Properties of Matter
Q. The phenomenon of liquid rising in a narrow tube is known as?
A.
Surface tension
B.
Capillarity
C.
Viscosity
D.
Hydrostatic pressure
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Solution
The phenomenon of liquid rising in a narrow tube is called capillarity.
Correct Answer: B — Capillarity
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Q. The shape of a soap bubble is spherical because:
A.
It minimizes volume
B.
It maximizes surface area
C.
It minimizes surface area for a given volume
D.
It is the only stable shape
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Solution
A soap bubble adopts a spherical shape because it minimizes the surface area for a given volume, which is energetically favorable due to surface tension.
Correct Answer: C — It minimizes surface area for a given volume
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Q. The surface tension of a liquid can be measured using which of the following methods?
A.
Barometer method
B.
Capillary rise method
C.
Hydrometer method
D.
Manometer method
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Solution
The capillary rise method is commonly used to measure surface tension by observing the height to which a liquid rises in a capillary tube.
Correct Answer: B — Capillary rise method
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Q. What does the term 'surface tension' refer to?
A.
Force per unit area
B.
Energy required to increase surface area
C.
Weight of a fluid
D.
Density of a liquid
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Solution
Surface tension is the energy required to increase the surface area of a liquid due to intermolecular forces.
Correct Answer: B — Energy required to increase surface area
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Q. What effect does adding salt to water have on its viscosity?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Varies with concentration
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Solution
Adding salt to water generally increases its viscosity.
Correct Answer: A — Increases viscosity
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Q. What happens to the density of a gas when it is compressed at constant temperature?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
According to the ideal gas law, compressing a gas at constant temperature increases its density.
Correct Answer: A — Increases
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Q. What happens to the pressure in a fluid as depth increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies randomly
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Solution
In a fluid at rest, pressure increases with depth due to the weight of the fluid above.
Correct Answer: A — Increases
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Q. What happens to the surface tension of a liquid when a surfactant is added?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Surfactants lower the surface tension of liquids by disrupting cohesive forces between molecules.
Correct Answer: B — Decreases
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Q. What happens to the surface tension of water as temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
The surface tension of water decreases as temperature increases.
Correct Answer: B — Decreases
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Q. What happens to the surface tension of water when a small amount of soap is added?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Adding soap decreases the surface tension of water because soap molecules disrupt the cohesive forces between water molecules.
Correct Answer: B — Decreases
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Q. What happens to the surface tension of water when a surfactant is added?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Adding a surfactant decreases the surface tension of water by disrupting the cohesive forces between water molecules.
Correct Answer: B — Decreases
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Q. What happens to the surface tension of water when soap is added?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Adding soap to water decreases its surface tension because soap molecules disrupt the cohesive forces between water molecules.
Correct Answer: B — Decreases
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Q. What happens to the surface tension of water when temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
The surface tension of water decreases with an increase in temperature.
Correct Answer: B — Decreases
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Q. What happens to the viscosity of a gas as temperature increases?
A.
Viscosity decreases
B.
Viscosity increases
C.
Viscosity remains constant
D.
Viscosity fluctuates
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Solution
For gases, viscosity increases with an increase in temperature due to increased molecular activity and collisions.
Correct Answer: B — Viscosity increases
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Q. What happens to the viscosity of a liquid as temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies unpredictably
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Solution
As temperature increases, the viscosity of a liquid generally decreases because the increased thermal energy allows the molecules to move more freely.
Correct Answer: B — Decreases
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Q. What happens to the viscosity of gases with an increase in temperature?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies randomly
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Solution
The viscosity of gases increases with an increase in temperature due to increased molecular motion.
Correct Answer: A — Increases
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Q. What happens to the Young's modulus of a material as temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
Generally, the Young's modulus of materials decreases with an increase in temperature.
Correct Answer: B — Decreases
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Q. What happens to the Young's modulus of a material when it is heated?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
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Solution
Generally, the Young's modulus of a material decreases when it is heated due to increased atomic vibrations.
Correct Answer: B — It decreases
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Q. What is Poisson's ratio?
A.
Lateral strain/Longitudinal strain
B.
Longitudinal strain/Lateral strain
C.
Stress/Strain
D.
Strain/Stress
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Solution
Poisson's ratio (ν) is defined as the ratio of lateral strain to longitudinal strain.
Correct Answer: A — Lateral strain/Longitudinal strain
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Q. What is surface tension?
A.
Force per unit length
B.
Energy per unit area
C.
Pressure difference
D.
Viscosity of a liquid
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Solution
Surface tension is defined as the force acting along the surface of a liquid per unit length.
Correct Answer: A — Force per unit length
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Q. What is the bulk modulus of a material?
A.
Resistance to shear deformation
B.
Resistance to volume change
C.
Resistance to bending
D.
Resistance to tensile stress
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Solution
The bulk modulus measures a material's resistance to uniform compression, indicating how much it resists volume change.
Correct Answer: B — Resistance to volume change
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Q. What is the definition of Young's modulus?
A.
The ratio of tensile stress to tensile strain
B.
The ratio of compressive stress to compressive strain
C.
The ratio of shear stress to shear strain
D.
The ratio of bulk stress to bulk strain
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Solution
Young's modulus is defined as the ratio of tensile stress to tensile strain, which measures the stiffness of a solid material.
Correct Answer: A — The ratio of tensile stress to tensile strain
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Q. What is the effect of adding a solute to a solvent on the viscosity of the solution?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on the solute
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Solution
Adding a solute to a solvent typically increases the viscosity of the solution due to the interactions between solute and solvent molecules.
Correct Answer: A — Increases viscosity
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Q. What is the effect of adding salt to water on its viscosity?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on temperature
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Solution
Adding salt to water generally increases its viscosity.
Correct Answer: A — Increases viscosity
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Q. What is the effect of increasing temperature on the density of a gas?
A.
Increases density
B.
Decreases density
C.
No effect
D.
Depends on pressure
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Solution
Increasing the temperature of a gas generally decreases its density, as the gas expands.
Correct Answer: B — Decreases density
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Q. What is the effect of increasing the molecular weight of a polymer on its viscosity?
A.
Viscosity decreases
B.
Viscosity increases
C.
Viscosity remains the same
D.
Viscosity becomes unpredictable
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Solution
Increasing the molecular weight of a polymer generally leads to an increase in viscosity due to longer chain lengths and entanglements.
Correct Answer: B — Viscosity increases
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Q. What is the effect of pressure on the viscosity of gases?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on temperature
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Solution
The viscosity of gases increases with an increase in pressure.
Correct Answer: A — Increases viscosity
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Q. What is the effect of pressure on the viscosity of liquids?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on the temperature
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Solution
For most liquids, increasing pressure tends to increase viscosity, although the effect is generally small.
Correct Answer: A — Increases viscosity
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Q. What is the effect of surfactants on the surface tension of water?
A.
Increase surface tension
B.
Decrease surface tension
C.
No effect
D.
Double the surface tension
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Solution
Surfactants decrease the surface tension of water.
Correct Answer: B — Decrease surface tension
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Q. What is the effect of temperature on the surface tension of a liquid?
A.
Surface tension increases with temperature
B.
Surface tension decreases with temperature
C.
Surface tension remains constant with temperature
D.
Surface tension is independent of the nature of the liquid
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Solution
As temperature increases, the kinetic energy of the molecules increases, leading to a decrease in cohesive forces and thus a decrease in surface tension.
Correct Answer: B — Surface tension decreases with temperature
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