in a liquid.
Concepts Tested
Formulas Used
ΔP = 2T/R
P_gauge = ρgh
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9.3 A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.63 up to the same height, by what distance would the microscope have to be moved to focus on the needle again?
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1.36 100 g of liquid A (molar mass 140 g mol–1) was dissolved in 1000 g of liquid B (molar mass 180 g mol–1). The vapour pressure of pure liquid B was found to be 500 torr. Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure of the solution is 475 Torr. 29 Solutions Reprint 2025-26
📋 Question Details
- Chapter
- Properties of Matter
- Topic
- Pressure in fluids and surface tension
- Year
- 2023
- Shift
- 15 Apr Shift 1
- Q Number
- Q23
- Type
- Numerical
- NCERT Ref
- Class 11 Physics Ch 10: Mechanical Properties of Fluids
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