Relative Density MCQs
Practice Relative Density multiple-choice questions from Gravitation (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Relative DensityQuiz - Solve & Score
Q1. During a school laboratory session a metallurgist weighs a block of aluminium and finds its density to be 2.7 g/cm^3, while the jar of water on the same bench reads 1 g/cm^3; what relative density does the aluminium have?
- A.2.7 g/cm^3
- B.3.7
- C.2.7
- D.0.3704
Answer: C. 2.7
Relative density = density of substance / density of water = 2.7 g/cm^3 / 1 g/cm^3 = 2.7. It is a ratio of two densities, so it has no units.
Q2. At an antique fair a chemistry student inspects an ingot cast from iron and measures its density as 7.8 g/cm^3, comparing it against a beaker of water at 1 g/cm^3; what is the relative density of the iron?
- A.7.8
- B.7.8 g/cm^3
- C.0.1282
- D.8.8
Answer: A. 7.8
Relative density = density of substance / density of water = 7.8 g/cm^3 / 1 g/cm^3 = 7.8. It is a ratio of two densities, so it has no units.
Q3. Inside a workshop a jeweller clamps a rod of copper and records a density of 8.9 g/cm^3, then notes the tap water nearby at 1 g/cm^3; what value of relative density follows for the copper?
- A.9.9
- B.0.1124
- C.8.9
- D.8.9 g/cm^3
Answer: C. 8.9
Relative density = density of substance / density of water = 8.9 g/cm^3 / 1 g/cm^3 = 8.9. It is a ratio of two densities, so it has no units.
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