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Quiz Chapter 7: Plans and Elevations

10 questions · Form 3 Mathematics Bab 7: Plans and Elevations

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. A square pyramid has a base of 6 cm × 6 cm and height of 8 cm. What shape is its Front Elevation when viewed facing one side of the base?

  1. Square
  2. Isosceles Triangle
  3. Right-angled Triangle
  4. Rectangle
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Answer: B

When viewed perpendicular to one of the base edges, the front elevation of a regular square pyramid is an isosceles triangle with base 6 cm and height 8 cm.

2. What is the orthogonal projection of a straight line segment that is perpendicular to the projection plane?

  1. A point
  2. A line of equal length
  3. A triangle
  4. A dashed line
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Answer: A

When a line segment is perpendicular to the projection plane, all points on the line project onto a single point.

3. When drawing plans and elevations, what does a solid line represent?

  1. Hidden edges
  2. Visible edges
  3. Projection lines
  4. Symmetry axes
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Answer: B

Solid continuous lines represent edges and outlines that are directly visible from the viewing direction.

4. A rectangular block has a step cut out from its top edge. From the front, this step edge cannot be seen directly. How should this edge be represented in the Front Elevation?

  1. Solid line
  2. Dashed line
  3. It should be omitted
  4. Red line
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Answer: B

Features or edges that exist on the object but are hidden from the specific viewing angle must be drawn using dashed lines.

5. A hollow pipe (a cylinder with a concentric cylindrical hole) is viewed from the top. What is its Plan?

  1. Two solid concentric circles
  2. A single solid circle
  3. A solid circle with an inner dashed circle
  4. A rectangle with dashed vertical lines
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Answer: A

Viewed from above, both the outer edge and inner hole edges are visible, so they are drawn as two solid concentric circles.

6. A cuboid has dimensions 5 cm (length) × 3 cm (width) × 4 cm (height). What are the dimensions of its Plan?

  1. 5 cm × 4 cm
  2. 3 cm × 4 cm
  3. 5 cm × 3 cm
  4. 5 cm × 5 cm
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Answer: C

The Plan shows the top view, which consists of the length and width dimensions: 5 cm × 3 cm.

7. Which view allows us to measure the height of a 3D object?

  1. Plan only
  2. Front Elevation and Side Elevation
  3. Plan and Front Elevation
  4. Plan and Side Elevation
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Answer: B

Height is a vertical dimension, which is visible in both the Front Elevation and Side Elevation, but NOT in the Plan (top view).

8. Why are projection lines (construction lines) drawn lightly in plans and elevations?

  1. They represent hidden object features
  2. They are temporary guide lines used to align corresponding dimensions between views
  3. They show interior solid structures
  4. They indicate paper boundaries
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Answer: B

Construction lines are thin guidelines used to transfer dimensions and maintain alignment between the Plan, Front, and Side elevations.

9. In a technical drawing, what type of line is used to represent hidden edges of an object?

  1. Thick continuous line
  2. Dashed line
  3. Thin continuous line
  4. Chain line
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Answer: B

Dashed lines are used to show edges or outlines that are hidden from view in a given perspective.

10. If a cylinder with radius 3 cm and height 8 cm is viewed from the side, what shape is its side elevation?

  1. Circle
  2. Rectangle
  3. Triangle
  4. Oval
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Answer: B

The side view of a cylinder projected onto a vertical plane is a rectangle with width equal to the diameter (6 cm) and height 8 cm.

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