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100+ Free LC DCG Practice Questions

Leaving Certificate Design and Communication Graphics (Ireland) practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: LC DCG Exam

40% + 60%

Student assignment and terminal paper weightings of the overall DCG grade

NCCA Design and Communication Graphics syllabus

CAD compulsory

CAD is a significant compulsory element of the student assignment

NCCA Design and Communication Graphics syllabus

~40 hours

Syllabus guidance for approximate student assignment completion time

NCCA Design and Communication Graphics syllabus

2 options

Students study two Applied Graphics optional areas in addition to the core

NCCA Design and Communication Graphics syllabus

HL and OL

Design and Communication Graphics is examined at Higher Level and Ordinary Level

Curriculum Online - Design and Communication Graphics

H1-H8 / O1-O8

Results use the eight-point Higher and Ordinary grade scales

State Examinations Commission grading scale

3 hours

Typical duration of the terminal DCG examination paper (confirm SEC timetable)

SEC examination practice / school subject outlines

100

Free original single-best-answer practice questions in this bank

OpenExamPrep

Leaving Certificate Design and Communication Graphics (DCG, Ireland) is a senior-cycle SEC subject combining projection systems, plane and solid geometry, developments, design communication and parametric CAD concepts. It is assessed by a student assignment (40%, CAD compulsory) and a terminal drawing paper (60%, typically 3 hours). Grades use the H1-H8 / O1-O8 scale. Official papers are not MCQ; this free bank offers 100 original single-best-answer study questions.

Sample LC DCG Practice Questions

Try these sample questions to test your LC DCG exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In Irish Leaving Certificate Design and Communication Graphics, multi-view technical drawings are normally presented using which orthographic convention?
A.Third-angle projection only
B.First-angle projection
C.Perspective projection only
D.Oblique cavalier projection only
Explanation: Irish DCG (and much of Europe) uses first-angle orthographic projection for conventional multi-view layouts. Higher Level candidates are also expected to be familiar with third-angle projection, but first-angle is the standard presentation convention at both levels.
2What is the main purpose of an orthographic multi-view drawing of a manufactured part?
A.To hide hidden edges deliberately in every view
B.To show only one artistic sketch of the object
C.To describe the object completely with measurable two-dimensional views
D.To replace all dimensions with colour only
Explanation: Orthographic multi-view drawings use logically arranged 2D views (for example plan and elevations) so shape, size and features can be measured and manufactured from the drawing set.
3In first-angle projection, where is the plan view typically placed relative to the front elevation?
A.Always on a separate unrelated sheet only
B.Above the front elevation
C.Inside the front elevation outline
D.Below the front elevation
Explanation: In first-angle projection the object is imagined between the observer and the plane of projection; the plan is projected onto the horizontal plane and, in the conventional layout, appears below the front elevation.
4Which line type is conventionally used to show hidden edges in an orthographic view?
A.Dashed (hidden detail) line
B.Wavy break line only
C.Chain centre line only
D.Continuous thick outline only
Explanation: Hidden edges that are not visible from a particular viewing direction are shown with dashed hidden-detail lines so the complete geometry can still be read.
5An isometric drawing is a type of which broader projection family?
A.Axonometric (pictorial) projection
B.First-angle orthographic multi-view only
C.One-point perspective only
D.Geologic contour mapping only
Explanation: Isometric projection is a form of axonometric pictorial projection in which the three principal axes are equally inclined to the plane of projection, giving a 3D-looking single view with equal foreshortening along the axes.
6In a standard isometric drawing, what angle is commonly used between the two receding horizontal axes on the paper?
A.30° to the horizontal for each receding axis (120° between axes)
B.60° to the vertical for both axes only
C.90° and 0° only
D.45° and 15° only
Explanation: In the common isometric setup, the two plan axes are drawn at 30° to the horizontal base line so the three isometric axes are 120° apart, and vertical edges remain vertical.
7What is a vanishing point in perspective drawing?
A.A point that must lie on the ground line only
B.The geometric centre of every solid always
C.The point on the horizon (or its projection) where a set of parallel lines appears to meet
D.The intersection of two orthographic elevation planes only
Explanation: In linear perspective, lines that are parallel in space (and not parallel to the picture plane) converge visually toward a vanishing point, commonly associated with the horizon for horizontal lines.
8One-point (parallel) perspective is most appropriate when which condition holds?
A.One principal face of the object is parallel to the picture plane
B.Only orthographic hidden lines are used
C.The object is always drawn without a horizon line
D.No face is parallel to any reference plane
Explanation: In one-point perspective a principal face is parallel to the picture plane, so only the receding edges converge to a single vanishing point.
9Which conic section is formed when a right circular cone is cut by a plane parallel to a generator (slant) of the cone?
A.An ellipse only
B.A circle
C.A parabola
D.A hyperbola only
Explanation: A plane parallel to a generator of a right circular cone intersects the cone in a parabola. A circle is a special ellipse from a plane perpendicular to the axis; an ellipse from an inclined plane cutting all generators; a hyperbola from a plane steeper than a generator (cutting both nappes in the complete cone).
10In the focus–directrix definition of a conic, eccentricity e is the ratio of which two distances from a point on the curve?
A.Distance to the focus divided by distance to the directrix
B.Distance to the vertex divided by major-axis length only
C.Radius of curvature divided by chord length only
D.Minor axis divided by major axis only
Explanation: By definition, for any point P on a conic, PF / (distance from P to the directrix) = e, the eccentricity. Values e < 1, e = 1 and e > 1 identify ellipse, parabola and hyperbola respectively.

About the LC DCG Practice Questions

Verified exam format metadata for Leaving Certificate Design and Communication Graphics (Ireland) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.