Physics Past Questions

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871

An air bubble of volume 2 cm\(^3\) is formed 20m under water. What will be its volume when it rises to just below the surface of the water if the atmospheric pressure is equivalent to a height of 10m of water?

A. 6cm³
B. 4cm³
C. 3cm³
D. 2cm³
E. 1cm³

View Answer & Discuss (6) WAEC 1995

872

The pressure of a given mass of gas changes from 200 Nm2 to 100 N m2, while its temperature drops from 127oC to - 73oC. Calculate the radio of the final volume of the gas to its initial volume.

A. 2.4:1
B. 2.0:1
C. 1.2:1
D. 1.0:1
E. 1.0:2

View Answer & Discuss (7) WAEC 1995

873

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

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874

An iron rod of mass 2kg and at a temperature of 280^oC is dropped into some quantity of water initially at a temperature of 30^oC. lf the temperature of the mixture is 70^oC, 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)