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A solid weighs 4.8g in air, 2.8g in water and 3.2g in Kerosine. The ratio...

Physics
JAMB 2020

A solid weighs 4.8g in air, 2.8g in water and 3.2g in Kerosine. The ratio of density of the solid to that of the kerosine is 

  • A. 2
  • B. \(\frac{3}{2}\)
  • C. \(\frac{2}{3}\)
  • D. 3
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Correct Answer: Option D
Explanation

Relative density of solid

\(\frac{\text{weight of solid}}{\text{weight of an equal volume of water}}\)

= \(\frac{4.8}{4.8 - 2.8}\) 

= \(\frac{4.8}{2}\) = 2.4

Relative density of liquid 

=   \(\frac{\text{Weight  of liquid kerosine}}{\text{Weight of an equal volume of water}}\) 

= \(\frac{4.8 - 3.2}{4.8 - 2.8}\)  = \(\frac{1.6}{2}\) = 0.8

= \(\frac{\text{Ratio of relative density of solid}}{\text{Relative density of Kerosine}}\) 

= \(\frac{\text{density of solid}}{\text{density of Kerosine}}\)

= \(\frac{2.4}{0.8}\) 

= 3

 

 

There is an explanation video available below.


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Explanation Video

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts