Visualising Solid Shapes

Short Answer Questions(SAQs)

What are the uses of 3D objects?

3D models are used to portray real-world and conceptual visuals for art, entertainment, simulation and drafting.

What is a cross section?

A cross section is the non-empty intersection of a solid body in three-dimensional space with a plane, or the analog in higher-dimensional spaces.

What is an isometric sketch?

Isometric Sketch is a pictorial representation of an object in which all three dimensions are drawn at full scale.

MCQs

1. Which of the following is a three-dimensional shape?

(a) Circle

(b) Square

(c) Cube

(d) Triangle

► (c) Cube has three dimensions: length, breadth, and height.

2. What is the face of a 3D shape?

(a) A flat surface

(b) A curved edge

(c) A vertex

(d) None

► (a) A face is a flat surface on a 3D shape.

3. How many vertices does a cube have?

(a) 6

(b) 8

(c) 10

(d) 12

► (b) A cube has 8 vertices.

4. What is the name of a 3D shape with 6 square faces?

(a) Cuboid

(b) Cone

(c) Cube

(d) Cylinder

► (c) Cube has 6 square faces.

5. Which shape has only one curved surface?

(a) Cone

(b) Cylinder

(c) Sphere

(d) Cube

► (c) Sphere has only one curved surface and no edges or vertices.

6. Which of the following has no vertex?

(a) Cube

(b) Cone

(c) Sphere

(d) Pyramid

► (c) Sphere has no vertex.

7. How many faces does a cone have?

(a) 1

(b) 2

(c) 3

(d) 0

► (b) A cone has 1 flat face (base) and 1 curved surface.

8. What is the flat surface of a cylinder called?

(a) Face

(b) Curved surface

(c) Base

(d) Edge

► (c) Base is the flat circular surface of a cylinder.

9. How many faces does a cuboid have?

(a) 4

(b) 5

(c) 6

(d) 8

► (c) A cuboid has 6 faces.

10. What is an isometric view used for?

(a) Measurement

(b) Shading

(c) Drawing 2D views

(d) Representing 3D objects

► (d) Isometric views help represent 3D objects pictorially.

11. What do we call the point where three or more edges meet?

(a) Vertex

(b) Face

(c) Edge

(d) Line

► (a) The point is called a vertex.

12. Cross section of a cylinder cut parallel to base is:

(a) Square

(b) Rectangle

(c) Triangle

(d) Circle

► (d) The cross section parallel to the base of a cylinder is a circle.

13. A cube is a special case of:

(a) Sphere

(b) Cone

(c) Cuboid

(d) Cylinder

► (c) Cube is a special case of cuboid with all edges equal.

14. A cylinder has:

(a) 1 face

(b) 2 faces

(c) 3 faces

(d) 4 faces

► (c) A cylinder has 2 flat circular faces and 1 curved face.

15. What is the minimum number of planes needed to make a cuboid?

(a) 2

(b) 4

(c) 6

(d) 8

► (c) 6 planes (rectangles) are required to form a cuboid.

16. Which shape has no edge?

(a) Cube

(b) Sphere

(c) Cone

(d) Cylinder

► (b) A sphere has no edge, vertex, or flat face.

17. Isometric drawings are:

(a) Top view

(b) Front view

(c) Pictorial view

(d) Cross-sectional view

► (c) Isometric drawings show 3D objects pictorially.

18. A cube has how many edges?

(a) 8

(b) 10

(c) 12

(d) 14

► (c) A cube has 12 edges.