Nursing Elites

1. What property of a wave determines the loudness of sound when heard by the human ear?

• A. Frequency
• B. Amplitude
• C. Wavelength
• D. Velocity

Correct answer: b

Rationale: The amplitude of a sound wave correlates with its perceived loudness by the human ear.

2. Which structure in the respiratory system is responsible for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream?

• A. Trachea
• B. Bronchi
• C. Alveoli
• D. Bronchioles

Correct answer: C

Rationale: The correct answer is C, Alveoli. Alveoli are tiny air sacs located at the end of the bronchioles in the lungs where the exchange of oxygen and carbon dioxide takes place. Oxygen from the air we breathe diffuses into the bloodstream through the alveoli walls, while carbon dioxide from the bloodstream diffuses into the alveoli to be exhaled. The trachea and bronchi are responsible for carrying air to and from the lungs, while bronchioles are small air passages within the lungs that branch off from the bronchi. However, the actual gas exchange occurs in the alveoli, making them crucial for the respiratory system's function.

3. The part of the brain responsible for balance and coordination is the:

• A. Cerebellum
• B. Cerebrum
• C. Hypothalamus
• D. Thalamus

Correct answer: A

Rationale: The correct answer is A: Cerebellum. The cerebellum is the part of the brain responsible for balance and coordination. It receives information from the sensory systems, spinal cord, and other parts of the brain to coordinate voluntary movements such as posture, balance, and speech. The cerebrum (option B) is responsible for higher brain functions such as thinking and decision-making. The hypothalamus (option C) is involved in regulating basic biological needs such as hunger and thirst. The thalamus (option D) acts as a relay station for sensory information. Therefore, the cerebellum is the specific part of the brain that plays a crucial role in maintaining balance and coordination.

4. Which property of a wave determines its pitch in sound waves?

• A. Amplitude
• B. Frequency
• C. Wavelength
• D. Speed

Correct answer: B

Rationale: The pitch of a sound wave is determined by its frequency. Frequency refers to the number of cycles of a wave that occur in a unit of time, usually measured in hertz (Hz). Higher frequencies correspond to higher pitches, while lower frequencies correspond to lower pitches. Amplitude refers to the height of a wave and is related to the loudness of the sound. Wavelength is the distance between two consecutive points in a wave that are in phase, and speed is the rate at which a wave travels through a medium.

5. Which of the following units is equivalent to a joule?

• A. Newton-meter (N·m)
• B. Watt (W)
• C. Kilogram (kg)
• D. Ampere (A)

Correct answer: a

Rationale: A joule, as a unit of energy, is equivalent to a newton-meter in terms of work or energy.

6. The critical angle is defined as the minimum angle of incidence in a denser medium for which light undergoes:

• A. Total internal reflection
• B. Continued refraction
• C. Specular reflection
• D. Increased dispersion

Correct answer: A

Rationale: The critical angle is the minimum angle of incidence at which light is totally internally reflected rather than refracted. When light travels from a denser medium to a rarer medium at an angle greater than the critical angle, it undergoes total internal reflection. This phenomenon is crucial in applications like fiber optics and mirages. Continued refraction (option B) occurs when light enters a medium at an angle less than the critical angle. Specular reflection (option C) refers to the reflection of light at a smooth surface. Increased dispersion (option D) involves the separation of light into its constituent colors due to varying refractive indices, which is not directly related to the critical angle. Therefore, the correct answer is A - total internal reflection.

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