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JAMB Physics 2001 Question 5

Question 5

Measurement and Units

If a spherical metal bob of radius 3 cm is fully immersed in a cylinder containing water and the water level rises by 1 cm, what is the radius of the cylinder?

  1. A.12 cm
  2. B.1 cm
  3. C.3 cm
  4. D.6 cm
Show the answer and explanation

Answer: D (6 cm)

Explanation

Volume of bob = water displaced: (4/3)π × 33 = πr2 × 1, so 36 = r2 and r = 6 cm.