Light is to blind as which of the following pairs best completes a similar relationship about loss of ability.

Introduction / Context:
This analogy question plays on the relationship between a stimulus and a person who lacks the ability connected with that stimulus. Light is something that normal eyes can perceive, but a blind person cannot see light. We are asked to pick a pair that mirrors this type of relationship with another sense or ability. The options mix body parts, physical phenomena and conditions, so careful reasoning is important.

Given Data / Assumptions:

• First pair: Light : blind.
• Blind describes a person who cannot see light or has lost the power of sight.
• Options: Tongue : Sound, Voice : Vibration, Language : Deaf, Speech : Dumb.
• We assume normal meanings of blind, deaf and dumb as used in traditional exam questions.

Concept / Approach:
The pattern can be stated as “thing that normally interacts with a human sense” and “condition in which that sense or related ability is absent.” Light is what a person sees; a blind person lacks the ability to see. To mirror that idea, we must think of another activity related to a sense and a condition where that activity is absent. Dumb traditionally means unable to speak, while speech is the activity that such a person cannot perform. Therefore, Speech : dumb mirrors Light : blind, because both express a normal phenomenon and a person who lacks the related ability.

Step-by-Step Solution:
Step 1: Rewrite the first pair in words: Light is something a blind person cannot see. Step 2: Look for a pair where the first word is an activity or phenomenon and the second word is a condition of being unable to perform or interact with it. Step 3: Consider Speech : dumb. A dumb person is one who cannot speak, so this pair fits the structure. Step 4: Verify that none of the other options give such a neat and standard relationship.

Verification / Alternative check:
Check each incorrect option. Tongue : sound is about an organ and a phenomenon, but a person with no tongue can still hear sound, so there is no loss of the same sense. Voice : vibration is not about inability at all. Language : deaf is also mismatched, because deafness is about hearing, and language is a system of communication, not directly the stimulus that deaf people cannot perceive. Only Speech : dumb describes an action and a condition of inability to perform that action, exactly like Light : blind describes a stimulus and a condition of inability to sense it.

Why Other Options Are Wrong:

• Tongue : sound: The tongue helps produce speech, but sound is heard by ears; the sense and disability do not directly match.
• Voice : vibration: Here both words are physical phenomena; there is no human condition of inability involved.
• Language : deaf: Deaf people cannot hear sounds, but they can use sign language; the relationship is not parallel to light and blindness.

Common Pitfalls:
A common mistake is to focus on surface connections like tongue with sound or language with deaf because they seem related to hearing and speaking. However, analogy questions demand the same type of logical relationship, not just a vague connection. Always restate the first pair in a clear sentence, then try to fit each option into a similar sentence and see which one truly matches the pattern.

Final Answer:
The correct analogous pair is Speech : dumb, because a dumb person cannot speak just as a blind person cannot see light.