Capillary Action Quiz: Test Your Knowledge Of Liquid Rise

9th Grade

Reviewed by Ekaterina Yukhnovich

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By Thames

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| Questions: 20 | Updated: Mar 13, 2026

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1. Capillary action is the tendency of a liquid to:

Stop flowing in thin tubes

Rise or fall in narrow spaces due to surface tension and adhesion

Always form bubbles

Become more viscous in small containers

Concept: capillary action. In small tubes, surface effects matter a lot compared to weight. Adhesion and surface tension can pull a liquid upward or push it downward.

Explanation

Concept: capillary action. In small tubes, surface effects matter a lot compared to weight. Adhesion and surface tension can pull a liquid upward or push it downward.

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About This Quiz

Capillary Action Quiz: Test Your Knowledge Of Liquid Rise - Quiz

This assessment explores the fascinating phenomenon of capillary action, evaluating your understanding of liquid rise in various contexts. Key concepts include the forces at play, the role of surface tension, and practical applications in nature and technology. Engaging with this material is essential for anyone interested in fluid dynamics, as... see moreit enhances comprehension of how liquids behave in different environments. see less

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2. Water typically rises in a clean glass capillary because glass is hydrophilic.

True

False

Concept: hydrophilic surfaces. Strong adhesion between water and glass helps water spread along the glass. This creates a curved surface that can pull the water column upward.

Explanation

Concept: hydrophilic surfaces. Strong adhesion between water and glass helps water spread along the glass. This creates a curved surface that can pull the water column upward.

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3. A concave meniscus (edges higher than the centre) happens when:

Adhesion to the wall is stronger than cohesion within the liquid

Cohesion is stronger than adhesion

The liquid is very dense

The tube is wide

Concept: meniscus shape. Strong adhesion pulls the liquid up the wall. The surface curves upward at the edges to satisfy that interaction.

Explanation

Concept: meniscus shape. Strong adhesion pulls the liquid up the wall. The surface curves upward at the edges to satisfy that interaction.

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4. The thinner the capillary tube (smaller radius), the capillary rise tends to be ______.

Concept: size dependence (qualitative). In narrower tubes, surface forces act around a smaller cross-section of liquid. That makes surface tension effects more significant relative to the liquid’s weight.

Explanation

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5. Mercury in glass typically shows a convex meniscus mainly because:

Mercury is less dense than water

Mercury is a gas at room temperature

Cohesion in mercury dominates over adhesion to glass

Glass always repels all liquids

Concept: cohesion dominance. Mercury atoms attract each other strongly and do not adhere well to glass. The surface bulges upward in the centre, producing a convex meniscus.

Explanation

Concept: cohesion dominance. Mercury atoms attract each other strongly and do not adhere well to glass. The surface bulges upward in the centre, producing a convex meniscus.

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6. Capillary action can help a paper towel absorb water.

True

False

Concept: capillaries in porous materials. Paper towels contain many tiny pores that act like capillaries. Adhesion and surface tension pull water through these narrow spaces.

Explanation

Concept: capillaries in porous materials. Paper towels contain many tiny pores that act like capillaries. Adhesion and surface tension pull water through these narrow spaces.

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7. If you add detergent to water, capillary rise in a thin glass tube usually:

Increases a lot

Decreases

Stays exactly the same

Becomes impossible to predict

Concept: surface tension reduction. Lower surface tension means a weaker 'pull' along the surface curve. That typically reduces the height that capillary action can support.

Explanation

Concept: surface tension reduction. Lower surface tension means a weaker 'pull' along the surface curve. That typically reduces the height that capillary action can support.

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8. Capillary rise depends on both surface tension and ______ between the liquid and the tube.

Concept: interfacial interaction. Adhesion determines whether the liquid climbs the wall and forms a concave surface. Without sufficient adhesion, the capillary effect can reverse or weaken.

Explanation

Concept: interfacial interaction. Adhesion determines whether the liquid climbs the wall and forms a concave surface. Without sufficient adhesion, the capillary effect can reverse or weaken.

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9. Capillary action is more noticeable in narrow tubes than in wide tubes.

True

False

Concept: surface-to-volume effects. Narrow spaces increase the importance of surface forces. In wide tubes, gravity dominates and the surface effect is comparatively small.

Explanation

Concept: surface-to-volume effects. Narrow spaces increase the importance of surface forces. In wide tubes, gravity dominates and the surface effect is comparatively small.

