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2111

The average kinetic energy of the molecules of a perfect gas is directly proportional to the

  • A. pressure exerted by the gas
  • B. volume of the gas molecule
  • C. kelvin temperature of the gas
  • D. volume of the gas container
  • E. celcius temperature of the gas
View Answer & Discuss (4) WAEC 1998
2112
How much heat is emitted when a body of mass 200g cools from 37oC to 31oC? (specific heat capacity of the body = 0.4Jg-1K-1,)
  • A. 4800J
  • B. 1200J
  • C. 480J
  • D. 202J
  • E. 80J
View Answer & Discuss WAEC 1998
2113
If the cubic expansivity of brass between 27oC and 100oC is 5.7 x 10-5K-1, What is its linear expansivity?
  • A. 2.85 x 10-5K-1
  • B. 1.90 x 10-5K-1
  • C. 1.86 x 10-5K-1
  • D. 1.70 x 10-5K-1
  • E. 1.63 x 10-5K-1
View Answer & Discuss (1) WAEC 1998
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2114
Air at temperature 527oC and pressure 30 atmospheres is admitted into the cylinder of an engine. Calculate the pressure of the gas when it has expanded to 5 times its volume and cooled to 127oC as it leaves the engine
  • A. 1.5 atmospheres
  • B. 2.5 atmospheres
  • C. 3.0 atmospheres
  • D. 12.8 atmospheres
  • E. 15.0 atmospheres
View Answer & Discuss (1) WAEC 1998
2115
The inside of a vacuum flak is usually coated with silver to reduce heat loss by
  • A. evaporation
  • B. radiation
  • C. conduction
  • D. convention
  • E. condensation
View Answer & Discuss (6) WAEC 1998
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