Properties of Matter
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 increasing the temperature on the density of most liquids?
A.
Increases density
B.
Decreases density
C.
No effect
D.
Depends on the liquid
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Solution
For most liquids, increasing the temperature decreases the density as the liquid expands.
Correct Answer: B — Decreases density
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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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Q. What is the effect of temperature on the surface tension of water?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies unpredictably
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Solution
Surface tension decreases with an increase in temperature due to increased molecular motion.
Correct Answer: B — Decreases with temperature
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Q. What is the effect of temperature on the viscosity of liquids?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies randomly
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Solution
For most liquids, viscosity decreases with an increase in temperature due to increased molecular motion.
Correct Answer: B — Decreases with temperature
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Q. What is the formula for the modulus of resilience?
A.
U = 1/2 * σ * ε
B.
U = σ * ε
C.
U = 1/2 * ε^2
D.
U = σ^2 / 2
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Solution
The modulus of resilience is given by U = 1/2 * σ * ε, where σ is the yield stress and ε is the yield strain.
Correct Answer: A — U = 1/2 * σ * ε
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Q. What is the formula for Young's modulus?
A.
Stress/Strain
B.
Strain/Stress
C.
Force/Area
D.
Area/Force
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Solution
Young's modulus (E) is defined as the ratio of stress to strain.
Correct Answer: A — Stress/Strain
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Q. What is the primary cause of buoyancy in fluids?
A.
Surface tension
B.
Pressure difference
C.
Viscosity
D.
Density
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Solution
Buoyancy is primarily caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer: B — Pressure difference
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Q. What is the primary cause of capillary action in liquids?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
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Solution
Capillary action is primarily caused by adhesion, where the liquid molecules are attracted to the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of surface tension in liquids?
A.
Cohesive forces
B.
Adhesive forces
C.
Gravitational forces
D.
Electromagnetic forces
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Solution
Surface tension is primarily caused by cohesive forces between liquid molecules, which create a 'skin' at the surface.
Correct Answer: A — Cohesive forces
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Q. What is the primary cause of the phenomenon known as capillarity?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
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Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of the phenomenon of buoyancy?
A.
Surface tension
B.
Pressure difference
C.
Viscosity
D.
Density
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Solution
Buoyancy is caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer: B — Pressure difference
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Q. What is the primary cause of the phenomenon of capillarity?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
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Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of viscosity in fluids?
A.
Molecular interactions
B.
Temperature
C.
Pressure
D.
Density
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Solution
Viscosity arises primarily from molecular interactions within the fluid, which resist flow.
Correct Answer: A — Molecular interactions
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Q. What is the primary factor that affects the viscosity of a gas?
A.
Temperature
B.
Pressure
C.
Density
D.
Molecular weight
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Solution
The viscosity of a gas is primarily affected by temperature; as temperature increases, viscosity also increases.
Correct Answer: A — Temperature
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Q. What is the primary factor that determines the viscosity of a fluid?
A.
Temperature
B.
Pressure
C.
Density
D.
Molecular size
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Solution
Viscosity is primarily affected by temperature; as temperature increases, viscosity generally decreases.
Correct Answer: A — Temperature
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Q. What is the primary reason for the formation of droplets of water on a leaf?
A.
Cohesion
B.
Adhesion
C.
Surface tension
D.
Gravity
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Solution
The formation of droplets is primarily due to surface tension, which minimizes the surface area of the liquid.
Correct Answer: C — Surface tension
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Q. What is the primary reason for the increase in viscosity of a liquid with molecular weight?
A.
Increased intermolecular forces
B.
Decreased temperature
C.
Increased pressure
D.
Decreased density
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Solution
Higher molecular weight leads to increased intermolecular forces, resulting in higher viscosity.
Correct Answer: A — Increased intermolecular forces
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Q. What is the primary reason for the phenomenon of capillarity?
A.
Surface tension
B.
Viscosity
C.
Density
D.
Pressure
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Solution
Capillarity is primarily caused by surface tension, which allows liquids to rise or fall in narrow spaces against gravity.
Correct Answer: A — Surface tension
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Q. What is the principle behind Archimedes' principle?
A.
Buoyant force
B.
Pressure difference
C.
Surface tension
D.
Viscosity
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Solution
Archimedes' principle states that a body submerged in a fluid experiences a buoyant force equal to the weight of the fluid displaced.
Correct Answer: A — Buoyant force
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Q. What is the relationship between bulk modulus and compressibility?
A.
Bulk modulus is the inverse of compressibility
B.
Bulk modulus is equal to compressibility
C.
Bulk modulus is the square of compressibility
D.
There is no relationship
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Solution
Bulk modulus is defined as the reciprocal of compressibility, indicating how incompressible a material is.
Correct Answer: A — Bulk modulus is the inverse of compressibility
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Q. What is the relationship between pressure and depth in a fluid?
A.
Pressure increases with depth
B.
Pressure decreases with depth
C.
Pressure remains constant
D.
Pressure is independent of depth
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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 — Pressure increases with depth
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Q. What is the relationship between shear modulus (G) and Young's modulus (E)?
A.
G = E / (2(1 + ν))
B.
G = E * (2(1 + ν))
C.
G = E / (1 + ν)
D.
G = E * (1 + ν)
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Solution
The relationship is given by G = E / (2(1 + ν)), where ν is Poisson's ratio.
Correct Answer: A — G = E / (2(1 + ν))
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