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1646

Hot water is added to three times its mass of water at 10oC and the resultant temperature is 20oC. What is the initial temperature of the hot water?

  • A. 100oC
  • B. 80oC
  • C. 50oC
  • D. 40oC
View Answer & Discuss (15) JAMB 1987
1647
22,000J of heat is required to raise the temperature of 1.5kg of paraffin from 20oC to 30oC. Calculate the specific heat capacity of paraffin.
  • A. 1466Jkg-1 oC-1
  • B. 2933Jkg-1 oC-1
  • C. 4400Jkg-1 oC-1
  • D. 5866Jkg-1 oC-1
View Answer & Discuss (5) JAMB 1987
1648
In which of the following are the substance arranged in descending order of their thermal conductivities?
  • A. copper, steel, glass
  • B. steel, copper, glass
  • C. steel, glass, copper
  • D. copper, glass, steel
View Answer & Discuss (3) JAMB 1987
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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1649

The vacuum in a thermos flask helps to reduce heat transfer by?

  • A. convection and radiation
  • B. convection and conduction
  • C. conduction and radiation
  • D. radiation only
View Answer & Discuss (5) JAMB 1987
1650
Which of the following phenomena explains the fact that a house whose roof is coated with white paint will be cooler in the hot season than one coated with black paint ?
  • A. conduction
  • B. convection
  • C. refraction
  • D. reflection
View Answer & Discuss (17) JAMB 1987
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