Relative DensityPractice Questions & MCQs
Practice Relative Density questions from Gravitation (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then 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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Where can I practise Relative Density questions for Class 9 Science?
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Are these Relative Density questions important for the exam?
Yes. These Relative Density important questions follow the Science exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
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Every Relative Density question on RankByte comes with the correct answer and a full step-by-step solution, so you learn the concept instead of just guessing.