Which of the following Venn diagrams best represents the relationship between stars, planets and moons?

DSSSB - 29 August 2019 (Shift-1)

Reasoning

Medium

Appeared in: DSSSB - 29 August 2019 (Shift-1)

Explanation

The question requires identifying the correct set relationship between Stars, Planets, and Moons.
Stars, Planets, and Moons are three distinct categories of celestial objects with no overlap.
A star generates its own light (e.g., the Sun).
A planet orbits a star (e.g., Earth).
A moon orbits a planet (e.g., Earth's Moon).
Because these three sets are mutually exclusive (disjoint), they must be represented by three separate, non-overlapping circles.

Option B: This diagram shows two concentric circles, which represents a subset relationship between two sets. It is incorrect because there are three categories (stars, planets, moons), not two, and none is a subset of another.
Option C: This diagram shows three concentric circles, representing a nested subset relationship (A is a subset of B, and B is a subset of C). This is incorrect because moons are not a type of planet, and planets are not a type of star.
Option D: This diagram shows three intersecting circles, which implies that there are elements common to the sets. This is incorrect because an object cannot be a star and a planet at the same time, or any other combination.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Logical reasoning using Venn diagrams to represent set relationships as background academic context rather than a clinical decision trigger.
This question assesses logical and analytical reasoning, a critical skill for nurses.
Nurses use logical reasoning daily to interpret patient data, understand cause-and-effect relationships between symptoms and conditions, and make sound clinical judgments.
Strong reasoning skills help in prioritizing care, troubleshooting equipment, and applying nursing protocols correctly.

How to Approach the Question

Step 1: Identify the distinct groups or sets mentioned in the question. Here, the sets are 'Stars', 'Planets', and 'Moons'.
Step 2: Define each set and determine the relationship between them. Ask if one set can be part of another (subset), if they can have common members (intersection), or if they are completely separate (disjoint).
Step 3: Analyze the definitions. A star creates light. A planet orbits a star. A moon orbits a planet. These are three mutually exclusive definitions.
Step 4: Conclude that the sets are disjoint, meaning they have no members in common.
Step 5: Match this relationship to the provided Venn diagrams. A diagram with three separate, non-overlapping circles is the correct representation for disjoint sets.
Step 6: Eliminate the other options. Concentric circles represent subsets, and intersecting circles represent overlapping sets, neither of which applies here.

Concept Tested & Keywords

Concept Tested: Logical reasoning using Venn diagrams to represent set relationships.
Stem keywords: Venn diagram, relationship, stars, planets, moons
Lead-in keywords: best represents

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