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10. Which everyday example is most related to capillary action?

A stone sinking in a lake

Water moving up plant stems (xylem)

A balloon popping

Sound echoes in a hallway

Concept: biological capillaries. Plants use narrow channels where surface tension and adhesion help lift water. This is especially important at small scales in plant tissues.

Explanation

Concept: biological capillaries. Plants use narrow channels where surface tension and adhesion help lift water. This is especially important at small scales in plant tissues.

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11. A hydrophobic surface tends to produce a meniscus that is more likely:

Strongly concave for water

Less wetting, with a larger contact angle

Always flat

Independent of the liquid

Concept: hydrophobic wetting. Hydrophobic surfaces reduce adhesion for water. That increases the contact angle and reduces the tendency to climb the walls.

Explanation

Concept: hydrophobic wetting. Hydrophobic surfaces reduce adhesion for water. That increases the contact angle and reduces the tendency to climb the walls.

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12. If adhesion is weak enough, capillary action can cause a liquid level to be depressed rather than raised.

True

False

Concept: capillary depression. When cohesion dominates and the surface curves the opposite way, the pressure effect can push the liquid downward. Mercury in glass is a classic example.

Explanation

Concept: capillary depression. When cohesion dominates and the surface curves the opposite way, the pressure effect can push the liquid downward. Mercury in glass is a classic example.

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13. The curved surface in a capillary tube matters because it creates:

Extra gravity

A pressure difference across the curved surface

A change in density

A magnetic field

Concept: curvature and pressure (qualitative). Curved liquid surfaces have different pressures on each side. That pressure difference can support a column of liquid against gravity.

Explanation

Concept: curvature and pressure (qualitative). Curved liquid surfaces have different pressures on each side. That pressure difference can support a column of liquid against gravity.

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14. A surface that water spreads on easily is called ______.

Concept: wetting terminology. Hydrophilic means 'water-loving' and typically corresponds to stronger adhesion. This leads to better wetting and smaller contact angles.

Explanation

Concept: wetting terminology. Hydrophilic means 'water-loving' and typically corresponds to stronger adhesion. This leads to better wetting and smaller contact angles.

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15. Which change would most likely increase water’s capillary rise in the same glass tube?

Adding soap

Heating the water slightly

Cooling the water slightly (within normal liquid range)

Using a wider tube

Concept: surface tension vs temperature (qualitative). Cooler water generally has higher surface tension, strengthening capillary effects. A wider tube reduces capillary rise because gravity dominates more.

Explanation

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16. Capillary action is one reason ink can spread through the tip of a felt pen.

True

False

Concept: capillary flow in porous media. Felt contains many tiny channels. Surface tension and adhesion draw ink through those channels to the writing tip.

Explanation

Concept: capillary flow in porous media. Felt contains many tiny channels. Surface tension and adhesion draw ink through those channels to the writing tip.

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17. In capillary rise, the upward pull is mainly associated with:

Atmospheric pressure alone

Surface tension acting along the contact line plus adhesion to the wall

Viscosity increasing

The liquid becoming lighter

Concept: contact line forces (qualitative). Surface tension acts along the edge where liquid meets the tube. With wetting (adhesion), this force has an upward component that supports the liquid column.

Explanation

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18. Capillary effects are strongest when the ratio of surface area to volume is ______.

Concept: scaling with size. Small systems have more surface relative to their volume. That makes surface forces more influential compared to weight.

Explanation

Concept: scaling with size. Small systems have more surface relative to their volume. That makes surface forces more influential compared to weight.

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19. Which pairing is most likely to show strong capillary rise?

Water in a wide plastic cup

Water in a very thin clean glass tube

Mercury in a wide glass beaker

Oil on a waxed surface

Concept: conditions for capillary rise. Narrow tubes amplify surface effects, and clean glass is wetting for water. Those conditions favour a concave meniscus and noticeable rise.

Explanation

Concept: conditions for capillary rise. Narrow tubes amplify surface effects, and clean glass is wetting for water. Those conditions favour a concave meniscus and noticeable rise.

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20. Capillary action can occur even without any pump, because surface forces can do work at small scales.

True

False

Concept: surface forces doing work. Surface tension and adhesion can move liquids by changing interfacial energy. At small scales, these forces can be strong enough to lift fluids against gravity.

Explanation

Concept: surface forces doing work. Surface tension and adhesion can move liquids by changing interfacial energy. At small scales, these forces can be strong enough to lift fluids against gravity.

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