Nursing Elites

1. When a person pushes a box across the floor, which of the following forces is NOT doing work?

• A. The person's pushing force
• B. The normal force from the floor
• C. The gravitational force on the box
• D. The frictional force between the box and the floor

Correct answer: B

Rationale: The normal force from the floor is perpendicular to the direction of motion of the box, so it does not contribute to the work being done. Work is only done by forces acting in the direction of motion of an object. In this case, the normal force is acting at a right angle to the motion, hence it does not perform any work on the box. The person's pushing force, the gravitational force, and the frictional force are all acting in the direction of motion of the box, so they contribute to the work being done in moving the box across the floor.

2. Which of the following sentences correctly uses commas to set off a non-essential element?

• A. The teacher, who lives next door, will visit our class next week.
• B. The teacher who lives next door will visit our class next week.
• C. The teacher, who, by the way, lives next door, will visit our class next week.
• D. The teacher will visit our class next week, who lives next door.

Correct answer: A

Rationale: The correct answer is A. In this sentence, the phrase 'who lives next door' is a non-essential element providing additional information about the teacher. It is correctly set off by commas. Choice B does not use any commas to set off the non-essential element, making the information essential to the sentence. Choice C uses an unnecessary comma before 'who,' which disrupts the flow of the sentence. Choice D incorrectly places the non-essential element at the end of the sentence without appropriate commas, making it less clear and concise.

3. What is the neural pathway that triggers a reflex action?

• A. Reflex loop
• B. Reflex arc
• C. Neural pathway
• D. Reflex reaction

Correct answer: B

Rationale: The correct answer is 'B: Reflex arc.' A reflex arc is the neural pathway that triggers an automatic, involuntary reflex action in response to a stimulus. It involves sensory neurons, interneurons in the spinal cord, and motor neurons, allowing for a rapid response without conscious thought. Choice A, 'Reflex loop,' is incorrect as the term commonly used is 'Reflex arc' to describe this neural pathway. Choice C, 'Neural pathway,' is too general and does not specifically refer to the pathway involved in reflex actions. Choice D, 'Reflex reaction,' is not the commonly accepted term to describe the neural pathway that triggers reflex actions.

4. Which of the following, if true, would most seriously undermine the explanation proposed by the author in Passage I, third paragraph?

• A. An instance of lethal force in self-defense is not absolutely absolved from blame. The law takes into account the necessary use of force at the time it is committed.
• B. An individual who uses necessary defense under lethal force is in direct compliance with the law under most circumstances.
• C. Lethal force in self-defense should not be forgiven in all cases for the peace of mind of the primary victim.
• D. The use of lethal force is not evaluated based on the intent of the user, but rather the severity of the primary attack that warranted self-defense.

Correct answer: A

Rationale: The correct answer is A because the author in Passage I discusses the concept of lethal force in self-defense being justified and absolved from blame when used as a last resort to prevent severe harm or death. Choice A undermines this by stating that an instance of lethal force in self-defense is not absolutely absolved from blame and highlights that the law considers the necessary use of force at the time it is committed. This challenges the absolute justification of such actions and would seriously undermine the author's argument. Choice B is incorrect because compliance with the law does not necessarily address the justification and absolution of lethal force. Choice C is incorrect as forgiving lethal force in all cases is not the focus of the author's argument. Choice D is incorrect because the intent of the user is a crucial factor in evaluating the use of lethal force, contrary to what is stated.

5. An object is moving in a circle at constant speed. Is there a net force acting on it?

• A. Yes, always
• B. No, never
• C. Only if its speed is changing
• D. Only if its direction is changing

Correct answer: D

Rationale: When an object is moving in a circle at a constant speed, there is a net force acting on it. This net force is directed towards the center of the circle and is responsible for continuously changing the direction of the object's velocity, even though the speed remains constant. Therefore, the correct answer is D because the net force is required to change the direction of the object's motion in a circular path. Choices A, B, and C are incorrect because the presence of a net force is necessary to continuously change the object's direction as it moves in a circular path, irrespective of changes in speed.

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