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Nursing Elites

ATI TEAS 7

Physics

1. A spring is stretched and released, causing an object attached to it to oscillate. What determines the frequency of the oscillations?

Correct answer: B

Rationale: The stiffness of the spring. Frequency depends on the spring constant and the mass, but the mass term cancels out in the formula for simple harmonic motion, leaving only the spring constant.

2. Which of the following is the main organ responsible for regulating sleep?

Correct answer: B

Rationale: Rationale: The hypothalamus is the main organ responsible for regulating sleep. It plays a crucial role in controlling the body's circadian rhythm, which is the internal clock that regulates the sleep-wake cycle. The hypothalamus receives input from the eyes about light and darkness, which helps in determining when it is time to sleep or wake up. It also regulates the production of melatonin by the pineal gland, which is a hormone that helps control sleep patterns. While the thalamus is involved in relaying sensory information to the brain, the pituitary gland is responsible for producing and releasing hormones, and the pineal gland produces melatonin under the control of the hypothalamus.

3. What is the term for the time it takes for a wave to complete one full cycle?

Correct answer: c

Rationale: The period of a wave is the time taken for one complete oscillation or cycle.

4. A light ray travels from air (refractive index 1.00) into water (refractive index 1.33). What happens to its speed and direction?

Correct answer: A

Rationale: Due to the change in refractive index, the light ray bends towards the normal (water) as it slows down upon entering the denser medium.

5. What is the principle behind the phenomenon of refraction, where waves bend when entering a new medium?

Correct answer: C

Rationale: Refraction occurs because of the change in wave speed as it enters a new medium, causing the wavefront to bend and change direction.

6. Which of the following is the MOST common symptom of angina pectoris, a condition related to insufficient blood flow to the heart?

Correct answer: B

Rationale: The correct answer is B: Chest pain or discomfort. Angina pectoris is characterized by chest pain or discomfort that occurs when the heart muscle does not receive enough oxygen-rich blood. This pain is often described as a squeezing, pressure, heaviness, or tightness in the chest. While other symptoms like fever, chills, shortness of breath, numbness, or tingling in the extremities can occur in various conditions, chest pain is the hallmark symptom of angina pectoris. It is important to recognize this symptom as it may indicate an underlying heart issue and prompt medical attention is crucial.

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