A dice has its faces marked by letters U, V, W, X, Y and Z. Two different positions of the same dice are given below. Select the letter that will be on the face opposite to the one having Y?

​

Logic:  As Z is the common face on both the dice, keeping it constant and then rotating in clockwise/anti clockwise direction, we get the faces opposite to each other:
Common face is opposite to hidden face.
Z---X---W
Z---V---U
Here,
Z ⟷ Y (Hidden Face) → From Options
X ⟷ V
W ⟷ U
Therefore, Z on the face opposite to Y.
Thus, the correct option is (a) Z.​​