Understanding Analogies: Electricity and Atmospheric Pressure

The question asks us to find the term that completes the analogy: Electricity : Galvanometer :: Atmospheric Pressure : ______.

An analogy works by establishing a relationship between the first pair of terms and then applying the same relationship to the second pair. We need to figure out how 'Electricity' and 'Galvanometer' are related.

A Galvanometer is an instrument used to detect and measure small amounts of electric current (Electricity).

So, the relationship is: Instrument used to measure/detect the first term.

Now, we apply this same relationship to the second pair. We have 'Atmospheric Pressure' as the third term, and we need an instrument that measures or detects Atmospheric Pressure as the fourth term. Let's look at the options provided:

• Barometer: An instrument used to measure atmospheric pressure.
• Osmometer: An instrument used to measure osmotic pressure, which is related to the concentration of a solution.
• Sphygmomanometer: An instrument used to measure blood pressure.
• Hydrometer: An instrument used to measure the specific gravity (or relative density) of liquids.

Comparing the functions of these instruments with the required relationship, we see that the Barometer is the instrument specifically designed to measure Atmospheric Pressure.

Therefore, the complete analogy is: Electricity : Galvanometer :: Atmospheric Pressure : Barometer.

Instruments for Measurement

Understanding different measuring instruments is crucial for solving such analogies. Here's a brief summary of the instruments mentioned:

Based on this analysis, the instrument related to Atmospheric Pressure in the same way a Galvanometer is related to Electricity is the Barometer.

Revision Table: Key Instruments and Measurements

Additional Information: Types of Instruments

Instruments are tools designed to measure physical quantities. They are essential in science, engineering, and everyday life. Understanding the specific function of different instruments helps in solving analogy-based questions and understanding scientific concepts.

• Instruments can be mechanical, electrical, or digital.
• Some instruments provide a direct reading, while others require calculation.
• Accuracy and precision are important characteristics of measuring instruments.
• Calibration is necessary to ensure instruments provide correct measurements.

For example, a simple mercury barometer measures atmospheric pressure based on the height of a mercury column that the atmospheric pressure can support against a vacuum. An aneroid barometer uses a sealed metal chamber that expands or contracts with changes in pressure.

Similarly, a galvanometer works by detecting the magnetic field produced by an electric current passing through a coil. This field interacts with a permanent magnet, causing a needle to deflect, indicating the presence and magnitude of the current.