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Physics 1987 JAMB Past Questions

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31
Four lenses are being considered for use as a microscope objective. Which of the following focal lengths is most suitable?
  • A. -5mm
  • B. +5mm
  • C. -5cm
  • D. +5cm
View Answer & Discuss (8) JAMB 1987
32

If the angle of declination in a place is 10oE, calculate the true geographic bearing if the compass reads N40oE

  • A. N50oE
  • B. N40oE
  • C. N30oE
  • D. N25oE
View Answer & Discuss (9) JAMB 1987
33
Two capacitance of 6\(\mu\)F and 8\(\mu\)F are connected in series. What additional capacitance must be connected in series with this combination to give a total of 3\(\mu\)F
  • A. 3\(\mu\)F
  • B. 16\(\mu\)F
  • C. 24\(\mu\)F
  • D. 30\(\mu\)F
View Answer & Discuss (13) JAMB 1987
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34

When a transformer has more secondary windings than primary windings, it?

  • A. has a smaller secondary current
  • B. has a greater power output
  • C. is a step-down transformer
  • D. increases the total energy output
View Answer & Discuss (22) JAMB 1987
35
A current of 0.5A flows through a resistor when connected to a 40-V battery. How much energy is dissipated in 2 minutes?
  • A. 1200J
  • B. 1500J
  • C. 2400J
  • D. 96000J
View Answer & Discuss (3) JAMB 1987
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