Why are gases such as helium considered extremely stable?
A) They have a full valence shell.
B) They are the most abundant in nature.
C) They have a short half-life.
D) They are in the top portion of the periodic table.
A
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Which of the following statements regarding steel as a construction material is MOST accurate?
A. Most fires create temperatures hot enough to melt steel. B. When exposed to heat, steel loses strength at a rapid rate. C. Steel with less mass requires higher temperatures before it will fail. D. Steel's loss of strength when exposed to heat is the most significant characteristic to firefighters.
Which of the following types of fire doors are motor-driven and frequently used if a fire-rated partition is required and the designer does not wish to provide a fixed wall?
A. Swinging B. Rolling steel C. Horizontal-sliding D. Horizontal-folding