RBSE Solutions Class 6 Maths Chapter 10 Understanding Three Dimensional Shapes Important Questions

Question 1. Circle is an example of
(i) one dimensional figure
(ii) two dimensional figure
(iii) three dimensional figure
(iv) none of these
Answer: (ii) two dimensional figure
In simple words: A circle is flat and can be drawn on a piece of paper. This means it only has length and width, making it a two-dimensional shape.
🎯 Exam Tip: Remember that two-dimensional figures have only length and width, while three-dimensional figures also have height or depth.

Question 2. Every flat surface of a cuboid is
(i) rectangular
(ii) square
(iii) circular
(iv) none of these
Answer: (i) rectangular
In simple words: If you look at any side of a cuboid, like a brick or a shoebox, you will see that it is always shaped like a rectangle. A cuboid has six flat rectangular faces.
🎯 Exam Tip: Visualize common cuboid objects around you, such as a matchbox or a book, to easily recall the shape of their faces.

Question 3. Joker's cap is an example of
(i) cube
(ii) cuboid
(iii) circle
(iv) cone
Answer: (iv) cone
In simple words: A joker's cap is shaped like a cone, which has a circular base and a curved side that tapers to a point at the top. This shape helps it sit well on the head.
🎯 Exam Tip: Identify real-world objects that resemble geometric shapes to understand their properties better.

Question 4. Number of vertices in dice are
(i) 5
(ii) 15
(iii) 25
(iv) 8
Answer: (iv) 8
In simple words: A die (one dice) is a cube. A cube has corners, and each corner is called a vertex. If you count the corners of a cube, you will find eight of them.
🎯 Exam Tip: Knowing the number of faces, edges, and vertices for basic 3D shapes like cubes and cuboids is fundamental.

Question 5. Base of cone will be
(i) circular
(ii) rectangular
(iii) square
(iv) none of these
Answer: (i) circular
In simple words: A cone, like an ice cream cone, stands on a flat base that is always round. This round shape is called a circle.
🎯 Exam Tip: Remember that a cone has one circular base and a curved surface leading to a single vertex (apex).

Question 6. Number of sides in polygon is
(i) 5
(ii) 15
(iii) 25
(iv) Can be any
Answer: (iv) Can be any
In simple words: A polygon is a closed shape made of straight lines. It can have any number of sides, as long as it has at least three. For example, a triangle has 3 sides, a square has 4, and so on.
🎯 Exam Tip: The definition of a polygon is broad; it refers to any closed figure formed by straight line segments, with the number of sides varying.

Question 1. Fill in the blanks
(i) Surfaces of solids which slide are flat surfaces and which roll are called _____.
(ii) The solid shapes which have three measures namely length, breadth, height are depth are called _____.
(iii) Each surface of a cuboid is a _____.
(iv) A cube has _____ faces, _____ vertices and _____ edges.
(v) A solid shape which has two circular flat surfaces and one curved surface called _____.
(vi) A solid shape which has one circular flat surface and one curved surface called _____.
(vii) The solid shape which has all flat faces and each face is a polygon is called a _____.
Answer:
(i) Curved surface
(ii) Three dimensional shapes
In simple words: Objects that can roll have curved surfaces. Shapes that you can measure in three ways (length, width, and height) are called three-dimensional, like a real-world object.
🎯 Exam Tip: Understand the basic characteristics that differentiate flat surfaces from curved surfaces and two-dimensional from three-dimensional shapes.

Short Answer Type Questions

Question 1. Write four examples of two dimensional shape.
Answer: Four examples of two-dimensional shapes are a circle, a square, a rectangle, and a triangle. These shapes are flat and only have length and width. They can be drawn on a piece of paper.
In simple words: Some flat shapes are circles, squares, rectangles, and triangles.
🎯 Exam Tip: Always include distinct examples for such questions to show a broader understanding of the topic.

Question 2. What is called pyramid?
Answer: A pyramid is a special type of solid shape called a polyhedron. It has a base that is a polygon (like a square or triangle) and its other surfaces are triangles. These triangular sides all meet at one single point at the top. The Egyptian pyramids are famous examples.
In simple words: A pyramid has a flat bottom shaped like a polygon and triangle-shaped sides that all meet at one point on top.
🎯 Exam Tip: Key features of a pyramid include a polygonal base and triangular faces meeting at an apex.

Question 3. Define two dimensional shapes.
Answer: Two-dimensional shapes are flat shapes that can only be measured in two directions: length and breadth (or width). They do not have any thickness or depth. For example, a drawing on paper is a two-dimensional shape. These shapes exist only on a plane.
In simple words: Two-dimensional shapes are flat and you can only measure how long and how wide they are.
🎯 Exam Tip: When defining geometric terms, clearly state the key characteristics, like the number of dimensions for 2D shapes.

Question 4. Give three examples of three dimensional shapes.
Answer: Three examples of three-dimensional shapes are a cube, a cuboid, and a cylinder. These shapes have length, width, and height, allowing them to exist in the real world and take up space.
In simple words: Some examples of 3D shapes are a cube, a cuboid, and a cylinder.
🎯 Exam Tip: Ensure your examples are distinct and commonly recognized three-dimensional geometric figures.

Question 5. Match the following shapes with their type and name.
Answer:

Shape (Diagram)	Type	Name
	Three dimensional	Cylinder
	Two dimensional	Square
	Two dimensional	Triangle
	Three dimensional	Cuboid
	Three dimensional	Cube
	Two dimensional	Circle
	Three dimensional	Cone
	Three dimensional	Sphere

In simple words: This table shows different shapes and correctly groups them as either flat (two-dimensional) or solid (three-dimensional), along with their names. It helps us understand what each shape looks like and what kind of space it occupies.
🎯 Exam Tip: To score full marks in matching questions, make sure to accurately pair each item from one column with its correct counterpart in the other.