EASY
Earn 100
Viscosity is a measure of resistance of a liquid to flow and viscosity-
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Important Questions on States of Matter: Gases and Liquids
HARD
A graph of vapour pressure and temperature for three different liquids and is shown below:
The following inferences are made:
has higher intermolecular interactions compared to
has lower intermolecular interactions compared to
has lower intermolecular interactions compared to
The correct inferences is/are:
MEDIUM
The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KCl, and at room temperature. The correct assignment of the sketches is -
MEDIUM
Based on the given figure, the number of correct statement/s is/are
A. Surface tension is the outcome of equal attractive and repulsion forces acting on the liquid molecule in bulk.
B. Surface tension is due to uneven forces acting on the molecules present on the surface.
C. The molecule in the bulk can never come to the liquid surface.
D. The molecules on the surface are responsible for vapour pressure if the system is a closed system.
MEDIUM
At the vapour pressure of is and that of acetone is A solution of in acetone has a total vapour pressure of . The false statement amongst the following is:
MEDIUM
The units of surface tension and viscosity of a liquid, respectively, are
EASY
The liquid having maximum surface tension is
EASY
The viscosity of a liquid can be decreased by
EASY
The unit of coefficient of viscosity is:
EASY
Which is true statement?
EASY
A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram
EASY
The relationship between coefficient of viscosity of a liquid and temperature can be expressed as
MEDIUM
A flask contains air, water vapour and a small amount of liquid water at a pressure of . If this flask is connected to another evacuated flask, what will be the final pressure of the gas mixture at equilibrium? Assume the temperature to be and aqueous tension at .
MEDIUM
A frame made of metallic wire enclosing a surface area is covered with a soap film. If the area of the frame of metallic wire is reduced by 50% , the energy of the soap film will be changed by
MEDIUM
Which is not a surface phenomenon?
EASY
The velocity of water near the surface of the river is , whereas the depth is . The coefficient of viscosity of water is unit , then, shearing stress will be
MEDIUM
When a body falls in air, the resistance of air depends to a great extent on the shape of the body. different shapes are given. Identify the combination of air resistances which truly represents the physical situation (The cross-sectional areas are the same)
EASY
Surface tension vanishes at
HARD
Which one of the following is the correct statement?
MEDIUM
A mosquito with 8 legs stands on water surface and each leg makes depression of radius . If the surface tension and angle of contact are and zero respectively then the weight of mosquito is -
EASY
A liquid is flowing in a horizontal uniform capillary tube under a constant pressure difference P. The value of pressure for which the rate of flow of the liquid is doubled when the radius and length both are doubled is.
