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69 multiple-choice questions and 13 flashcards on Scene Size-Up and Safety, about 16% of the EMT Basic NREMT bank. Every one carries a written rationale.
Scene Size-Up and Safety is one of 5 chapters in CoStudy's EMT Basic (NREMT) bank, and it holds 69 of the bank's 433 multiple-choice questions — roughly 16% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
10 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
Dispatch reports a two-vehicle collision on a highway with one vehicle on its roof and reports of people trapped. Based on this information alone, which additional resource is MOST important to request while still en route?
Answer: A — Rescue or extrication capability and additional transporting units
A) Correct - entrapment predicts prolonged extrication and multiple patients, and both extrication capability and additional ambulances take time to arrive, so they are requested early. B) Media management is not a patient-care priority and does not need to be requested en route. C) A routine fuel leak at a collision is handled by the fire suppression crew; a full hazmat response is a later, conditional request. D) Supervisors do not complete crew documentation and add nothing to scene capability here.
The FIRST-arriving EMS unit at a multiple-casualty incident should:
Answer: C — Establish command, size up the scene, and report an estimate of patients and resources needed
C) Correct — the first unit assumes command, sizes up the incident, and communicates the scope and resource needs so the rest of the response can be built. A) Committing to one patient removes the only crew able to organize the scene, however severe that patient's injuries appear. B) Transporting the first two patients found leaves the scene uncoordinated and often moves low-priority patients ahead of critical ones. D) Command is assumed by the first unit on scene; waiting delays the entire response.
Suspected meningitis with rash and stiff neck — best PPE?
Answer: C — Droplet precautions including mask for provider and patient
A) Insufficient. C) Correct — most bacterial meningitis spread by droplet. B) Some pathogens may warrant N95 per local policy. D) Not the primary issue.
Dispatch information should influence PPE selection because:
Answer: A — It allows the crew to don appropriate protection before patient contact
A) Correct - body substance isolation decisions begin with the dispatch information so that protection is already in place on approach rather than after an exposure. B) The destination is decided later from patient findings and has nothing to do with PPE selection. C) Dispatch data is frequently incomplete, so protection is upgraded once the crew can see the patient. D) Mechanism does belong in the report, but that is a documentation matter and not the reason dispatch data drives PPE choice.
A restrained driver strikes a tree at highway speed and the steering wheel is deformed. This mechanism should raise the HIGHEST suspicion for which injury pattern?
Answer: C — Blunt chest trauma with underlying cardiac and pulmonary injury
C) Correct - a deformed steering wheel indicates chest impact and directs the EMT to look for rib fractures, pulmonary contusion, and myocardial injury. A) Calcaneus and lumbar fractures follow axial loading in falls from height. B) Dashboard impact drives the femur posteriorly and is suggested by knee imprints, not steering wheel deformity. D) Cervical injury is possible, but the pattern this mechanism names is the chest, and injuries at highway speed are rarely isolated.
An EMT crew arrives at a single-vehicle crash at night. A car has struck a utility pole, and a power line is lying across the trunk. The driver is awake and waving for help. Which action is MOST appropriate?
Answer: B — Remain a safe distance away, keep bystanders back, and request the power company
B) Correct — downed lines are a specialist hazard; the EMT's role is to isolate the area, keep everyone out, and summon the utility and fire resources. A) The entire vehicle and surrounding ground may be energized, so no approach direction is safe. C) Tempting because "wood does not conduct," but this is a common misconception — field-improvised line handling is not within EMT scope. D) Exiting is a last-resort action taught only for immediate life threat such as fire, and stepping down risks completing a circuit; the default is to have the occupant stay put.
Compared with blunt trauma, penetrating trauma is BEST characterized during size-up as:
Answer: B — Injury concentrated along the path of the object, though internal damage may exceed the visible wound
A) Wrong. Severity depends on which structures lie along the path, not on the category of mechanism. B) Correct. Penetrating mechanisms injure the structures along the object's track, and the surface appearance regularly underestimates the internal damage. C) Wrong. This overstates a real nuance; spinal precautions are applied selectively based on findings rather than ruled out by category. D) Wrong. Assuming the wound reveals the injury is a common and dangerous misconception.
A crew responds to a rollover in a ravine 200 feet below the roadway with two patients. Which resource request is MOST appropriate during size-up?
Answer: C — Rescue personnel for technical access plus additional transport units
C) Correct - the controlling barrier here is access, so technical rescue is needed alongside enough transport capacity for the two patients. A) Adds transport but ignores the access problem that will delay everything else. B) True that traffic control helps and it should be requested, but it does not address the controlling problem. D) Aviation may be appropriate later, but requesting it before any patient information exists is premature and it does not solve the access problem.
When providing care at a crime scene, the EMT should observe all of the following EXCEPT:
Answer: C — Cut clothing through existing bullet or knife holes to preserve the wound pattern
C) Correct answer to an EXCEPT stem - clothing is cut around defects rather than through them, so the evidentiary pattern of the hole is preserved for investigators. A) This is correct practice, since minimizing contact limits contamination of evidence. B) This is correct practice, since a common entry and exit path limits disturbance of the scene. D) This is correct practice, since documenting what was moved lets investigators reconstruct the original scene.
An EMT responds to a residence and finds an older adult confused in a chair. On the table are a nebulizer, several inhalers, and a home oxygen concentrator. These findings BEST help the EMT to:
Answer: D — Form an impression of the nature of illness
D) Correct — home equipment and medications are scene clues that shape the suspected nature of illness, here a chronic respiratory condition. A) Mechanism of injury applies to trauma; this is a medical call. B) Code status requires documentation, not equipment on a table. C) The presence of medications does not establish that any were taken in excess.
4 cards from the 13 in this chapter.
What standard precautions should an EMT consider on scene?
Gloves on every patient contact, plus eye protection, mask, and gown when splashing, airway procedures, or airborne illness is likely.
What is the safest approach to a patient with a suspected spinal injury during size-up?
Approach from the front so the patient does not turn the head, identify yourself, and instruct them to hold still while manual stabilization is applied.
What are the components of the scene size-up?
Standard precautions, scene safety, mechanism of injury or nature of illness, number of patients, and need for additional resources.
What should an EMT do when the scene is unsafe?
Do not enter. Stage at a safe distance, request law enforcement or the appropriate resource, and wait until the scene is declared safe.
These are a sample. The full Scene Size-Up and Safety chapter runs 82 items with per-chapter progress tracking, on the web and in the iOS app.
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