Surface Tension

Surface tension is the property of a liquid that arises due to:

• Gravitational force between molecules

• Repulsive forces between molecules

• Cohesive forces between molecules

• Electrostatic forces between molecules

The SI unit of surface tension is:

• 1. a) Newton per meter (N/m)

  
  

• 1. b) Pascal per square meter (Pa/m^2)

  
  

• 1. c) Joule per cubic meter (J/m^3)

  
  

• 1. d) Kilogram per second (kg/s)

  
  

Which of the following phenomena is NOT a result of surface tension?

• a) Formation of soap bubbles

• b) Capillary action

• c) Floating of a needle on water

• d) Evaporation of a liquid

The property of surface tension is responsible for the shape of a liquid drop being:

• a) Cylindrical

• b) Spherical

• c) Cubical

• d) Pyramidal

The angle of contact between a liquid and a solid surface is minimum for a liquid with:

• a) High surface tension

• b) Low surface tension

• c) Medium surface tension

• d) No surface tension

When a liquid wets a solid surface completely, the angle of contact is:

• a) 0 degrees

• b) 45 degrees

• c) 90 degrees

• d) 180 degrees

Which of the following substances would have the highest surface tension?

• a) Water at 20°C

• b) Mercury at room temperature

• c) Ethanol at 25°C

• d) Oil at 30°C

The presence of impurities in a liquid generally:

• a) Increases surface tension

• b) Decreases surface tension

• c) Has no effect on surface tension

• d) Changes the liquid's color

Surface tension is primarily caused by:

• a) Gravitational forces

• b) Magnetic forces

• c) Electrostatic forces

• d) Intermolecular forces

Tags

NGSS.HS-PS1-3

Which force is responsible for pulling a liquid droplet into a spherical shape?