Physics Practice Test – Density, Relative Density, Upthrust (Questions with Answers and Explanations)

The relative density of a liquid is the ratio of the _______ (JAMB 2016)

A. mass of water to the mass of an equal volume of liquid
B. upthrust in the liquid to the upthrust in water
C. density of water to density of the liquid
D. upthrust in water to the upthrust in the liquid

The density of a certain oil on frying becomes 0.4 kgm^-3 with volume of 20 m³. What will be its initial volume when its initial density is 0.8 kgm^-3 assuming no loss of oil due to spillage? (JAMB 2010)

A. 8 m³     B. 5 m³     C. 12 m³     D. 10 m³

A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid? [density of the cork = 0.25 x 10³ kgm^-3, density of liquid = 1.25 x 10³ kgm^-3] (JAMB 2013)

A. 0.1   B. 0.8   C. 0.5   D. 0.2

What volume of alcohol will have the same mass as 4.2 m³ of petrol? [density of alcohol = 8.4 x 10² kgm^-3, density of petrol = 7.2 x 10² kgm^-3] (JAMB 2013)

A. 4.9 m³   B. 0.8 m³ C. 1.4 m³   D. 3.6 m³

The density and weight of a body are 5000 kgm^-3 and 1.0 N respectively. What is the apparent weight of the body when fully immersed in water? (JAMB 2020)

A. 1.0 N   B. 0.2 N   C. 0.8 N   D. 0.08 N