Question:
The question figure shows the 3D view of an object. Identify the correct number of visible surfaces.
The question figure shows the 3D view of an object. Identify the correct number of visible surfaces.
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Go through the object part by part and count every separate plane that can be seen in the isometric view.
Updated On: Nov 12, 2026
- 9
- 10
- 11
- 12
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The Correct Option is B
Solution and Explanation
Count each distinct visible plane of the object in the isometric drawing.
Main tall block: top face (with the slot opening) = 1; the large left-front face = 1; the large right face = 1. Total so far 3.
Slot cut in the top of the block: the long inner wall = 1; the small end wall = 1; the small floor of the slot = 1. Total 6.
Left ledge (low projection on the left): its top = 1; its front face = 1. Total 8.
Right base flange (low projection on the right): its top = 1; its front face = 1. Total 10.
The small notch in the front edge of the left ledge lies in planes already counted.
Number of visible surfaces = 10.
Answer: (2) 10
Main tall block: top face (with the slot opening) = 1; the large left-front face = 1; the large right face = 1. Total so far 3.
Slot cut in the top of the block: the long inner wall = 1; the small end wall = 1; the small floor of the slot = 1. Total 6.
Left ledge (low projection on the left): its top = 1; its front face = 1. Total 8.
Right base flange (low projection on the right): its top = 1; its front face = 1. Total 10.
The small notch in the front edge of the left ledge lies in planes already counted.
Number of visible surfaces = 10.
Answer: (2) 10
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