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Sunday, 01 November 2026
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Physics Past Questions and Answers

Jamb 1985 Physics Questions

Question 11:
A force of 100N stretches an elastic string to a total length of 20cm. If an additional force of 100N stretches the string 5cm further, Find the natural length of the string
  • A 15cm
  • B 12cm
  • C 10cm
  • D 8cm
  • E 5cm
View Answer & Explanation
Question 12:
Two divers G and H are at depths 20m and 40m respectively below the water surface in a lake. The pressure on G is P1 while the pressure on H is P2. If the atmospheric pressure is equivalent to 10m of water, then the value of \( \frac{p_2}{p_1} \) is
  • A 0.50
  • B 0.60
  • C 1.67
  • D 2.00
  • E 3.0
View Answer & Explanation
Question 13:
The areas of the effort and load pistons of a hydraulic press are 0.5m2 and 5m2 respectively. If a force F1 of 100N is applied on the effort piston, the force F2 on the load is
  • A 10N
  • B 100N
  • C 500N
  • D 1000N
  • E 5000N
View Answer & Explanation
Question 14:
A metal cube of volume 103mm3 is lowered into a measuring cylinder containing water. If the internal cross-sectional area of the cylinder is 1.5 x 102mm2, by how much does the water level rise in the cylinder?
  • A 6.67 x 10<sup style='font-size: smaller;'>0</sup>mm
  • B 8.50 x 10<sup style='font-size: smaller;'>2</sup>mm
  • C 1.15 x 10<sup style='font-size: smaller;'>3</sup>mm
  • D 2.50 x 10<sup style='font-size: smaller;'>3</sup>mm
  • E 1.50 x 10<sup style='font-size: smaller;'>5</sup>mm
View Answer & Explanation
Question 15:
A uniform cylindrical block of wood floats in water with one-third of its height above the water level, in a liquid of relative density 0.8, what fraction of its height will be above the liquid level?
  • A \(\frac{1}{6}\)
  • B \(\frac{1}{5}\)
  • C \(\frac{1}{3}\)
  • D \(\frac{4}{5}\)
  • E \(\frac{5}{6}\)
View Answer & Explanation