Final Quiz No. 2: Act. 7 - 12

Liquids have a definite volume, but no definite shape. It’s because intermolecular forces in liquids are strong enough to hold the molecules together, but not strong enough to fix them into definite or concrete locations like they are in solids. As a result, they are fluid but lack a defined shape.

• True

• False

Water has a higher viscosity than glycerol because it has more hydrogen bonding in its molecules due to the pressure of three-Oil groups in it, whereas glycerol molecules have less hydrogen bonding.

• True

• False

Which of these ratios gives the value of viscosity of fluid?

• Ratio of the shearing stress to the weight of the fluid

• Ratio of the shearing stress to the density of the fluid

• Ratio of the velocity gradient and shearing stress

• The ratio of the shearing stress to the velocity gradient

What is surface tension?

• The tendency of a liquid to evaporate

• The force that pulls objects downward towards the center of the Earth

• The resistance of a liquid to flow

• The elastic property of the surface of a liquid that minimizes its surface area

What unit is used to measure surface tension?

• Newtons per meter (N/m)

• Joules per kilogram (J/kg)

• Meters per second (m/s)

• Kilograms per cubic meter (kg/m³)

Which of the following factors affects the surface tension of a liquid?

• Temperature

• Volume

• Color

• Density

What causes surface tension in liquids?

• The gravitational force acting on the liquid molecules

• The cohesive forces between liquid molecules

• The repulsive forces between liquid molecules

• The random motion of liquid molecules

How does surface tension enable certain insects to walk on water?

• Surface tension creates an upward force on the insects.

• Surface tension increases the density of water.

• Surface tension decreases the viscosity of water.

• Surface tension prevents the insects from sinking by supporting their weight

What happens to the meniscus in a capillary tube when the liquid's adhesive forces with the tube are stronger than its cohesive forces?

• The meniscus becomes concave.

• The meniscus becomes convex.

• The meniscus remains flat.

• The meniscus disappears.

Which of the following contribute to the reason behind the origin of surface tension?

• only cohesive forces

• only adhesive forces

• neither cohesive forces nor adhesive forces

• both cohesive forces and adhesive forces