Molecular nature of matter - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 1978

A few grains of table salt were put in a cup of water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. The action is due to

A. Convection
B. Osmosis
C. Capillarity
D. Diffusion
E. Conductivity

Question 2:

• JAMB 1980

which of the following does NOT cause a reduction of the surface tension of water?

A. Soap solution
B. Detergent
C. Alcohol
D. Camphor
E. Grease

Question 3:

• JAMB 1983

1,000 identical drops of oil of density 500kgm^-3 have a total mass of 5 x 10^-4kg. One of the drops forms a thin film of area 0.5m² on water. The thickness of the film is

A. 2 x 10^-8m
B. 2 x 10^-9m
C. 2 x 10^-7m
D. 3 x 10^-9m
E. 2.8 x 10^-8m

Question 4:

• JAMB 1985

Which of the following phenomena CANNOT be explained by the molecular theory of matter?

A. Expansion
B. Conduction
C. Convection
D. Radiation
E. Evaporation

Question 5:

• JAMB 1987

If a beaker is filled with water it is observed that the surface of the water is not horizontal at the glass-water interface. This behavior is due to

A. Friction
B. Viscosity
C. Surface tension
D. Evaporation