Which of the following statements about radiant heat is/are not correct?
I. radiant heat cannot travel through a vacuum II. rough surfaces emit radiant heat more than polished surfaces III. Dark surfaces absorb radiant heat more than bright surfaces A. I only B. II only C. III only D. I & II only E. II & III only Correct Answer:...
Which of the following best explains a person suffers more severe burns when his skin is exposed to steam than when boiling water is poured onto his skin?
A. steam is at a higher temperature than boiling water B. steam posses greater heat energy per unit-mass than boiling water C. steam spreads more easily over a wider area of the skin than boiling water D. steam penetrates more easily over a wider area of the skin than...
In which of the following is the expansion of solids a disadvantage?
A. the fitting of wheels in rims B. fire alarms C. the thermostat D. the bimetallic thermometer E. the balance wheel of a watch Correct Answer: Option E – the balance wheel of a watch
Which of the following is a reason why a concrete floor feels colder to the bare feet than a mat on the same floor during the rainy season?
A. A mat is a better conductor of heat than the feet B. Mat losses heat to the bare feet at a faster rate than concrete floor C. Mat losses heat to the bare feet while the concrete floor extracts heat from them D. Concrete floor is a better conductor of heat than the...
A given mass of gas has a pressure of 80Nm−² at a temperature of 47°C. If the temperature is reduced to 27°C with the volume remaining constant, the new pressure is
A. 46.0 Nm−² B. 75.0 Nm−² C. 80.0 Nm−² D. 85.3 Nm−² E. 139.4 Nm−² Correct Answer: Option B – 75.0 Nm−² Explanation P1/T1 = P2/T2 80/(273+47) = P1/(273+27) = 75Nm−²Products
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