Liquids At Rest - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1983

Which of the following may be used to determine the relative humidity in a physics laboratory
I. Manometer
II. Wet-and-Dry Bulb Hygrometer
III. Hair Hygrometer
IV. A Hydrometer

A. I Only
B. II and III Only
C. II Only
D. III Only
E. II,IIIand IV Only

Question 7:

• JAMB 1984

What volume of alcohol with a density of 8.4 x 10²kgm^-3 will have the same mass as 4.2m³of petrol whose density is 7.2 x 10²kgm^-3?

A. 14m³
B. 3.6m³
C. 4.9m³
D. 5.0m³
E. 5.8m³

Question 8:

• JAMB 1985

A uniform cylindrical block of wood floats in water with one-third of its height above the water level, in a liquid of relative density 0.8, what fraction of its height will be above the liquid level?

A. \(\frac{1}{6}\)
B. \(\frac{1}{5}\)
C. \(\frac{1}{3}\)
D. \(\frac{4}{5}\)
E. \(\frac{5}{6}\)

Question 9:

• JAMB 1986

A heavy object is suspended from a string and lowered into water so that it is completely submerged. The object appears lighter because

A. The density of water is less than that of the object
B. The pressure is low just below the water surface
C. It experiences an upthrust
D. The tension in the string neutralizes part of the weight

Question 10:

• JAMB 1987

A cube of side 10cm and mass 0.5kg floats in a liquid with only \(\frac{1}{5}\) of its height above the liquid surface. What is the relative density of the liquid?

A. 0.125cm^-1
B. 0.250gcm^-1
C. 0.625cm^-1
D. 2.500cm^-1