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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Count the visible planes group by group (left block, ramp, central wedge, floors, back wall, right steps, front faces) so that none is counted twice.
Updated On: Nov 12, 2026
- 13
- 14
- 15
- 18
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The Correct Option is B
Solution and Explanation
Count the distinct visible planes in the isometric drawing group by group.
Left block: large front face = 1; top face = 1 (2).
Inclined ramp at the upper left = 1 (3).
Central wedge: its sloping top = 1; its triangular side = 1 (5).
Floors: the higher floor behind and the lower floor in front = 2 (7).
Back wall: its top = 1; its inner vertical face = 1 (9).
Front faces of the stepped base: the two narrow risers in the middle = 2 (11); the large right front face = 1 (12).
Right-hand step: riser = 1; tread = 1 (14).
Number of visible surfaces = 14.
Answer: (2) 14
Left block: large front face = 1; top face = 1 (2).
Inclined ramp at the upper left = 1 (3).
Central wedge: its sloping top = 1; its triangular side = 1 (5).
Floors: the higher floor behind and the lower floor in front = 2 (7).
Back wall: its top = 1; its inner vertical face = 1 (9).
Front faces of the stepped base: the two narrow risers in the middle = 2 (11); the large right front face = 1 (12).
Right-hand step: riser = 1; tread = 1 (14).
Number of visible surfaces = 14.
Answer: (2) 14
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