Search SchoolNGR

Wednesday, 29 July 2026
Register . Login

Physics Past Questions and Answers

Jamb 2019 Physics Questions

Question 21:
Ripple in a power supply unit is caused by
  • A Using an alternating current source
  • B Forward voltage drop
  • C Heavy load
  • D Using a zener diode
View Answer & Explanation
Question 22:
When th temperature of a liquid is increased, its surface tension
  • A Increases
  • B Decreases
  • C Remain constant
  • D Increases then decreases
View Answer & Explanation
Question 23:
The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens
  • A 6.5 cm
  • B 7.5 cm
  • C 8.5 cm
  • D 4.5 cm
View Answer & Explanation
Question 24:
A ray of light passes through the centre of curvature of a concave mirror and strikes the mirror. At what angle is the ray reflected?
  • A 180\(^o\)
  • B 90\(^o\)
  • C 0\(^o\)
  • D 60\(^o\)
View Answer & Explanation
Question 25:
The pin-hole camera produces a less sharply defined image when the
  • A Pin-hole is larger
  • B Illumination is less
  • C Screen is further from the pin-hole
  • D Object is further from the pin-hole
View Answer & Explanation