Passage V

Researchers conducted an experiment to determine the factors affecting heat flow. In each trial, one or more blocks of a particular material was (were) placed between two walls at constant temperatures T1 and T2 in one of the configurations shown in Figure 1. Heat was transferred through the block(s) from the hotter wall to the cooler wall. This heat flow, measured in joules per second (J/sec), is shown in Table 1.

(Note: All blocks used in the experiment were identical in size and shape. In each configuration, the contact area was the surface area of the end of the block(s) against one wall.)

28. Materials differ in their thermal conductivities: the higher the thermal conductivity, the greater the heat flow through the material. According to Trials 6 through 11, which of the following statements about relative thermal conductivities is NOT true?

Answer and Explanation

Your Answer is

Correct Answer is H

Explanation

The better the thermal conductivity, the greater the heat flow.

The H option is wrong to say that the thermal conductivity of steel is higher than that of aluminum, because table 1 lists that the heat flow corresponding to steel is 31 J/sec, which is less than the heat flow of aluminum 140 J/sec