Nursing Elites

1. When light travels from air into a denser medium like glass, its speed:

• A. Increases
• B. Decreases
• C. Remains constant
• D. Becomes unpredictable

Correct answer: B

Rationale: When light travels from air into a denser medium like glass, its speed decreases. This is because the higher refractive index of the denser medium causes light to slow down as it propagates through the medium. Choice A is incorrect because the speed of light decreases in a denser medium. Choice C is incorrect because the speed of light changes when it enters a denser medium. Choice D is incorrect because the change in speed is predictable based on the refractive index of the medium.

2. Change the following percentage to a decimal: 0.03%

• A. 0.03
• B. 0.0003
• C. 0.3
• D. 0.003

Correct answer: B

Rationale: To convert a percentage to a decimal, divide by 100. Therefore, 0.03% ÷ 100 = 0.0003. The correct answer is B. Choice A (0.03) is incorrect because it does not account for the conversion of percentage to decimal. Choice C (0.3) is incorrect as it represents 0.03 as 30% rather than 0.03%. Choice D (0.003) is also incorrect as it does not accurately convert 0.03% to a decimal.

3. What process do cells in the tip of a plant’s root undergo to increase in number?

• A. Meiosis
• B. Cytokinesis
• C. Fractioning
• D. Mitosis

Correct answer: D

Rationale: Cells in the tip of a plant's root undergo the process of mitosis to increase in number. Mitosis is a type of cell division that results in two daughter cells with the same number of chromosomes as the parent cell. This process allows for growth and maintenance of tissues in plants by producing new cells through division. Choice A, Meiosis, is incorrect as meiosis is a type of cell division that reduces the number of chromosomes in cells to produce gametes. Choice B, Cytokinesis, is incorrect as it is the division of the cytoplasm following cell division. Choice C, Fractioning, is not a biological process related to cell division.

4. Which nutrients are important for bone health?

• A. Vitamin D
• B. Calcium and phosphorus
• C. Iron and zinc
• D. Magnesium and sodium

Correct answer: B

Rationale: Calcium and phosphorus are crucial nutrients for bone health as they are essential minerals required for bone strength, density, and various body functions. Adequate intake of calcium and phosphorus through the diet is important for maintaining healthy bones and preventing conditions like osteoporosis. Vitamin D helps with calcium absorption, but it is not the main nutrient responsible for bone health. Iron and zinc are important for other bodily functions, not specifically bone health. Magnesium and sodium, while important for overall health, are not as directly linked to bone health as calcium and phosphorus.

5. What is the electric field inside a hollow conductor with a net charge?

• A. Remains constant
• B. Decreases
• C. Zero
• D. Becomes unpredictable

Correct answer: C

Rationale: The correct answer is C: Zero. According to Gauss’s Law, the electric field inside a hollow conductor (a conductor with no charge inside but a net charge on its surface) is zero. The charges reside on the outer surface of the conductor, causing the electric field inside to cancel out. Choices A, B, and D are incorrect because the electric field inside a hollow conductor with a net charge is not constant, does not decrease, and does not become unpredictable; it is zero due to the distribution of charges on its surface.

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