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1566
A thin film of liquid is trapped between two glass plates. The force required to pull the plates apart will increase if the
  • A. surface tension of the liquid is reduced
  • B. perpendicular distance between the plates is increased
  • C. area of the liquid surface in contact with the plates is increased
  • D. pressure of the air is decreased
View Answer & Discuss (5) JAMB 1989
1567
A block-and-tackle system is used to lift a load of 20N through a vertical height of 10m. if the efficiency of the system is 40%, how much work is done against friction?
  • A. 80J
  • B. 120J
  • C. 300J
  • D. 500J
View Answer & Discuss (9) JAMB 1989
1568
Which of the following devices are used to measure pressure? i. Aneroid barometer. ii. hydrometer. iii. hygrometer. iv. manometer.
  • A. i and iii
  • B. ii and iii
  • C. iii and iv
  • D. i and iv
View Answer & Discuss (2) JAMB 1989
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1569
A piece of wood of mass 40g and uniform cross-sectional area of 2cm2 floats upright in water. The length of the wood immersed is
  • A. 30cm
  • B. 40cm
  • C. 20cm
  • D. 2cm
View Answer & Discuss (8) JAMB 1989
1570
The pressure on the gas of constant gas thermometer at the ice point is 325mm of mercury and at the steam point is 875mm of mercury. Find the temperature when the pressure of the gas is 190mm of mercury
  • A. 30k
  • B. 243k
  • C. 300k
  • D. 3003k
View Answer & Discuss (13) JAMB 1989
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