This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Basics of Solids – 1”.

1. The minimum number of orthographic view required to represent a solid on flat surface is _________

a) 1

b) 2

c) 3

d) 4

View Answer

Explanation: A solid has 3 dimensions length, breadth and thickness. A single view represents any of the two dimensions of a solid and other represents, other set of two dimensions, so that we can understand whole geometry.

2. Match the following

Polyhedron | Number of faces | ||

1. | Triangular Prism | i. | 6 |

2. | Tetrahedron | ii. | 5 |

3. | Octahedron | iii. | 4 |

4. | Cube | iv. | 8 |

a) 1, i; 2, ii; 3, iii; 4, iv

b) 1, ii; 2, iii; 3, iv; 4, i

c) 1, ii; 2, iv; 3, i; 4, iii

d) 1, iv; 2, iii; 3, ii; 4, i

View Answer

Explanation: A polyhedron is defined as a solid bounded by planes called faces. Prism is a polyhedron having two equal and similar faces (bases or ends), parallel to each other and joined by other faces which are rectangles.

3. Match the following

Prisms | Number of edges | ||

1. | Triangular | i. | 18 |

2. | Square | ii. | 15 |

3. | Pentagon | iii. | 9 |

4. | Hexagonal | iv. | 12 |

a) 1, i; 2, ii; 3, iii; 4, iv

b) 1, iii; 2, ii; 3, iv; 4, i

c) 1, iii; 2, iv; 3, ii; 4, i

d) 1, iv; 2, iii; 3, ii; 4, i

View Answer

Explanation: Prism is a polyhedron having two equal and similar faces (bases or ends), parallel to each other and joined by other faces which are rectangles. So there exist 3 x number of sides of base of edges in prism.

4. The number of corners that exist in pyramids is 1+ number of sides of base.

a) True

b) False

View Answer

Explanation: A pyramid is a polyhedron having a plane figure as a base and a number of triangular faces meeting at a point called vertex or apex. The imaginary line joining the apex with the center of the base is its axis.

5. Match the following

Prisms | Number of vertices | ||

1. | Triangular | i. | 12 |

2. | Square | ii. | 10 |

3. | Pentagon | iii. | 6 |

4. | Hexagonal | iv. | 8 |

a) 1, i; 2, ii; 3, iii; 4, iv

b) 1, iii; 2, ii; 3, iv; 4, i

c) 1, iii; 2, iv; 3, ii; 4, i

d) 1, iv; 2, iii; 3, ii; 4, i

View Answer

Explanation: Prism is a polyhedron which has two equal faces (bases or ends), parallel to each other and joined by other faces which are rectangles. So there exist 2 x number of sides of base of vertices in prism.

6. Solid of revolution gets same shapes in at least two in three orthographic views.

a) True

b) False

View Answer

Explanation: Solids of revolutions are formed by revolving particular shaped plane surface about particular axis or about one of sides of plane surface so generally because of this any two orthographic views look similar.

7. If a right angled triangle is made to revolute about one of its perpendicular sides the solid formed is ________

a) cube

b) triangular prism

c) cone

d) cylinder

View Answer

Explanation: A right circular cone is a solid generated by the revolution of a right angled triangle about one of its perpendicular sides which is fixed. It has one circular base and one vertex. Its axis joins the vertex to center of circle (base) to which it is perpendicular.

8. Match the following

Polyhedron | Number of faces | ||

1. | Triangular Prism | i. | 8 |

2. | Tetrahedron | ii. | 9 |

3. | Octahedron | iii. | 6 |

4. | Cube | iv. | 12 |

a) 1, i; 2, ii; 3, iii; 4, iv

b) 1, ii; 2, iii; 3, iv; 4, i

c) 1, ii; 2, iv; 3, i; 4, iii

d) 1, iv; 2, iii; 3, ii; 4, i

View Answer

Explanation: A polyhedron is defined as a solid bounded by planes called faces. Prism is a polyhedron having two equal and similar faces (bases or ends), parallel to each other and joined by other faces which are rectangles.

9. Match the following

Prisms | Number of vertices | ||

1. | Triangular | i. | 7 |

2. | Square | ii. | 6 |

3. | Pentagon | iii. | 5 |

4. | Hexagonal | iv. | 4 |

a) 1, i; 2, ii; 3, iii; 4, iv

b) 1, iii; 2, ii; 3, iv; 4, i

c) 1, iii; 2, iv; 3, ii; 4, i

d) 1, iv; 2, iii; 3, ii; 4, i

View Answer

Explanation: A pyramid is a polyhedron having a plane figure as a base and a number of triangular faces meeting at a point called vertex or apex. So there exists 1+ number of sides of base of vertices in pyramid. In pyramid the number of vertices is equal to number of faces.

10. Match the following

Prisms | Number of vertices | ||

1. | Triangular | i. | 12 |

2. | Square | ii. | 8 |

3. | Pentagon | iii. | 6 |

4. | Hexagonal | iv. | 10 |

b) 1, iii; 2, ii; 3, iv; 4, i

c) 1, iii; 2, iv; 3, ii; 4, i

d) 1, iv; 2, iii; 3, ii; 4, i

View Answer

Explanation: A pyramid is a polyhedron having a plane figure as a base and a number of triangular faces meeting at a point called vertex or apex. The imaginary lie joining the apex with the center of the base is its axis. So there exists 2 x number of sides of base of edges in a pyramid.

11. When a pyramid or a cone is cut by a plane parallel to its base, thus removing the top portion, the remaining portion is called ___________

a) cylinder

b) frustum

c) prism

d) polyhedron

View Answer

Explanation: When a pyramid or a cone is cut by a plane parallel to its base, thus removing the top portion, the remaining portion is called its frustum. When a solid is cut by a plane inclined to the base it is said to be truncated.

12. Straight lines drawn from the apex to the circumference of the base-circle are all equal and are called ____________

a) edges

b) connecting lines

c) projectors

d) generators

View Answer

Explanation: In a cone, the straight lines drawn from the apex to the circumference of the base-circle are all equal and are called generators of the cone. The length of the generator is the slant height of the cone.

13. The solid formed by 12 equal and regular pentagons as faces is called __________

a) plantonic solid

b) dodacahedron

c) Icosahedron

d) pyritohedron

View Answer

Explanation: Plantonic solid is a regular convex polyhedron. Dodecahedron is one of the plantonic solid. Icosahedron is a solid which has twenty equal sized equilateral triangles as faces. Pyritohedron is the irregular dodecahedron.

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