Buoyancy and Archimedes' PrinciplePractice Questions & MCQs
Practice Buoyancy and Archimedes' Principle 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.
Buoyancy and Archimedes' PrincipleQuiz - Solve & Score
Q1. A goldsmith checks an ornament: it weighs 45 N in air and 41 N when hung in water. What is the relative density (specific gravity) of the material?
- A.1.0976
- B.11.25
- C.0.0889
- D.10.25
Answer: B. 11.25
Loss of weight in water = 45 - 41 = 4 N (= weight of displaced water). Relative density = weight in air / loss of weight = 45 / 4 = 11.25.
Q2. To test a coin a student finds its weight is 30 N in air but only 24 N submerged in water. What is the relative density (specific gravity) of the material?
- A.4
- B.0.2
- C.5
- D.1.25
Answer: C. 5
Loss of weight in water = 30 - 24 = 6 N (= weight of displaced water). Relative density = weight in air / loss of weight = 30 / 6 = 5.
Q3. A curator records that an artefact weighs 25 N dry and 15 N while fully under water. What is the relative density (specific gravity) of the material?
- A.1.6667
- B.2.5
- C.0.4
- D.1.5
Answer: B. 2.5
Loss of weight in water = 25 - 15 = 10 N (= weight of displaced water). Relative density = weight in air / loss of weight = 25 / 10 = 2.5.
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