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Physics JAMB Past Questions

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1306
A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is
  • A. 4%
  • B. 5%
  • C. 40%
  • D. 50%
  • E. 80%
View Answer & Discuss JAMB 1983
1307
If the normal atmospheric pressure in a laboratory supports a column of mercury 0.76m high and the relative density of mercury is 13.8, then the height of water column which atmospheric pressure will support in the same laboratory at the same time is
  • A. 0m
  • B. 10m
  • C. 13m
  • D. 14m
  • E. 18m
View Answer & Discuss (8) JAMB 1983
1308

An electric current of 3Aflowing through an electric heating elements of resistance 20 embedded in 1,000g of an oil raises the temperature of the oil by 10oC in 10 seconds then the specific heat capacity of the oil is

  • A. 1.8Jg-1oC
  • B. 0.6Jg-1oC
  • C. 0.18Jg-1oC
  • D. 18Jg-1oC
  • E. 0.06Jg-1oC
View Answer & Discuss (8) JAMB 1983
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1309

The difference of potential between the terminals of cells is 2.2 volts. When a 4ohm resistor is connected across the terminals of this cells, the potential difference is 2 volts. What is the internal resistance of the cell?

  • A. 0.10 ohms
  • B. 0.25ohms
  • C. 0.40ohms
  • D. 2.50ohms
  • E. 4.00ohms
View Answer & Discuss (11) JAMB 1983
1310
Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?
  • A. heat \( \to \) light \( \to \) sound \( \to \) kinetic
  • B. kinetic \( \to \) light \( \to \) heat \( \to \) electricity
  • C. heat \( \to \) kinetic\( \to \) electricity \( \to \) heat \( \to \) light
  • D. electricity \( \to \) kinetic \( \to \) heat v light
  • E. heat \(\ to \) sound \( \to \) kninetic v electricity
View Answer & Discuss (4) JAMB 1983
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