JAMB Physics 2007 Objective — Question 34

Question 34 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2007 Objective paper, with the correct answer and a full explanation.

A piece of iron weighs 250N in air and 200N in a liquid of density 1000kgm-3. The volume of the iron is [g=10ms-2]

A. 2.0x10^-3 m3
B. 2.5x10^-3 m3
C. 4.5x10^-3 m3
D. 5.0x10^-3 m3Correct

Explanation

Upthrust = 250-200 = 50N = weight of fluid displaced. Mass of fluid displaced = 50/10 = 5kg. Volume = mass/density = 5/1000 = 0.005m3 = 5.0x10^-3 m3.

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