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Physics 1979 JAMB Past Questions

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26

A capacitor and a resistor are connected in series with each other and in series with an accumulator of negligible internal resistance. The potential across the terminals of the capacitor is

  • A. twice the e.m.f of the accumulator
  • B. less than the e.m.f by the potential drop across the resistor
  • C. zero
  • D. the same as the e.m.f.
  • E. greater than the e.m.f
View Answer & Discuss (6) JAMB 1979
27

Which of the following statements is true? The frequency of a vibrating string is

  • A. proportional to its length
  • B. inversely proportional to the tension within it
  • C. proportional to the aptitude of vibration
  • D. inversely proportional to its cross-section
  • E. proportional to the square root of the tension within it
View Answer & Discuss (3) JAMB 1979
28
An air bubble rises from the bottom to the top of a water dam which is 40m deep. The volume of the bubble just below the surface is 2.5cm3. Find its volume at the bottom of the dam, if atmospheric pressure is equivalent to 10m water
  • A. 0.0cm3
  • B. 2.0cm3
  • C. 1.6cm3
  • D. 0.625cm3
  • E. 0.5cm3
View Answer & Discuss (6) JAMB 1979
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29
Which of the following electromagnetic waves has the shortest wavelength?
  • A. Radio waves
  • B. X-rays
  • C. Infra-red
  • D. Blue light
  • E. Ultraviolet
View Answer & Discuss (11) JAMB 1979
30
All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
  • A. 120J
  • B. 60Jg-1
  • C. 120Jg-1
  • D. 1500J
  • E. 1500Jg-1
View Answer & Discuss (3) JAMB 1979
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