Match common biomedical instruments to what they primarily measure or help diagnose. List I (Instrument) List II (Use) A. Electro-encephalograph 1. Diagnostic tool for heart ailments B. Electro-cardiograph 2. Diagnostic tool for brain ailments C. Sphygmomanometer 3. Used for measuring blood pressure (BP) D. Stethoscope 4. Used to hear pulse/heartbeat sounds

Introduction / Context:
Biomedical instruments are foundational to clinical diagnostics. Correctly associating devices with their clinical roles is important for students in biomedical, electronics, and instrumentation engineering.

Given Data / Assumptions:

• Electro-encephalograph (EEG) measures brain electrical activity.
• Electro-cardiograph (ECG) records heart electrical activity.
• Sphygmomanometer measures arterial blood pressure.
• Stethoscope is an acoustic tool to auscultate heart and lung sounds.

Concept / Approach:

Match each instrument to its principal clinical function: EEG→brain, ECG→heart, sphygmomanometer→BP, stethoscope→listening to beats/sounds. This is a direct knowledge recall with no calculations.

Step-by-Step Solution:

Verification / Alternative check:

Hospital workflows: neurologists rely on EEG; cardiologists on ECG; nurses use sphygmomanometers for vitals; stethoscopes are ubiquitous for auscultation. These confirm the mapping.

Why Other Options Are Wrong:

• Swapping EEG with ECG misassigns organ systems.
• Attributing BP measurement to a stethoscope confuses accessory use (Korotkoff sounds) with the measuring device.

Common Pitfalls:

Confusing the role of the stethoscope during manual BP measurement: it detects sounds, but pressure is measured by the cuff/gauge (sphygmomanometer).

Final Answer:

A-2, B-1, C-3, D-4