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Physics 2011 JAMB Past Questions

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16
A perfect emitter or absorber of radiant energy is a
  • A. conductor
  • B. black body
  • C. white body
  • D. red body
View Answer & Discuss (2) JAMB 2011
17
The ground is always cold at night because the
  • A. atmosphere absorbs the sun's energy at night
  • B. earth radiates heat to the atmosphere at night
  • C. sun no longer shine at night
  • D. atmosphere reflects the sun's energy at night
View Answer & Discuss JAMB 2011
18

A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?



[velocity of sound in the air = 330 ms-1]

  • A. 30 s
  • B. 10 s
  • C. 10 s
  • D. 15 s
View Answer & Discuss (8) JAMB 2011
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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19
The phenomenon that shows that increase in pressure lowers the melting point can be observed in
  • A. sublimation
  • B. condensation
  • C. coagulation
  • D. regelation
View Answer & Discuss (1) JAMB 2011
20
A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is
  • A. 900 JK-1
  • B. 90 JK-1
  • C. 100 JK-1
  • D. 200 JK-1
View Answer & Discuss (7) JAMB 2011
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