# Solid Modelling MCQ – Set 6

This set of Solid Modelling Multiple Choice Questions & Answers (MCQs) focuses on “Geometry and Topology”.

1. What does the geometric data information of solid model consist of?
a) Shape and size of geometric elements
b) Non-graphical and relational information of geometric elements
c) Connectivity and associativity of geometric elements
d) Shape, size and location of geometric elements

Explanation: The geometric data information of solid model consists of shape, size and location of geometric elements. It consists of actual dimensions that define the entities of the elements. Whereas the topological data of solid consists of non-graphical and relational information of geometric elements.

2. Which of the following option defines the solid model correctly?
a) Valid representation of objects
b) Complete, valid and unique representations of objects
c) Complete, valid and unambiguous representations of objects
d) Valid and unambiguous representations of objects

Explanation: Solid model is defined as the complete, valid and unambiguous representations of objects. A complete solid enables a point in space to be classified relative to the object. A valid solid is one that does not have any dangling edges or faces. An unambiguous solid has only one interpretation of object. Therefore, validity, completeness, unambiguity of an object defines the solid model.

3. Which mathematician provided the criteria to check the validness of solid?
a) Leonhard Euler
b) Carl Gauss
c) Georg Cantor
d) Euclid

Explanation: Leonhard Euler is the mathematician provided the criteria to check the validness of solid. He proved that polyhedra are topologically valid if they satisfy Euler’s equation. It gives the relation between faces, vertices and edges of an object. If the object satisfies this Euler’s relation, it is considered as the valid solid.

4. Which of the following type of model requires stored information of geometry and topology to represent the object?
a) Solid
b) Surface
c) Wireframe
d) Curve

Explanation: Solid model requires stored information of geometry and topology to represent the object, which results in accurate design and better automation of the manufacturing process. Wireframe and surface models require only geometrical data, while curve models are defined using analytic functions.

5. What parameters should be defined in order to design a solid modeling system?
a) Domain, primitives, operators, data structure
b) Domain, primitives, boundary conditions, operators
c) Domain, primitives, operators
d) Domain, primitives, boundary conditions

Explanation: In order to design a solid modeling system, the domain of presentation, basic elements that is primitives must be defined. Proper operators which helps the user to build complex functions must be defined. Finally, data structure is required to store all the information. Hence, the parameters required to design a system are domain, primitives, operators, data structure.

6. Topology of solid is the nongraphical relational information that is stored in solid model databases and is visible to users.
a) True
b) False

Explanation: Topology of solid is the connectivity and associativity of the object entities and determines the relational information between them. From a user point of view, geometry is visible. But topology is stored in solid model databases and hence, not visible to users.

Sanfoundry Global Education & Learning Series – Solid Modelling.