Molecular nature of matter - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1989

A thin film of liquid is trapped between two glass plates. The force required to pull the plates apart will increase if the

A. Surface tension of the liquid is reduced
B. Perpendicular distance between the plates is increased
C. Area of the liquid surface in contact with the plates is increased
D. Pressure of the air is decreased

Question 7:

• JAMB 1997

A piece of wire gauze can be made to lie on water because

A. The wire guaze is less dense than water
B. The water molecules repels the wire guaze upwards
C. The water surface has the effect of an elastic thin skin
D. Of the cohensive forces between the water and the wire guaze molecules

Question 8:

• JAMB 1999

When temperature of a liquid increases, its surface tension

A. Decreases
B. Increases
C. Remain Constant
D. Increases then decreases

Question 9:

• JAMB 2003

Water does not drop through an open umbrella of silk materials unless the inside of the umbrella is touched. This is due to

A. Capilarity
B. Osmotic pressure
C. Viscosity
D. Surface tension

Question 10:

• JAMB 2007

I. Mass
II. Density
III. Temperature
IV. Nature of substance
which of the above affect diffusion?

A. I and II only
B. I,II and IV only
C. II, III and IV only
D. I, II, III and IV