Structure of Matter and Kinetic Theory - 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 1980

The water at the bottom of a waterfall is slightly warmer than that at the top because part of the

A. Potential energy raises the water temperature
B. Water absorbs latent heat from the atmosphere
C. Kinetic energy is changed intyo internal energy
D. Dropping mass of water increases the heat capacity
E. A and C above

Question 4:

• 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 5:

• JAMB 1984

A small steel needle is carefully floated on water in a beaker. When a few drops of kerosine are introduced into the water the needle sink. Which of the following statements correctly explain(s) the observation? i. there is tension on the water surface ii. kerosine reduces the density of water so that needle becomes denser than water iii. kerosine reduces the surface tension of water

A. I only
B. Ii only
C. Iii only
D. I and ii
E. I and iii