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Home / Doubts and Solutions/ICSE/Class 9/Physics

A hydrometer of weight 10.5 gf, has the area of cross-section of its stem 0.2 cm2.  If the bulb of hydrometer has a volume of 8.5 cm3, find the

1. density of liquid in which only bulb of hydrometer gets immersed

2. density of another liquid in which 1.5 cm of its stem gets immersed

Asked by Topperlearning User 4th June 2014, 1:23 PM
Answered by Expert
Answer:

Wt of hydrometer = 10.5 gf

Volume of liquid displaced = Volume of the bulb = 8.5 cm3

Also, by the law of flotation

Wt. of liquid displaced = Wt. of hydrometer = 10.5 gf

Therefore, Density of liquid =

2. Volume of liquid displaced = Volume of bulb + Volume of 1.5 cm of stem

                                              = 8.5 cm3 + 1.5 X 0.2 cm3 = 8.8 cm3

Mass of liquid displaced = Mass of hydrometer = 10.5 g

Therefore, Density of liquid =

Answered by Expert 4th June 2014, 3:23 PM
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