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1846
Which of the following statements is NOT true? Thermostats are used to control the temperature of
  • A. pressure cookers
  • B. laundry irons
  • C. hot water storage tanks
  • D. aquaria for tropical fish
  • E. heated apartments
View Answer & Discuss (6) JAMB 1982
1847
250g of lead at 170oC is dropped into 100g of water at 0oC. If the final temperature is 12oC, the specific heat of lead is (specific heat of water is 4,200J/kgoC)
  • A. 39.5J/kgoC
  • B. 50.4J/kgoC
  • C. 127.6J/kgoC
  • D. 154.6J/kgoC
  • E. 173.4J/kgoC
View Answer & Discuss (4) JAMB 1982
1848
An object 15cm high is 30cm from pin-hole camera. If the height of the image formed at the back of the camera is 10cm, the image distance is
  • A. 20cm
  • B. 45cm
  • C. 54cm
  • D. 63cm
  • E. 70cm
View Answer & Discuss (2) JAMB 1982
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1849
The combination of sound waves with different frequencies is known as
  • A. interference
  • B. diffraction
  • C. superposition
  • D. forced vibration
  • E. resonance
View Answer & Discuss (10) JAMB 1982
1850

Why does a piece of cork float on water?

  • A. there is no upthrust on it when completely immersed in water
  • B. the upthrust on it when completely immersed in water is greater than its weight in air
  • C. the upthrust on it when completely immersed in water is less than its weight in air
  • D. its specific gravity is greater than that of water
  • E. its specific gravity is the same as that of water
View Answer & Discuss (14) JAMB 1982
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