This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Basics of Solids – 2”.

1. At Least two orthographic views are necessary to represent a 3D solid in 2D, flat surface.

a) True

b) False

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Explanation: A solid in 3D has length, breadth, and thickness as its three dimensions, to represent them on a 2D flat surface we need at least two orthographic views. Even projections on auxiliary planes are sometimes necessary, for a complete description of a solid.

2. _______________ has four equal faces, and all are equilateral triangles.

a) Hexahedron

b) Tetrahedron

c) Octahedron

d) Icosahedron

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Explanation: Solids are divided into polyhedra and solids of revolution. In polyhedra solids, when all faces are equal and regular called as regular. These tetrahedrons have four equilateral triangles as faces.

3. Icosahedron has _________________ and all are equilateral triangles.

a) Ten faces

b) Twenty Faces

c) Twelve faces

d) Eight faces

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Explanation: Solids are divided into polyhedra and solids of revolution. In polyhedra solids, when all faces are equal and regular called as regular. This Icosahedron has twenty equilateral triangles as faces.

4. Prism is polyhedron with at least __________ equal and parallel.

a) Three Faces

b) Two Faces

c) Six faces

d) Eight faces

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Explanation: Solids are divided into polyhedra and solids of revolution. In polyhedra solids, Prism is having two faces equal and similar at its ends, which are parallel to each other.

5. A right and regular prisms axis is ______________ to its base.

a) Parallel

b) Perpendicular

c) 30 Inclined

d) 45 Inclined

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Explanation: In polyhedra solids, Prism is having two faces equal and similar at its bases, which are parallel to each other. The axis is an imaginary line passing through the center of the bases, in regular and right prisms axis is perpendicular to the bases.

6. A right and regular prisms has equal and regular ______________ faces excluding its bases.

a) Rectangle

b) Isosceles triangle

c) Circle

d) Pentagonal

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Explanation: In polyhedra solids, Prism is having two faces equal and similar at its bases, which are parallel to each other. The axis is an imaginary line passing through the center of the bases, in regular and right prisms axis is perpendicular to the bases and has equal and regular rectangles as its faces excluding its bases.

7. A right and regular pyramids has equal and regular ______________ faces excluding its bases.

a) Rectangle

b) Isosceles triangle

c) Circle

d) Pentagonal

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Explanation: In polyhedra solids, Pyramids are having a base and number of triangular faces converging at the vertex or apex. The axis is an imaginary line passing through the center of the base to the apex, in regular and right prisms axis is perpendicular to the bases and has equal and regular isosceles triangles as its faces excluding its base.

8. __________ is generated by revolving the rectangle, around one of its sides which is kept fixed.

a) Cylinder

b) Cone

c) Sphere

d) Frustum

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Explanation: Solids are divided into polyhedra and solids of revolution. The cylinder is a solid of revolution. It is formed by revolving the rectangle, around one of its sides which is kept fixed.

9. Cone is generated by revolving _____________, around one of its perpendicular sides which is kept fixed.

a) Right-angled triangle

b) Rectangle

c) Square

d) Half-rectangle

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Explanation: Solids are divided into polyhedra and solids of revolution. Cone is a solid of revolution. It is formed by revolving the right-angled triangle, around one of its perpendicular sides which is kept fixed.

10. ______________ is generated by revolving semi-circle, about its diameter which is kept fixed.

a) Cylinder

b) Cone

c) Sphere

d) Frustum

View Answer

Explanation: Solids are divided into polyhedra and solids of revolution. The sphere is a solid of revolution. It is formed by revolving the semi-circle, around its diameter which is kept fixed.

11. Which of the following is a solid of revolution?

a) Prism

b) Pyramid

c) Tetrahedron

d) Cylinder

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Explanation: Solids are divided into polyhedra and solids of revolution. Solids of revolution are formed by revolving a 2D plane around a fixed axis. The cylinder is one such solid of revolution which is formed by revolving semi-circle, revolved around its fixed diameter.

12. Which of the following is a polyhedron?

a) Prism

b) Sphere

c) Cone

d) Cylinder

View Answer

Explanation: Solids are divided into polyhedra and solids of revolution. A polyhedron is a solid formed by bounding planes called faces. When faces are equal and regular, the polyhedron is called regular.

13. Which of the following is regular polyhedron?

a) Prism

b) Sphere

c) Tetrahedron

d) Cylinder

View Answer

Explanation: Solids are divided into polyhedra and solids of revolution. A polyhedron is a solid formed by bounding planes called faces. When faces are equal and regular, the polyhedron is called regular. The tetrahedrons have four equilateral triangles as faces.

14. Which of the following is not a regular polyhedron?

a) Pyramid

b) Tetrahedron

c) Octahedron

d) Icosahedron

View Answer

Explanation: Solids are divided into polyhedra and solids of revolution. A polyhedron is a solid formed by bounding planes called faces. When faces are equal and regular, the polyhedron is called regular. In polyhedra solids, Pyramids are having a base and number of triangular faces converging at the vertex or apex.

15. When a cone is cut by a plane parallel to its base, and by removing a top portion of the remaining part is called____________

a) Truncated

b) Frustum

c) Prism

d) Irregular-prism

View Answer

Explanation: Frustum is a remaining portion of the pyramid or cone when they are cut by a plane parallel to their bases, and the top portion is removed.

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