300 mL of active ingredient is mixed with distilled water to total 4 L. The final concentration (v/v) is:
A) 75%.
B) 13%.
C) 1.3%.
D) 7.5%.
D
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You have been dispatched to assist a BLS unit on the scene of a crash approximately 10 miles outside town. The BLS crew reports that they have a 55-year-old female involved in a single-vehicle crash. Her blood pressure is 90/60, her heart rate 120, and her respiratory rate 20. She has multiple significant injuries. You are 15 minutes by ground from a Level 1 trauma center. That center does have a
helicopter. What is your best action? A) Call for the helicopter and wait for it to arrive. Provide aggressive treatment until then. B) Call for the helicopter to meet you halfway. C) Do not call for the helicopter, because by the time it would arrive you could almost be at the hospital. D) Call medical control and ask the trauma doctor what you should do.
A physician requests that you provide a patient with exactly 40% O2 at a flow of 60 L/min. Lacking a blender, you must manually mix air and O2 to achieve the desired mixture at the pre-scribed flow
Which of the following air and O2 flows would you select? Air (L/min) O2 (L/min) a. 45 15 b. 15 45 c. 40 20 d. 20 40
Which sampling technique selects the members from the population based on the prior knowledge of an expert?
A. Convenience sampling B. Judgement sampling C. Quota sampling D. Cluster sampling
Which of the following statements regarding positioning of the image receptor is correct?
A) Absence of apical structures results when the image receptor is not placed low enough in the oral cavity. B) Inadequate horizontal angulation will result in less of the crown recorded. C) Excessive vertical angulation will result in overlap error. D) Not placing the image receptor parallel with the occlusal plane results in conecutting.