Liquids at Rest
Physics · 50 practice questions
Determination of density of solids and liquids; relative density; upthrust on a body immersed in a liquid; Archimedes' principle and law of floatation and applications (ships, hydrometers).
- Distinguish between density and relative density of substances.
- Determine the upthrust on a body immersed in a liquid.
- Apply Archimedes' principle and the law of floatation to solve problems.
Try a few questions
- Practice question 1
Salinometers, a type of hydrometer, are used to measure the
- A.exact temperature of a liquid such as seawater
- B.salt concentration (and hence density) of a liquid such as seawater
- C.exact volume of a liquid such as seawater
- D.exact colour of a liquid such as seawater
Show the answer
B. salt concentration (and hence density) of a liquid such as seawater
A salinometer's calibrated scale relates the liquid's density directly to its dissolved salt concentration.
- Practice question 2
A plumb line uses the downward pull of gravity, combined with the principle that a suspended mass hangs vertically, to establish
- A.a true horizontal reference line
- B.an accurate measure of atmospheric pressure
- C.an accurate measure of a liquid's density
- D.a true vertical reference line
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D. a true vertical reference line
A freely suspended weight naturally aligns itself along the true vertical, which the plumb line uses as its reference.
- Practice question 3
A body remains suspended (neither floating nor sinking) within a fluid when its average density is
- A.greater than the density of the fluid
- B.exactly equal to the density of the fluid
- C.less than the density of the fluid
- D.completely unrelated to the density of the fluid
Show the answer
B. exactly equal to the density of the fluid
Matching densities means the upthrust exactly balances the body's weight at any depth, so it neither rises nor sinks.
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