Chemical Engineering
GATE CH concept:surface-tension PYQs
Build your understanding with focused practice from past exam papers.
How to practice concept:surface-tension
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–3 of 3. Imported answers require independent review unless marked reviewed.
Question 59
Open questionCHNAT2 marksNeeds review
When a cylindrical capillary glass tube, open at both ends, is vertically inserted in a pool of water, the water level in the tube rises to 7 cm relative to the water level outside the tube. Consider that the surface tension of water is 0.07 N m⁻¹ and that the contact angle of water on glass is 0°. The density of water is 1000 kg m⁻³, and the local acceleration due to gravity is 10 m s⁻². The diameter of the capillary tube (in μm) is __________ (rounded off to the nearest integer).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 15
Open questionCHMCQ1 markNeeds review
An infinitely long cylindrical water filament of radius
is surrounded by air. Assume water and air to be static. The pressure outside the filament is
and the pressure inside is
. If
is the surface tension of the water-air interface, then
isYour answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 41
Open questionCHNAT2 marksNeeds review
Consider a tank filled with 3 immiscible liquids A, B and C at static equilibrium, as shown in the figure.
At 2 cm below the liquid A – liquid B interface, a tube is connected from the side of the tank. Both the tank and the tube are open to the atmosphere.
At the operating temperature and pressure, the specific gravities of liquids A, B and C are 1, 2 and 4, respectively. Neglect any surface tension effects in the calculations. The length of the tube
that is wetted by liquid B is ________ cm.Log in to check the answer
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