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316
An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water.


[specific heat capacity of water = 4.2 x 103 jkg-1 k-1]
  • A. 1.05 x 103s
  • B. 1.05 x 105s
  • C. 1.05 x 102s
  • D. 1.05 x 104s
View Answer & Discuss (6) JAMB 2006
317

The thermos flask is designed to?

  • A. prevent heat loss or gain by conduction, convection and radiation
  • B. store hot tea or water
  • C. prevent heat gain by conduction, convection and radiation
  • D. prevent heat lost by conduction, convention and radiation
View Answer & Discuss (8) JAMB 2006
318

what is likely to happen if the glass of a thermometer expands more upon heating than the liquid inside?

  • A. the glass will break
  • B. the glass will shrink
  • C. the liquid will rise up in the stem
  • D. the liquid will go down in the stem
View Answer & Discuss (8) JAMB 2006
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319

A drop of petrol makes a finger colder than a drop of water would because?

  • A. petrol takes its latent heat of veporization from the finger
  • B. petrol takes its latent heat of fusion from the finger
  • C. water is more viscious than petrol
  • D. water has higher surface tension dan petrol
View Answer & Discuss (15) JAMB 2006
320

A cell of internal resistance r is connected to an external resistor R. The condition for maximum power transfer is?

  • A. R < r
  • B. R = r
  • C. R = 2r
  • D. R > r
View Answer & Discuss (5) JAMB 2006
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