Understanding the Analogy: Earthquake and Measurement Tools

The question asks us to complete an analogy. An analogy shows the relationship between two things, and we need to find a similar relationship for another pair of things. The first part of the analogy is ‘Fever’ is related to ‘Thermometer’.

Analyzing the First Part of the Analogy: Fever and Thermometer

In the relationship ‘Fever’ and ‘Thermometer’, a fever is a medical condition where the body temperature is elevated. A thermometer is an instrument used to measure body temperature, thereby indicating the presence and severity of a fever.

So, the relationship is: A condition or phenomenon is measured or detected by an instrument or tool.

Applying the Analogy to Earthquake

Now we need to apply this same relationship to ‘Earthquake’. An earthquake is a natural phenomenon involving shaking of the ground caused by seismic waves. We need to find an instrument that measures or detects earthquakes.

Evaluating the Options

Let's look at the given options:

• Voltmeter: A voltmeter is an instrument used to measure the electric potential difference between two points in an electric circuit. This is related to electricity, not earthquakes.
• Barometer: A barometer is an instrument used to measure atmospheric pressure. This is related to weather, not earthquakes.
• Seismograph: A seismograph is an instrument used to detect and record ground motion during an earthquake. It measures the intensity, duration, and other characteristics of seismic waves. This directly relates to earthquakes.
• Ammeter: An ammeter is an instrument used to measure the electric current in a circuit. This is related to electricity, not earthquakes.

Identifying the Correct Relationship

Based on the analysis of the options, the instrument used to measure or detect an earthquake is a seismograph. Therefore, the relationship between ‘Earthquake’ and ‘Seismograph’ is the same as the relationship between ‘Fever’ and ‘Thermometer’ (Condition/Phenomenon : Measuring Instrument).

The completed analogy is: ‘Fever’ is related to ‘Thermometer’ in the same way as ‘Earthquake’ is related to ‘Seismograph’.

Revision Table: Key Instruments

Additional Information: Understanding Seismographs and Earthquakes

A seismograph is a crucial tool in the study of earthquakes, known as seismology. It consists of a sensor, called a seismometer, which detects the ground motion, and a recording system. Early seismographs used paper and pen, creating a wavy line graph called a seismogram. Modern seismographs are electronic and record data digitally.

Earthquakes release energy in the form of seismic waves. Seismographs are designed to be very sensitive to these waves. By analyzing seismograms from multiple stations, scientists can determine the location (epicenter), depth, and magnitude of an earthquake. The magnitude, often reported on scales like the Richter scale or moment magnitude scale, quantifies the energy released by the earthquake.

Understanding how these instruments work helps us monitor and study natural phenomena like earthquakes, providing valuable data for research, hazard assessment, and early warning systems.