Difficulty: Easy
Correct Answer: Ohm : Resistance
Explanation:
Introduction / Context:
This analogy tests basic knowledge of physical quantities and their units. Seconds is a unit used to measure time. You must select from the options a pair that mirrors this unit to quantity relationship. Recognising correct unit quantity matches is essential both in physics and in reasoning questions that draw on real world knowledge.
Given Data / Assumptions:
Concept / Approach:
The structure of the given pair is Unit : Physical quantity measured by that unit. Seconds is not a type of time but the unit in which time is measured. We must therefore identify an option where the first word names a unit and the second word names the corresponding physical quantity. Among the options, Ohm : Resistance fits this description, since ohm is the SI unit of electrical resistance. Other options either reverse the order or pair unrelated concepts.
Step-by-Step Solution:
Step 1: Clarify the base relationship. Seconds is the unit; time is the quantity that is measured.
Step 2: Examine Angle : Pascal. Angle is a physical quantity, and Pascal is the SI unit of pressure, not of angle. This pair is mismatched in both role and meaning.
Step 3: Examine Length : Metre. Here, length is the physical quantity and metre is its unit. The order is reversed compared to Seconds : Time, which is unit first and quantity second.
Step 4: Examine Area : Volume. Both area and volume are physical quantities, not units, so this pair does not follow the unit quantity pattern at all.
Step 5: Examine Ohm : Resistance. Ohm is the SI unit, and resistance is the physical quantity measured in ohms.
Step 6: Conclude that Ohm : Resistance has the same logical structure as Seconds : Time, namely Unit : Quantity.
Verification / Alternative check:
Write the relationships in parallel phrases. Time is measured in seconds, and resistance is measured in ohms. These statements mirror each other and are correct in physics. In contrast, there is no standard relation such as time is measured in angle or area is measured in volume. The pair Length : Metre has the correct objects but in the opposite order. Therefore, only Ohm : Resistance correctly parallels the original pair in both meaning and ordering.
Why Other Options Are Wrong:
Angle : Pascal confuses two unrelated concepts: angle is a measure of rotation, and Pascal is a unit of pressure. Length : Metre reverses the order by placing the quantity first and the unit second, which does not match Seconds : Time. Area : Volume contains two different quantities and no units at all. As a result, these pairs fail to capture the unit to quantity relationship that the question clearly demands.
Common Pitfalls:
A frequent mistake is to ignore the order of words and choose Length : Metre because they are correctly associated. However, analogy questions are sensitive to direction: Seconds : Time is unit to quantity, not quantity to unit. Another pitfall is to overlook the scientific meaning of terms like Pascal or Ohm and treat them as generic words. Remembering SI units and the quantities they measure helps avoid such errors.
Final Answer:
The only pair that mirrors the Unit : Quantity relation in Seconds : Time is Ohm : Resistance.
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