Which one of the following is not a cube?

Question

Accepted Answer

Option 2, Guava, is the correct answer because it is not a cube. A cube is a three-dimensional geometric shape with six equal square faces, twelve equal edges, and eight vertices. Let's examine each option to understand why Guava is the correct choice:

1. **Brick**: Bricks are typically rectangular prisms, which means they have a shape similar to a cube but are not perfect cubes. However, some bricks can be manufactured in a cubic shape, especially decorative or specific-purpose bricks. Therefore, a brick can potentially be a cube.

2. **Guava**: Guavas are fruits that are naturally spherical or oval in shape. They do not have flat faces, equal edges, or vertices, which are characteristics of a cube. Therefore, a guava cannot be a cube, making it the correct answer.

3. **Book**: Books are generally rectangular prisms, similar to bricks. While they are not perfect cubes, books can be designed in a cubic shape, especially small or square books. Thus, a book can potentially be a cube.

4. **A box**: A box can be designed in various shapes, including a cube. Many boxes are manufactured as cubes for packaging purposes, with equal dimensions on all sides. Therefore, a box can be a cube.

In conclusion, Option 2, Guava, is the correct answer because it is the only option that cannot be a cube due to its natural, non-geometric shape.