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Wednesday, 20 May 2026
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Physics Past Questions and Answers

Jamb 1985 Physics Questions

Question 41:
On which of the following does the operation of a moving coil ammeter depend? i. Electromagnetic induction ii. Force on a carrying-current conductor iii. Magnetic effect of an electric current
  • A I only
  • B Ii only
  • C Iii only
  • D Ii and iii only
  • E I,ii and iii
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Question 42:
Which of the following statements is NOT correct?
  • A A galvanometer can be converted to an ammeter with a different range by connecting a high resistance in series
  • B An electric current always produces a magnetic field
  • C Maxwell's screw rule states that if a corkscrew moves inthe direction of the current, the hand turns in the direction of the lines of force
  • D Electromagnets are used in electric bells and telephone recievers
  • E The lines of force round a straight current carrying conductor are circular
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Question 43:
A transformer has a primary coil with 500 turns and a secondary coil with 2500 turns. When the voltage input to the primary coil is 120V, the output is
  • A 6000V
  • B 600V
  • C 240V
  • D 60V
  • E 24V
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Question 44:
Which of the following statements about electrolysis is NOT correct?
  • A The substances in solution in the electrolyte become ionized
  • B Ions are electrically charged and are attracted towards electrodes when a potential difference is applied
  • C Ions may be discharged at the electrodes, forming bubbles or deposits
  • D The mass deposited depends upon the length of time for which current flows
  • E The mass of gas set free or metal deposited is proportional to the square of the current
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Question 45:
Which of the following statements is NOT correct?
  • A The average range of distinct vision for a normal eye is from the far distance (infinity) up to about 25cm in front of the eye
  • B Longsighted people have difficulty in making the eye lense sufficiently powerful to focus on nearby objects
  • C Shortsighted people cannot accommodate distant objects
  • D Longsighted people need diverging spectacle lenses
  • E A person with long sight has his eye-ball too short and the image of an object is therefore formed behind the retina
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