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

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

The force that pushes a body in a liquid upwards is called _______ (JAMB 2022)

A. upthrust   B. weight   C. thrust   D. viscosity

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

From the diagram above, at terminal velocity, the three forces are related by the expression. (JAMB 2015)