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JAMB Physics 1990 Question 13

Question 13

Pressure

What is the length of the liquid column in a barometer tube that would support an atmospheric pressure of 102000 N m−2 if the density of the liquid is 2600 kg m−3? [g = 10 m s−2]

  1. A.0.75 m
  2. B.0.76 m
  3. C.3.92 m
  4. D.39.23 m
Show the answer and explanation

Answer: C (3.92 m)

Explanation

p = hρg, so h = 102 000/(2600 × 10) ≈ 3.92 m.