Search SchoolNGR

Wednesday, 28 October 2026
Register . Login

Physics Past Questions and Answers

Jamb 2019 Physics Questions

Question 86:
A safety precaution designed to prolong the life of a lead acid accumulator is
  • A By topping up the cells with concentrated acid
  • B The use of naked flame when charging the battery
  • C Keeping the specific gravity of the electrolyte within specified range
  • D By connecting wires to the terminals directly when testing the level of charging
View Answer & Explanation
Question 87:
The mass of water vapour in a given volume of air is 0.05g at 20°C, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air.
  • A 3.33%
  • B 5.55%
  • C 33.33%
  • D 55.55%
View Answer & Explanation
Question 88:
The angular dispersion of a prism depends on
  • A The index of refraction only
  • B The angle of incidence as well as the index of refraction
  • C The angle of incidence only
  • D The thickness of the prism only
View Answer & Explanation
Question 89:
Which of the following statements are correct of the production and propagation of waves?
I. vibration produces waves
II. waves transmit energy along the medium
III. the medium through which the wave travels does not travel with the wave
IV. waves do not require any medium for transmission
  • A I & IV only
  • B II & IV only
  • C III & IV only
  • D I, II and III only
View Answer & Explanation
Question 90:
A rectangular solid black has length 10cm, breadth 5cm and height 2cm. If it lies on a horizontal surface, and has density 100kg/m\(^3\), calculate the pressure it exerts on the surface.
  • A 200 N/m\(^2\)
  • B 300 N/m\(^2\)
  • C 100 N/m\(^2\)
  • D 400 N/m\(^2\)
View Answer & Explanation