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926

A platinum-resistance thermometer has a resistance of 5Ω at 0°C and 9Ω at l00°C. Assuming that resistance changes uniformly with temperature, calculate the resistance of the thermometer when the temperature is 45°C.

  • A. 13.9 Ω
  • B. 8.9 Ω
  • C. 6.8 Ω
  • D. 3.2 Ω
  • E. 1.8 Ω
View Answer & Discuss (16) WAEC 1996
927
The linear expansivity of a metal P is twice that of another metal Q. When these materials are heated through the same temperature change, their increase in length is the same. Calculate the ratio of the original length of P to that of Q.
  • A. 1:4
  • B. 1:2
  • C. 2:1
  • D. 4:1
  • E. 6:1
View Answer & Discuss (7) WAEC 1996
928
The pressure of a fixed mass of gas is 2.0 x 105Nm-2 at a known temperature. Assuming that the temperature remains constant, what will be the pressure of the gas if its volume is halved?
  • A. 1.0x105Nm-2
  • B. 2.0X105Nm-2
  • C. 3.0x105Nm-2
  • D. 4.0 x105Nm-2
  • E. 5.0 x105Nm-2
View Answer & Discuss (11) WAEC 1996
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929

Which of the following statements is not correct?

  • A. Heat energy can be transformed into mechanical energy
  • B. That total heat content of a body is the sum of the kinetic energies of its molecules
  • C. lf a body is heated, its molecules move faster.
  • D. lf a body is cooled, molecular movement remains constant.
View Answer & Discuss (11) WAEC 1996
930
A 400W immersion heater is used to heat a liquid of mass 0.5kg. lf the temperature of the liquid increases by 2.5oC in one second, calculate the specific heat capacity of the liquid (Neglect heat losses to the surroundings)
  • A. 80 Jkg-1K-1
  • B. 320Jkg-1K-1
  • C. 500Jkg-1K-1
  • D. 1200J kg-1K-1
  • E. 2000J kg-1K-1.
View Answer & Discuss (8) WAEC 1996
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