Six faces of a cube are numbered from 1 to 6, each face carrying one different number. Further, 1. The face 2 is opposite to the face 6. 2. The face 1 is opposite to the face 5. 3. The face 3 is between the face 1 and the face 5. 4. The face 4 is adjacent to the face 2. Which one of the following is correct?
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UPSC Civil Services preparation
- AThe face 2 is adjacent to the face 3Correct
- BThe face 6 is between the face 2 and the face 4
- CThe face 1 is between the face 5 and the face 6
- DNone of the above
Explanation
Here's a step-by-step analysis:
1. Identify the pairs of opposite faces:
* From statement 1: Face 2 is opposite to face 6. (Pair: 2-6)
* From statement 2: Face 1 is opposite to face 5. (Pair: 1-5)
* Since there are 6 faces, the remaining two faces must also be opposite: Face 3 is opposite to face 4. (Pair: 3-4)
2. Analyze the given positional statements:
* Statement 3: "The face 3 is between the face 1 and the face 5." On a cube, if two faces (1 and 5) are opposite, any other face (like 3) that is not opposite to either of them will be adjacent to both. So, this means face 3 is adjacent to face 1 and face 3 is adjacent to face 5. This is consistent with our opposite pairs (3 is not opposite 1 or 5).
* Statement 4: "The face 4 is adjacent to the face 2." This is a crucial piece of information.
3. Evaluate Option A: "The face 2 is adjacent to the face 3."
* From statement 4, we know that 4 is adjacent to 2.
* We know that 3 is opposite to 4 (from step 1).
* We know that 6 is opposite to 2 (from step 1).
* On a cube, if two faces are adjacent (e.g., 4 and 2), then their opposite faces must also be adjacent. So, if 4 is adjacent to 2, then 3 (opposite 4) must be adjacent to 6 (opposite 2).
* Now we have: 3 is adjacent to 6.
* We also know that 2 is opposite to 6.
* If face A (3) is adjacent to face B (6), and face C (2) is opposite to face B (6), then face A (3) must be adjacent to face C (2). (Imagine 6 is the front face, 2 is the back. If 3 is adjacent to 6, 3 could be top, bottom, left, or right. Any of these positions is also adjacent to the back face 2).
* Therefore, face 2 is adjacent to face 3. This makes option A correct.
4. Evaluate other options to confirm:
* Option B: "The face 6 is between the face 2 and the face 4." This implies face 6 is adjacent to face 2. However, we know from statement 1 that face 6 is opposite to face 2. Opposite faces cannot be adjacent. So, B is incorrect.
* Option C: "The face 1 is between the face 5 and the face 6." This implies face 1 is adjacent to face 5. However, we know from statement 2 that face 1 is opposite to face 5. Opposite faces cannot be adjacent. So, C is incorrect.
Since options B and C are definitively incorrect, and our deduction confirms A, option A is the correct answer.
The final answer is A.

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