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6

Thermionic emission is the process whereby?

  • A. β - rays are produced
  • B. holes are produced
  • C. x - rays are produced
  • D. electrons leave a hot element
View Answer & Discuss JAMB 2009
7

Heat is radiated by hot objects in the form?

  • A. x-rays
  • B. light energy
  • C. infrared rays
  • D. solar energy
View Answer & Discuss (2) JAMB 2010
8

The diagram above is the heating curve for a solid, QR is the?

  • A. melting region
  • B. boiling region
  • C. sublimation region
  • D. evaporating process
View Answer & Discuss JAMB 2008
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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9

A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?

  • A. the reaction force of the table on the ice breaks the ice into water molecules
  • B. heat extracted from the ice block makes the ice block cold
  • C. the ice block absorbs heat from the atmosphere and its temperature rises
  • D. the atmosphere absorbs heat from the ice block and its temperature falls
  • E. the ice block absorbs heat from the atmosphere and its temperature remains constant as it melts
View Answer & Discuss (7) WAEC 1989
10

The specific latent heat of vaporization of a substance is always?

  • A. less than its specific latent heat of fusion
  • B. greater than its specific heat of fusion
  • C. equal to its specific latent heat of fusion
  • D. all of the above depending on the nature of the substance
  • E. none of the above
View Answer & Discuss (4) JAMB 1983
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