Nursing Elites

1. What happens to the frequency of a wave if its wavelength decreases while the speed remains constant?

• A. Frequency decreases
• B. Frequency increases
• C. Frequency remains constant
• D. Frequency becomes zero

Correct answer: b

Rationale: If the speed of the wave remains constant while the wavelength decreases, the frequency of the wave increases.

2. During a healthy heartbeat, the P wave on an ECG represents

• A. The repolarization of the ventricles.
• B. The electrical conduction through the AV node.
• C. The contraction phase of the ventricles (systole)
• D. The depolarization of the atria.

Correct answer: D

Rationale: The correct answer is D: The P wave on an ECG represents the depolarization of the atria. During a healthy heartbeat, the P wave is the first positive deflection seen on the ECG and reflects the initiation of the electrical impulse in the atria, leading to atrial contraction. It is followed by the QRS complex, which represents the depolarization of the ventricles. Options A, B, and C are incorrect because the P wave specifically corresponds to atrial depolarization, not repolarization of the ventricles, electrical conduction through the AV node, or ventricular contraction. Understanding the sequence of electrical events in the heart as represented on an ECG is crucial for interpreting cardiac function and identifying potential abnormalities.

3. What is the unit of measurement for momentum?

• A. Newton-second (N·s)
• B. Kilogram-meter (kg·m)
• C. Joule (J)
• D. Meter per second (m/s)

Correct answer: A

Rationale: Momentum is defined as the product of an object's mass and its velocity. The unit of mass is kilograms (kg) and the unit of velocity is meters per second (m/s). Therefore, the unit of momentum is kilogram-meter per second (kg·m/s). By Newton's second law of motion (F = ma), force is measured in Newtons (N), which is equivalent to kg·m/s². Therefore, multiplying the unit of force (N) by the unit of time (s) gives the unit of momentum as Newton-second (N·s).

4. A closed system in ecology is one that:

• A. Exchanges energy but not matter
• B. Exchanges both energy and matter
• C. Exchanges neither energy nor matter
• D. Recycles nutrients efficiently

Correct answer: A

Rationale: Rationale: In ecology, a closed system is one that does not exchange matter with its surroundings but can exchange energy. This means that while energy can enter or leave the system, the amount of matter within the system remains constant. This definition aligns with option A, making it the correct answer. Options B and C are incorrect because a closed system does not exchange matter, and option D is not directly related to the definition of a closed system in ecology.

5. During photosynthesis, plants capture sunlight and convert water and carbon dioxide into glucose and oxygen. This is an example of a:

• A. Decomposition reaction
• B. Combustion reaction
• C. Synthesis reaction
• D. Double displacement reaction

Correct answer: C

Rationale: The correct answer is C: Synthesis reaction. During photosynthesis, plants combine water and carbon dioxide using sunlight to produce glucose and oxygen. In a synthesis reaction, two or more substances combine to form a more complex product. In this case, glucose and oxygen are synthesized from simpler molecules. A decomposition reaction involves breaking down a compound into simpler substances, which is not the case in photosynthesis. Combustion reactions involve the rapid reaction of a fuel with oxygen to produce heat and light, which is also not the process occurring in photosynthesis. Double displacement reactions involve the exchange of ions between two compounds to form new compounds, which is not the mechanism of photosynthesis. Therefore, the process described in the question aligns with a synthesis reaction.

6. The artist paints breathtaking landscapes. What is the third-person singular, present tense form of the verb "paint"?

• A. painted
• B. paints
• C. painting
• D. painter

Correct answer: B

Rationale: Verbs change depending on the subject (person) and time (tense).

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