49 A mouth-to-mask ventilation device consists of a mask that fits over the victim’s face, a one-way valve, and a
mouthpiece through which the rescuer breathes. Because mouth-to-mask devices prevent direct contact with the
victim, they reduce the risk of .
(A)foreign body airway obstructions
(B)transmitting infectious diseases
(C)gastric distention
(D)cardiac arrests

41 As early as 1735, Englishman Obadiah Wild secured a flame retardant technology patent forcombustible substances from flaming.(A)preserving (B)predicting (C)pretending (D)preventing

42 Firefighters are instructed to take the stairs when possible and take in elevators, including inspectingopen shafts for smoke and stopping at least two floors below the fire to walk the rest of the way.(A)precedence (B)presumptions (C)precautions (D)preparation

43 There are two types of heat detectors. One type senses a fixed temperature that is considered to be indicative of afire. The other senses .(A)products of combustion (B)a rate of rise in temperature(C)the decrease of an ionized current (D)monochromatic light beams

44 Most deaths resulting from fires do not result from burns. Nearly two thirds of all fire-related deaths resultfrom of carbon monoxide, smoke or toxic gases, and asphyxiation.(A)inhalation (B)ingredients (C)deficiencies (D)detoxication

45 What type of fires, which produce significant yields of CO, can lead to incapacitation in roughly 1 to 2 hours intypical dwelling spaces?(A)Smoldering (B)Premixed (C)Diffusion (D)Torch

46 Just before World War I, a new agent, methyl bromide, was introduced in Europe for fire suppression purposes.This agent was extremely effective and outperformed CO2 on both flammable liquids and, because of its poorconductivity, fires.(A)pool (B)water reactive (C)electrical (D)reactive metal

47 Although production of Halon 1301 and Halon 1211 was discontinued in 1994, systems andextinguishers were permitted to remain in service until suitable replacement agents were available.(A)substitute (B)existing (C)alternative (D)complement

48 Hydraulic-powered tools such as hydraulic cutters and spreaders are usually used in vehicle , but canalso be used in some forcible entry situations.(A)strands (B)repairs (C)stagnation (D)extrication

50 A charred V-pattern on a wall indicates that fire spread up and out from something at the base of the V, while aninverted V-pattern on a wall could indicate that a flammable liquid was used along the base of the wall to set thefire intentionally. A fire burning across a wide area at the floor level can funnel into a thermal column as it ,creating the inverted-V pattern.(A)filters (B)snuffs (C)exposes (D)rises

51 Secondary contamination occurs when a person or object transfers the contamination or the source ofcontamination to another person or object by . In such cases, fire fighters may become contaminatedand if they subsequently handle tools and equipment, and touch door handles or other responders, they willspread the contamination.(A)water spray (B)chemical reaction (C)airborne infections (D)direct contact

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