The relationship between pressure, depth and density - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1980

The relative densities of zinc, brass, copper, gold and silver are respectively 7.1, 8.5, 8.9, 19.3, 10.5. A metal ornament which weighs 0.425kg and can displace 50 x 10^-6m³m of water is made of

A. Zinc
B. Brass
C. Copper
D. Gold
E. Silver

Question 7:

• JAMB 1981

A solid weighs 4.8g in air, 2.8g in water and 3.2g in kerosine. The ratio of density of the solid to that of the kerosine is

A. 12
B. 3
C. 2
D. \(\frac{3}{2}\)
E. \(\frac{5}{4}\)

Question 8:

• 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 9:

• JAMB 1986

A rectangular tank contains water to a depth of 2m, if the base is 4m x 3m, calculate the force on the base (Density of water = 10³kgm^-3, g = 10ms^-2)

A. 1.4 x 10²N
B. 24 x 10⁴N
C. 2.0 x 10⁴N
D. 1.7 x 10³N

Question 10:

• JAMB 2019

Water and Kerosine are drawn respectively into the two limbs of a Hare's apparatus. The destiny of water is 1.0gcm\(^{-3}\) and the density of kerosine is 0.80gcm\(^{-3}\). If the height of the water column is 20.0cm, calculate the height of the kerosine column.

A. 1.6cm
B. 16.0cm
C. 20.0cm
D. 25.0cm