Search SchoolNGR

Monday, 02 November 2026
Register . Login

Physics Past Questions and Answers

Jamb 1984 Physics Questions

Question 26:
Which of the following statements about the compound microscope and astronomical telescope is (are) correct? i. the final image of a compound microscope is located at infinity ii. the final image of the astronomical telescope is always erect iii. the objective lens of a compound microscope has a very short focal length
  • A I only
  • B Ii only
  • C Iii only
  • D I and iii
  • E Ii and iii
View Answer & Explanation
Question 27:
A coin is placed at the bottom of a cube of glass tern thick. If the refractive index of the glass is \(\mu\), how high does the coin appear to be raised to an observer looking perpendicularly into the glass?
  • A \(\frac{1}{t - \mu}\)
  • B \(\frac{t(\mu - I)}{\mu}\)
  • C T (1 + \(\frac{1}{\mu}\))
  • D -\(\mu\)
  • E \(\mu\)t
View Answer & Explanation
Question 28:
The electromotive force obtained from a simple dynamo may be increased by
  • A Increasing the cross-sectional area of the coil
  • B Winding the coil on a soft-iron armature so as to decrease the magnetic flux through the coil
  • C Increasing the speed of rotation
  • D Making the field magnet longer
  • E Using low-resistance copper coils
View Answer & Explanation
Question 29:
A gun of mass 2.0kg fires a bullet of mass 16 x 10 -2kg due East. If the bullet leaves the nozzle of the gun with a velocity of 150ms-1, what is the recoil velocity of the gun?
  • A 150ms<sup style='font-size: smaller;'>-1</sup> due West
  • B 1.2 x 10<sup style='font-size: smaller;'>-4</sup>ms<sup style='font-size: smaller;'>-1</sup> due West
  • C 1.2ms<sup style='font-size: smaller;'>-1</sup> due West
  • D 1.2ms<sup style='font-size: smaller;'>-1</sup> due East
  • E 150ms<sup style='font-size: smaller;'>-1</sup> due East
View Answer & Explanation
Question 30:
Which of the following is a correct explanation of the inertia of a body?
  • A Ability to overcome the earth's gravity
  • B Reluctance to stop moving
  • C Readiness to start moving
  • D Reluctance to start moving and its readiness to stop moving once it has begun to move
  • E Reluctance to start moving its reluctance to stop moving once it has begun to move
View Answer & Explanation