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5 X 10\(^{-3}\)kg of liquid at its boiling point is evaporated in 20s by the heat generated by a resistor of 2\(\Omega\) when a current of 10A is used. The specific latent heat of vaporization of the liquid is

A. 8.0 x 10\(^4\)Jkg\(^{-1}\)
B. 8.0 x 10\(^5\)Jkg\(^{-1}\)
C. 8.0 x 10\(^6\)Jkg\(^{-1}\)
D. 8.0 x 10\(^7\)Jkg\(^{-1}\)

View Answer & Discuss (8) JAMB 2024

If the S.V.P of water vapour was 13.5mmHg at 33ºC and 7.3mmHg at 7ºC. Find the percentage relative of the air on a day when average air temperature was 33ºC and dew point was 7ºC.

A. 55%
B. 60%
C. 54%
D. 51%

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If the rate of evaporation is y, and the rate of condensation is x, then, a vapour is saturated when

A. x > y
B. x
C. x = y
D. x \(\leq\) y

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Newton's law of cooling is valid only for a

A. small temperature range
B. large temperature range
C. free flow range
D. presence of heat source

View Answer & Discuss (5) JAMB 2024

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