Match the following materials with their corresponding resistivity values.

RRB Nsg. Superintendent - 29 April 2025 (Shift-3rd)

General Knowledge

Easy

Appeared in: RRB Nsg. Superintendent - 29 April 2025 (Shift-3rd)

Explanation

Conductors, like copper and aluminum, have very low resistivity, allowing electric current to flow easily. Their resistivity is typically in the range of 10⁻⁸ to 10⁻⁶ Ω-m, which matches (iii).
Insulators, such as rubber and glass, have extremely high resistivity, which prevents the flow of current. Their resistivity range is 10¹¹ to 10¹⁹ Ω-m, corresponding to (i).
Semiconductors, like silicon and germanium, have resistivity values that fall between those of conductors and insulators. The range 10⁻⁵ to 10⁶ Ω-m is characteristic of semiconductors, matching (ii).
The correct option combines these three matches: (a)-(iii), (b)-(ii), and (c)-(i).

Option A: This option incorrectly matches conductors (a) with the resistivity of semiconductors (ii) and semiconductors (b) with the resistivity of insulators (i).
Option C: This option incorrectly matches conductors (a) with the resistivity of insulators (i) and insulators (c) with the resistivity of conductors (iii). This is the complete opposite of the correct relationship.
Option D: This option incorrectly matches conductors (a) with the resistivity of semiconductors (ii) and semiconductors (b) with the resistivity of conductors (iii).

Visual 1: Energy Band Diagram. A diagram showing the valence band, conduction band, and energy gap for conductors, insulators, and semiconductors. This visually explains why their resistivities differ: conductors have overlapping bands (no gap), insulators have a large gap, and semiconductors have a small gap.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of materials based on electrical resistivity as background academic context rather than a clinical decision trigger.
Understanding the electrical properties of materials is fundamental in a medical context. Conductive materials (e.g., copper wires) are essential for medical devices like ECG machines, pacemakers, and defibrillators to transmit electrical signals.
Insulating materials (e.g., plastic or rubber coatings on wires and equipment) are critical for patient and operator safety, preventing electric shocks and short circuits.
Semiconductors are the basis of all modern electronics, including the complex computer systems found in advanced medical imaging (MRI, CT scanners) and monitoring equipment.

How to Approach the Question

First, understand the question asks to match material types with their electrical resistivity values.
Recall the basic definitions: Conductors allow current to flow easily (low resistivity), Insulators block current flow (high resistivity), and Semiconductors are in between.
Examine the resistivity values provided in Column 2. Identify the lowest range (10⁻⁶ - 10⁻⁸), the highest range (10¹¹ - 10¹⁹), and the intermediate range (10⁻⁵ - 10⁶).
Match 'Conductors' with the lowest resistivity range.
Match 'Insulators' with the highest resistivity range.
Match 'Semiconductors' with the intermediate range.

Concept Tested & Keywords

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