Select the option that is related to the third word in the same way as the second word is related to the first word. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.) Time ∶ Second ∶∶ Electric Current ∶ ?
Understanding Analogies and SI Units
The question presents an analogy: Time is to Second as Electric Current is to a missing word. Analogies require us to find the relationship between the first pair of words and apply the same relationship to the third word to find the fourth word.
Let's examine the first pair:
- Time: This is a fundamental physical quantity.
- Second: This is the standard international (SI) unit for measuring Time.
So, the relationship between the first pair (Time : Second) is that the second word is the SI unit of the physical quantity represented by the first word.
Applying the Analogy to Electric Current
Now, we need to apply this same relationship to the third word, which is Electric Current.
- Electric Current: This is another fundamental physical quantity.
- The missing word should be the SI unit for Electric Current.
Identifying the SI Unit for Electric Current
Let's look at the given options and identify which one represents the SI unit for Electric Current.
| Option | Unit | Physical Quantity |
|---|---|---|
| 1 | Ampere | Electric Current |
| 2 | Kelvin | Thermodynamic Temperature |
| 3 | Candela | Luminous Intensity |
| 4 | Mole | Amount of Substance |
From the table, we can see that Ampere is the SI unit for Electric Current.
Conclusion
Following the analogy, since Second is the SI unit of Time, the SI unit of Electric Current is Ampere. Therefore, the missing word that completes the analogy Time : Second :: Electric Current : ? is Ampere.
The completed analogy is: Time : Second :: Electric Current : Ampere.
Revision Table: Fundamental SI Units
| Physical Quantity | SI Unit | Symbol |
|---|---|---|
| Length | metre | m |
| Mass | kilogram | kg |
| Time | second | s |
| Electric Current | ampere | A |
| Thermodynamic Temperature | kelvin | K |
| Amount of substance | mole | mol |
| Luminous intensity | candela | cd |
Additional Information on Analogical Reasoning and Units
Analogical reasoning is a cognitive process that involves transferring information or meaning from a particular subject (the source) to another particular subject (the target), or a general understanding from a particular instance to another particular instance. In verbal analogies like this one, the goal is to identify the relationship between the first pair of words and find a word that has the same relationship with the third word.
Understanding SI units is crucial in physics and other sciences. The International System of Units (SI) defines seven base units, which are considered the foundation of all measurement. These units provide a standardized way to measure fundamental physical quantities globally. The question tests knowledge of these fundamental units and their corresponding quantities.
The relationship in the analogy Time : Second is specifically about the standard unit of measurement. Recognizing this relationship is key to solving the problem correctly by finding the corresponding standard unit for Electric Current.
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