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Monday, 02 November 2026
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Physics Past Questions and Answers

Jamb 1984 Physics Questions

Question 16:
The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?
  • A 55.3<sup style='font-size: smaller;'>o</sup>C
  • B 23.3<sup style='font-size: smaller;'>o</sup>C
  • C 49.0<sup style='font-size: smaller;'>o</sup>C
  • D 16.1<sup style='font-size: smaller;'>o</sup>C
  • E 76.7<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation
Question 17:
If a solid changes directly into a gas when heat is applied the process is called
  • A Vaporization
  • B Evaporation
  • C Sublimation
  • D Ionization
  • E Conversion
View Answer & Explanation
Question 18:
A plane inclined at an angle of 30o to the horizontal has an efficiency of 60%. The force parallel to the plane required to push a load of 120N uniformly up the plane is
  • A 60N
  • B 100N
  • C 120N
  • D 200N
  • E 240N
View Answer & Explanation
Question 19:
A body of mass 5kg initially at rest is acted upon by two mutually perpendicular forces 12N and 5N as shown in fig.3. If the particle moves in the direction QA, calculate the magnitude of the acceleration
  • A 0.40ms<sup style='font-size: smaller;'>-2</sup>
  • B 1.40ms<sup style='font-size: smaller;'>-2</sup>
  • C 0.26ms<sup style='font-size: smaller;'>-2</sup>
  • D 2.60ms<sup style='font-size: smaller;'>-2</sup>
  • E 3.40ms<sup style='font-size: smaller;'>-2</sup>
View Answer & Explanation
Question 20:
A small steel needle is carefully floated on water in a beaker. When a few drops of kerosine are introduced into the water the needle sink. Which of the following statements correctly explain(s) the observation? i. there is tension on the water surface ii. kerosine reduces the density of water so that needle becomes denser than water iii. kerosine reduces the surface tension of water
  • A I only
  • B Ii only
  • C Iii only
  • D I and ii
  • E I and iii
View Answer & Explanation