NCIDQ IDPX EXAM | INTERIOR DESIGN PROFESSIONAL EXAM
2026/2027 LATEST UPDATE | QUESTIONS AND VERIFIED ANSWERS
| GRADED A+
In terms of occupant health, which of the following lamp types is BEST used in a bedroom?
(A) LED lamp
(B) Fluorescent lamp
(C) Incandescent lamp
(D) Clear mercury vapor lamp -
CORRECT|ANSWER
(C) Incandescent lamp
A digital signage monitor is going to be installed in an elevator lobby, with the bottom edge at 36"
[914 mm] AFF. What does the designer need to confirm with the signage vendor?
(A) The monitor depth will not project into the corridor
(B) The monitor depth will not project more than 4" [102 mm] into the corridor (C) The monitor
depth will not project more than 7" [178 mm] into the corridor (D) The monitor depth will not
project more than 12" [305 mm] into the corridor -
CORRECT|ANSWER
(B) The monitor depth will not project more than 4" [102 mm] into the corridor
When designing a stair with open risers, what is the maximum opening between treads?
(A) The opening must not allow a 2" [51 mm] sphere to pass through
(B) The opening must not allow a 4" [102 mm] sphere to pass through (C) The opening
must not allow a 7" [178 mm] sphere to pass through
(D) The opening must not allow an 11" [279 mm] sphere to pass through -
CORRECT|ANSWER
(B) The opening must not allow a 4" [102 mm] sphere to pass through
Which wall construction will provide the BEST speech privacy for a conference room?
(A) Full height 1/2" thick frameless glass storefront system with frosted film
(B) Full height 3/4" thick frameless glass storefront system with frosted film
, (C) Full height wood stud with one layer of 5/8" thick gypsum board on each side (D) Full height
metal stud with one layer of 5/8" thick gypsum board on each side -
CORRECT|ANSWER
(D) Full height metal stud with one layer of 5/8" thick gypsum board on each side
What is the typical height of the cut plane, when generating a floor plan?
(A) At the floor line
(B) 4'-0" [1210 mm] above the floor line (C) 6' 0" [1828 mm] above the floor line (D) 8' 0" [2420 mm]
above the floor line -
CORRECT|ANSWER
(B) 4'-0" [1210 mm] above the floor line
An abstract diagram that represent the program's spaces, activities, and circulation patterns is called
a:
(A) bubble diagram
(B) adjacency matrix
(C) blocking diagram
(D) preliminary space plan -
CORRECT|ANSWER
(A) bubble diagram
For a kitchen remodeling client presentation, which drawing type will be the MOST effective?
(A) Plan oblique drawing
(B) Parallel line drawing
(C) Perspective drawings
(D) Orthographic projection drawings -
CORRECT|ANSWER
(C) Perspective drawings
The client has requested to see a mock-up of the wood paneling for a boardroom. Where should the
Designer indicate this requirement?
(A) As a note on the finish schedule
2026/2027 LATEST UPDATE | QUESTIONS AND VERIFIED ANSWERS
| GRADED A+
In terms of occupant health, which of the following lamp types is BEST used in a bedroom?
(A) LED lamp
(B) Fluorescent lamp
(C) Incandescent lamp
(D) Clear mercury vapor lamp -
CORRECT|ANSWER
(C) Incandescent lamp
A digital signage monitor is going to be installed in an elevator lobby, with the bottom edge at 36"
[914 mm] AFF. What does the designer need to confirm with the signage vendor?
(A) The monitor depth will not project into the corridor
(B) The monitor depth will not project more than 4" [102 mm] into the corridor (C) The monitor
depth will not project more than 7" [178 mm] into the corridor (D) The monitor depth will not
project more than 12" [305 mm] into the corridor -
CORRECT|ANSWER
(B) The monitor depth will not project more than 4" [102 mm] into the corridor
When designing a stair with open risers, what is the maximum opening between treads?
(A) The opening must not allow a 2" [51 mm] sphere to pass through
(B) The opening must not allow a 4" [102 mm] sphere to pass through (C) The opening
must not allow a 7" [178 mm] sphere to pass through
(D) The opening must not allow an 11" [279 mm] sphere to pass through -
CORRECT|ANSWER
(B) The opening must not allow a 4" [102 mm] sphere to pass through
Which wall construction will provide the BEST speech privacy for a conference room?
(A) Full height 1/2" thick frameless glass storefront system with frosted film
(B) Full height 3/4" thick frameless glass storefront system with frosted film
, (C) Full height wood stud with one layer of 5/8" thick gypsum board on each side (D) Full height
metal stud with one layer of 5/8" thick gypsum board on each side -
CORRECT|ANSWER
(D) Full height metal stud with one layer of 5/8" thick gypsum board on each side
What is the typical height of the cut plane, when generating a floor plan?
(A) At the floor line
(B) 4'-0" [1210 mm] above the floor line (C) 6' 0" [1828 mm] above the floor line (D) 8' 0" [2420 mm]
above the floor line -
CORRECT|ANSWER
(B) 4'-0" [1210 mm] above the floor line
An abstract diagram that represent the program's spaces, activities, and circulation patterns is called
a:
(A) bubble diagram
(B) adjacency matrix
(C) blocking diagram
(D) preliminary space plan -
CORRECT|ANSWER
(A) bubble diagram
For a kitchen remodeling client presentation, which drawing type will be the MOST effective?
(A) Plan oblique drawing
(B) Parallel line drawing
(C) Perspective drawings
(D) Orthographic projection drawings -
CORRECT|ANSWER
(C) Perspective drawings
The client has requested to see a mock-up of the wood paneling for a boardroom. Where should the
Designer indicate this requirement?
(A) As a note on the finish schedule
