Elasticity and Surface Tension

What is the property of a liquid due to which its free surface tries to have minimum surface area?

• Viscosity

• Buoyancy

• Surface tension

• Rigidity

Which is the effect of increase in the temperature on the surface tension of the liquid?

• it decreases

• it increases

• it remains the same

• None of the above

The surface energy of a substance is defined as …

• the energy required for the formation of a new unit area of surface.

• the strength of the bonds that hold the substance together.

• the energy released when a new unit area of surface is created.

• the extent to which water wets the surface of the substance at room temperature.

Which characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of the water?

• adhesion
• surface tension
• solvent properties
• nonpolar

The rain drops are in spherical shape due to

• viscosity

• thrust on drop

• surface tension

• residual pressure

The force of attraction between the molecules of the same substance is called as

• adhesive force

• force of surface tension

• cohesive force

• electrostatic force

An example of a perfectly plastic body is ___________

• Quartz

• Putty

• Crystal

• Rubber

Steel is preferred for making springs over copper. Why?

• Steel is cheaper           

• Young’s modulus of steel is more than that of copper

• Young ‘s modulus of copper is more than that of steel

• Steel  is less likely to be oxidised.

The slope of the stress verse strain curve is

• Directly proportional to modulus of elasticity

• Inversely proportional to the modulus of elasticity

• Directly proportional to the elastic limit

• Inversely proportional to the elastic limit.

Which of the following is true for Hooke’s Law?

• Stress is directly proportional to strain within elastic limit

• Stress is inversely proportional to strain

• Stress and strain are not related

• Stress is directly proportional to strain beyond elastic limit