Which one is different?

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

The question requires identifying the option that belongs to a different category from the others.
Pluto is classified as a dwarf planet by the International Astronomical Union (IAU).
Mars, Earth, and Mercury are all classified as major planets.
The fundamental difference is the official astronomical classification, making Pluto the unique item in the list.

Option B: Mars is incorrect because it shares the characteristic of being a major, terrestrial (rocky) planet with Earth and Mercury.
Option C: Earth is incorrect because it is a major planet, similar to Mars and Mercury in this classification context.
Option D: Mercury is incorrect as it is also a major, terrestrial planet, fitting in the same category as Mars and Earth.

Visual 1: Infographic - A diagram showing the eight major planets and the dwarf planets (including Pluto) in our solar system to visually represent their different classifications and orbits.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of celestial bodies and logical reasoning as background academic context rather than a clinical decision trigger.
This type of 'odd one out' question, while not clinical, tests analytical and logical reasoning skills.
These cognitive skills are crucial for nurses in clinical practice for tasks like differential diagnosis, prioritizing care, and identifying subtle changes in a patient's condition that deviate from the expected pattern.
What if? If the options were Jupiter, Saturn, Uranus, and Earth, the answer would be Earth. The first three are Gas Giants, while Earth is a Terrestrial planet. This highlights the importance of identifying the specific shared category to find the outlier.

How to Approach the Question

First, identify the question type. This is an 'odd one out' or 'classification' question that requires finding the item that doesn't fit with the others.
Analyze the given options: Pluto, Mars, Earth, and Mercury. All are celestial bodies in our solar system.
Look for a common characteristic or category that links three of the four options. Consider properties like size, composition, or official classification.
Recall or deduce that Mars, Earth, and Mercury are all considered 'major planets'. They are also the inner, rocky (terrestrial) planets.
Evaluate the remaining option, Pluto. Recall that Pluto's status was changed; it is now classified as a 'dwarf planet'.
Conclude that since Pluto has a different official classification from the other three, it is the correct answer.

Concept Tested & Keywords

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Practise the full NORCET 2 -2021 (Shift-2)

Attempt every question from this paper in a timed mock, then review the full solution for each one.