Grade 9 Physics – Thrust in Fluids, Archimedes’ Principle, Density and Flotation (Fill in the Blanks with Answers)

Grade 9 Physics – Thrust in Fluids, Archimedes’
Principle and Flotation (Fill in the Blanks with
Answers)

FILL IN THE BLANKS (WITH ANSWERS)

1.​ Upward force acting on a body in a fluid is called ________.
Answer: Upthrust

2.​ Another name for upthrust is ________.
Answer: Buoyant force

3.​ The principle explaining floating of bodies is ________.
Answer: Archimedes’ Principle

4.​ Density is defined as ________ per unit volume.
Answer: Mass

5.​ SI unit of density is ________.
Answer: kg/m³

6.​ Relative density of pure water is ________.
Answer: 1

7.​ A body floats when upthrust is equal to ________.
Answer: Weight

8.​ A body sinks when its weight is ________ than upthrust.
Answer: Greater

9.​ Instrument used to measure relative density of liquids is ________.
Answer: Hydrometer