There are 12 correct answers in the following multiple choice questions (some questions have multiple answers that are correct). To attain a perfect s
There are 12 correct answers in the following multiple choice questions (some questions have multiple answers that are correct). To attain a perfect score on the quiz, all correct answers must be given. Each correct answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1 point, and each additional answer beyond the correct number of answers reduces the score by 1 point. Percentage score on the quiz is based on the total number of correct answers.
\r\n4.1 Which one of the following metals has the lowest density: (a) aluminum, (b) copper, (c) magnesium, or (d) tin?
\r\n4.2 The thermal expansion properties of polymers are generally (a) greater than, (b) less than, or (c) the same as those of metals?
\r\n4.3 In the heating of most metal alloys, melting begins at a certain temperature and concludes at a higher temperature. In these cases, which of the following temperatures marks the beginning of melting: (a) liquidus or (b) solidus?
\r\n4.4 Which one of the following materials has the highest specific heat: (a) aluminum, (b) concrete, (c) polyethylene, or (d) water?
\r\n4.5 Copper is generally considered easy to weld because of its high thermal conductivity: (a) true or (b) false?
\r\n4.6 The mass diffusion rate dm/dt across a boundary between two different metals is a function of which of the following variables (four best answers): (a) concentration gradient dc/dx, (b) contact area, (c) density, (d) melting point, (e) thermal expansion, (f) temperature, and (g) time?
\r\n4.7 Which of the following pure metals is the best conductor of electricity: (a) aluminum, (b) copper, (c) gold, or (d) silver?
\r\n4.8 A superconductor is characterized by which of the following (one best answer): (a) high conductivity, (b) resistivity properties between those of conductors and semiconductors, (c) very low resistivity, or (d) zero resistivity?
\r\n4.9 In an electrolytic cell, the anode is the electrode that is (a) positive or (b) negative