Quiz for Surface tension

Q1: Which of the following has the maximum surface tension at room temperature?

A. Water B. Mercury C. Ethyl alcohol D. Glycerine

Q2: The SI unit of surface tension is:

A. N/m B. N/m² C. dyne/cm D. J/m²

Q3: Which one of the following helps in the formation of spherical drops of liquid?

A. Cohesive force B. Adhesive force C. Gravitational force D. Viscous force

Q4: Capillary rise is due to:

A. Adhesion only B. Cohesion only C. Surface tension D. Both adhesion and surface tension

Q5: The angle of contact for water and glass is:

A. 0° B. 90° C. obtuse D. acute

Q6: With increase in temperature, surface tension of liquids:

A. Increases B. Decreases C. Remains constant D. Becomes zero

Q7: The pressure inside a soap bubble is:

A. Less than atmospheric pressure B. Equal to atmospheric pressure C. More than atmospheric pressure D. Zero

Q8: Which of the following does NOT affect surface tension?

A. Temperature B. Impurities C. Area of surface D. Nature of liquid

Q9: Capillary action is more prominent in:

A. Wider tubes B. Narrower tubes C. Liquids of low surface tension D. Solids

Q10: The rise of liquid in a capillary tube stops when:

A. Weight of liquid balances upward force B. Tube is full C. Liquid evaporates D. Pressure is zero

Q11: Soap decreases surface tension by:

A. Increasing adhesion B. Decreasing cohesion C. Breaking molecular bonds D. Forming micelles

Q12: Which phenomenon is responsible for the ability of insects to walk on water?

A. Viscosity B. Adhesion C. Capillarity D. Surface tension

Q13: A drop of liquid is spherical in shape due to:

A. Surface tension B. Atmospheric pressure C. Gravitational pull D. Viscosity

Q14: Which quantity determines the rise in a capillary tube?

A. Viscosity B. Surface tension C. Mass of liquid D. Length of tube

Q15: The rise of liquid in capillary tube is independent of:

A. Surface tension B. Density of liquid C. Radius of tube D. Length of tube above liquid

Q16: Angle of contact is defined between:

A. Solid and gas B. Solid and liquid C. Liquid and gas D. Solid-liquid-gas interface

Q17: Which has the lowest surface tension?

A. Water B. Benzene C. Mercury D. Soap solution

Q18: When a glass capillary is dipped in water, the water rises due to:

A. Cohesion B. Adhesion C. Atmospheric pressure D. Vacuum

Q19: Excess pressure inside a soap bubble is:

A. 2T/r B. 4T/r C. T/2r D. Zero

Q20: The terminal velocity of a raindrop is affected by:

A. Only mass B. Only viscosity C. Only surface tension D. All of the above