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Physics 1985 JAMB Past Questions

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41
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
View Answer & Discuss (3) JAMB 1985
42
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
View Answer & Discuss (4) JAMB 1985
43
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
View Answer & Discuss (1) JAMB 1985
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44
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
View Answer & Discuss (3) JAMB 1985
45

Which of the following features is NOT a characteristic of natural radioactivity?

  • A. Radioactivity is a nuclear phenomenon
  • B. Radioactivity is exhibited only by elements of mass number greater than 206
  • C. The radioactivity of an element is affected by electric and magnetic fields in the surroundings
  • D. Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
  • E. The radioactive element is transformed into a new element
View Answer & Discuss (18) JAMB 1985
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