Universal law, g, free-fall, buoyancy, Archimedes, density/RDPractice Questions & MCQs
Practice Universal law, g, free-fall, buoyancy, Archimedes, density/RD 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.
Universal law, g, free-fall, buoyancy, Archimedes, density/RDQuiz - Solve & Score
Q1. A solid of mass 60 g and volume 50 cm³ is placed in water (density 1 g/cm³). Which statement is true?
- A.It sinks because its density (1.2 g/cm³) exceeds that of water.
- B.It floats with 50% volume submerged.
- C.It floats with 60% volume submerged.
- D.It remains stationary at any depth as it is in equilibrium.
Answer: A. It sinks because its density (1.2 g/cm³) exceeds that of water.
Given 60 g, 50 cm, 1 g, asked for the unknown. By Density = 60/50 = 1.2 g/cm³, which is greater than water's 1 g/cm³, so the solid sinks. Density = 60/50 = 1.2 g/cm³, which is greater than water's 1 g/cm³, so the solid sinks. Consequently option A) It sinks because its density (1.2 g/cm³) exceeds that of water.
Q2. The distance between two bodies is tripled and one of the masses is doubled. The gravitational force between them becomes what fraction of the original?
- A.2/9
- B.1/9
- C.2/3
- D.4/9
Answer: A. 2/9
Asked for the unknown; data is laid out in the stem. By The new force becomes 2/(3²) = 2/9 of the original. The new force becomes 2/(3²) = 2/9 of the original. Consequently option A) 2/9.
Q3. A ship floats with 80% of its volume submerged in sea water (RD 1.025). What percent of its volume will be submerged in fresh water?
- A.82%
- B.78%
- C.85%
- D.80%
Answer: A. 82%
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