Difficulty: Easy
Correct Answer: Water : Tap
Explanation:
Introduction / Context:
This question checks your understanding of functional relationships between objects and the things they depend on. You are to pick the pair whose relationship is of a different type from the others. The words relate to ideas like fuel, energy and essential requirements.
Given Data / Assumptions:
Concept / Approach:
Look for a common pattern among most pairs. In four of the pairs, the first word is something that is required for the proper functioning or existence of the second. In other words, the first word can be thought of as a \"fuel\", \"energy source\" or \"vital requirement\" for the second. The odd pair will be the one where this simple requirement relationship does not hold in the same way.
Step-by-Step Solution:
Step 1: Consider \"Oil : Lamp\". A traditional oil lamp needs oil as a fuel to burn and produce light. Without oil, the lamp cannot function as a lamp.Step 2: Look at \"Oxygen : Life\". Most forms of life, especially human life, require oxygen for breathing and cellular processes. Oxygen is essential for life to exist and continue.Step 3: Examine \"Power : Machine\". Machines generally require electrical power, mechanical power or some form of energy to run. Without power, the machine will not operate. So power is the essential energy source for the machine.Step 4: Check \"Fuel : Engine\". An engine needs fuel such as petrol or diesel to operate. Without fuel, the engine cannot run. This is clearly another requirement relationship.Step 5: Now turn to \"Water : Tap\". A tap is a device or fitting used to control the flow of water. It supplies water rather than requiring water to exist as an object. The tap is the mechanism, and water is the fluid that passes through it.Step 6: In this case, it is more natural to say that the tap provides water or controls water, rather than saying that water is an essential requirement for a tap to exist. The relationship direction is reversed compared to the other pairs.Step 7: Oil, oxygen, power and fuel are all needed by the second item (lamp, life, machine, engine) to function, but water is the product that a tap gives, not a required input in the same conceptual sense.Step 8: Therefore, Water : Tap is the pair that is differently related.
Verification / Alternative check:
Rephrase each pair as a sentence: \"A lamp needs oil\", \"Life needs oxygen\", \"A machine needs power\", \"An engine needs fuel\". All of these sentences sound natural and correct. Now try \"A tap needs water\". While a tap is used to supply water, the statement does not feel like the same kind of requirement relationship as the others. Instead, you would normally say \"A tap supplies water\". This confirms that the direction of dependence is different.
Why Other Options Are Wrong:
Oil : Lamp, Oxygen : Life, Power : Machine and Fuel : Engine all show the same basic pattern: the first item is a vital fuel, resource or energy source that the second item requires to perform its function. Because they share this pattern, none of them can be considered differently related. Water : Tap is the only pair where the first item is more clearly an output or content controlled by the second.
Common Pitfalls:
Candidates sometimes focus on whether the second item is living or non living, which is not relevant here. Others try to see whether the first item is liquid or gas, again not the key. The correct approach is to look at the direction of necessity: who needs what to function? Once you do that, the odd one out becomes clear.
Final Answer:
The pair which is differently related from the others is Water : Tap.
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