Nursing Elites

1. Which of the following is an example of a decomposition reaction?

• A. 2H2 + O2 → 2H2O
• B. CaCO3 → CaO + CO2
• C. 2Na + Cl2 → 2NaCl
• D. N2 + 3H2 → 2NH3

Correct answer: b

Rationale: Decomposition reactions involve the breakdown of a compound into simpler substances.

2. Which word in the sentence "The quick brown fox jumps over the lazy dog" demonstrates alliteration?

• A. quick
• B. brown
• C. fox
• D. jumps

Correct answer: A

Rationale: Alliteration is the repetition of the first consonant sound of words close together. In this case, "quick" and "brown" both start with the "k" sound.

3. The ability of optical fibers to transmit light signals around bends is primarily due to:

• A. Reflection
• B. Refraction
• C. Diffraction
• D. Polarization

Correct answer: B

Rationale: The correct answer is B: Refraction. Optical fibers transmit light signals around bends primarily through the process of refraction. Refraction occurs when light passes from one medium to another, causing it to change direction. In optical fibers, the core material has a higher refractive index than the cladding, which causes light to be reflected internally along the fiber. This phenomenon allows light signals to travel through the fiber even around bends without significant loss. Reflection (Option A) involves light bouncing off a surface, which is not the main mechanism in optical fibers. Diffraction (Option C) refers to the bending of light waves around obstacles and is not the main reason for light transmission in optical fibers. Polarization (Option D) relates to the orientation of light waves, which is not the primary factor enabling light transmission around bends in optical fibers.

4. In meiosis, how many divisions occur, and how many daughter cells are produced?

• A. One division, two daughter cells
• B. Two divisions, four daughter cells
• C. Four divisions, eight daughter cells
• D. Eight divisions, sixteen daughter cells

Correct answer: B

Rationale: Rationale: In meiosis, there are two divisions: meiosis I and meiosis II. During meiosis I, homologous chromosomes separate, resulting in two daughter cells with half the number of chromosomes as the parent cell. In meiosis II, sister chromatids separate, resulting in a total of four daughter cells, each with a haploid set of chromosomes. Therefore, meiosis involves two divisions and produces four daughter cells.

5. The term "barn" is a unit commonly used in nuclear physics to quantify:

• A. Energy (Electron volts are the standard unit for energy in nuclear physics)
• B. Radioactivity
• C. Nuclear cross-section
• D. Half-life

Correct answer: C

Rationale: The term 'barn' is a unit of measurement used in nuclear physics to quantify nuclear cross-section. Nuclear cross-section refers to the measure of the probability of a specific interaction occurring between particles during a nuclear reaction. The term 'barn' was coined based on its relation to the physical size of a nucleus, as it is a small unit of area used to describe the likelihood of a particle interacting with a nucleus. It is not used to quantify energy, radioactivity, or half-life, making options A, B, and D incorrect in this context.

6. Which skin condition is characterized by patches of inflamed, reddened skin and is often triggered by allergens or stress?

• A. Eczema
• B. Psoriasis
• C. Acne
• D. Vitiligo

Correct answer: A

Rationale: The correct answer is A: Eczema. Eczema is a skin condition characterized by patches of inflamed, reddened skin that can be triggered by allergens or stress. It is a chronic condition that can cause itching and discomfort. Psoriasis (option B) is a different skin condition characterized by red, scaly patches on the skin. Acne (option C) is a common skin condition characterized by pimples and clogged pores. Vitiligo (option D) is a condition where the skin loses its pigment, resulting in white patches. Therefore, eczema best fits the description provided in the question.

Similar Questions