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281

The temperature of glass vessel containing 100cm3 of mercury is raised from 10oC to 100oC. Calculate the apparent cubic expansion of the mercury. (Real cubic expansivity of mercury = 1.82 x 10-4K-1) (Cubic expansivity of glass = 2.4 x 10-5K-1)

  • A. 0.52cm3
  • B. 1.42cm3
  • C. 1.87cm3
  • D. 5.22cm3
  • E. 14.22cm3
View Answer & Discuss (14) WAEC 1995
282
An iron rod of mass 2kg and at a temperature of 280oC is dropped into some quantity of water initially at a temperature of 30oC. lf the temperature of the mixture is 70oC, calculate the mass of the water. (Neglect heat losses to the surroundings). Specific heat capacity of iron = 460 J kgK) (Specific heat capacity of water = 4200 Jkg K)
  • A. 0.58kg
  • B. 0.77kg
  • C. 1.15kg
  • D. 1.50kg
  • E. 2.04kg
View Answer & Discuss (5) WAEC 1995
283

How much heat is required to convert 20 g of ice at 0oC to water at the same temperature? (Specific latent heat of ice = 336 J g-1)

  • A. 1.35 x 103J
  • B. 5.38 x 103J
  • C. 6.72 x 103J
  • D. 7.06 x 103J
  • E. 8.06 x 103J
View Answer & Discuss (3) WAEC 1995
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284

When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that in Q. lf the masses of P and Q are the same, calculate the ratio of the specific heat capacities of Q to P.

  • A. 4 : 1
  • B. 2 : 1
  • C. 1 : 1
  • D. 1 : 2
  • E. 1 : 4.
View Answer & Discuss (11) WAEC 1995
285
A ray of light is incident on mirror m1 and after reflection is incident on mirror m2 as shown in the diagram, calculate the angle of reflection of the ray at mirror m2
  • A. 120o
  • B. 90o
  • C. 60o
  • D. 45o
  • E. 30o
View Answer & Discuss (9) WAEC 1995
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