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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Length, area and volume

Jamb Physics Questions - Length, area and volume

Question 16:
A cube of side 10cm and mass 0.5kg floats in a liquid with only \(\frac{1}{5}\) of its height above the liquid surface. What is the relative density of the liquid?
  • A 0.125cm<sup style='font-size: smaller;'>-1</sup>
  • B 0.250gcm<sup style='font-size: smaller;'>-1</sup>
  • C 0.625cm<sup style='font-size: smaller;'>-1</sup>
  • D 2.500cm<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 17:
Hot water is added to three times its mass of water at 10oC and the resultant temperature is 20oC. What is the initial temperature of the hot water?
  • A 100<sup style='font-size: smaller;'>o</sup>C
  • B 80<sup style='font-size: smaller;'>o</sup>C
  • C 50<sup style='font-size: smaller;'>o</sup>C
  • D 40<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation
Question 18:
A body whose mass is 2kg and has a volume of 500cm3 just floats when completely immersed in a liquid. Calculate the density of the liquid
  • A 4.0 x 10<sup style='font-size: smaller;'>2</sup>kgm<sup style='font-size: smaller;'>-3</sup>
  • B 4.0 x 10<sup style='font-size: smaller;'>3</sup>kgm<sup style='font-size: smaller;'>-3</sup>
  • C 1.0 x 10<sup style='font-size: smaller;'>3</sup>kgm<sup style='font-size: smaller;'>-3</sup>
  • D 1.0 x 10<sup style='font-size: smaller;'>6</sup>kgm<sup style='font-size: smaller;'>-3</sup>
View Answer & Explanation
Question 19:
A tap supplies water at 25oC while another supplies water at 75oC. If a man wishes to bathe with water at 40oC, the ratio of the mass of cold water to the mass of hot water required is
  • A 1 : 3
  • B 15 : 8
  • C 7 : 3
  • D 3 : 1
View Answer & Explanation
Question 20:
A piece of wood of mass 40g and uniform cross-sectional area of 2cm2 floats upright in water. The length of the wood immersed is
  • A 30cm
  • B 40cm
  • C 20cm
  • D 2cm
View Answer & Explanation