📘 Practice Set 3

Chapter 1 – Three-Dimensional Shapes

Section A – Complete the Statements

1. The corner of a 3D shape where edges meet is called a __________.
2. The line where two faces of a 3D shape meet is called an __________.
3. The flat pattern that can be folded to form a 3D shape is called a __________.
4. A shape formed by stacking equal triangles is called a __________.
5. The round boundary of a cone is called a __________ edge.
6. A pyramid gets its name from the shape of its __________.
7. A hexagon has __________ sides.
8. A solid shape with all faces square is called a __________.

Section B – MCQs

1. Which shape has 4 vertices and 6 edges?
   A) Cone   B) Triangular pyramid   C) Cylinder   D) Cube


2. Which shape has 2 circular faces?
   A) Cone   B) Sphere   C) Cylinder   D) Pyramid


3. Which is not a polygon?
   A) Triangle   B) Circle   C) Pentagon   D) Hexagon


4. A pentagonal pyramid has how many vertices?
   A) 5   B) 6   C) 10   D) 12


5. Which shape has one square base and triangular faces?
   A) Square pyramid   B) Cube   C) Cuboid   D) Cylinder


6. Which object looks like a cylinder?
   A) Ball   B) Dice   C) Water bottle   D) Pyramid tent


7. A 1D shape has only:
   A) Width   B) Height   C) Length   D) Surface


8. Which shape has no flat surface?
   A) Sphere   B) Cone   C) Cylinder   D) Cuboid

Section C – Correct the Wrong Statement

1. A cone has two vertices.
2. A sphere has many edges.
3. A triangular prism has 4 vertices.
4. A pyramid has two equal bases.
5. A circle is a polygon.

Section D – Identify the Shape from Clues

1. I have 8 vertices, 12 edges and 6 equal square faces. Who am I?
2. I have 1 vertex, 1 circular face and 1 curved face. Who am I?
3. I have 5 vertices, 8 edges and 4 triangular faces. Who am I?
4. I have 10 vertices, 15 edges and 2 pentagonal faces. Who am I?
5. I am round like a ball and have no vertex. Who am I?

Section E – Match the Shape with its Property

Section F – Reasoning Questions

1. Why is a cylinder not called a pyramid?
2. Why is a triangular prism different from a triangular pyramid?
3. Why does a sphere roll easily?
4. Why can a cuboid stand firmly on a table?
5. Why is a tent often compared with a pyramid?

Section G – Competitive Exam Corner ⭐

1. A prism has a hexagonal base. Find its number of vertices.
2. A pyramid has an octagonal base. Find its number of edges.
3. A prism has 18 edges. How many sides does its base have?
4. A pyramid has 9 vertices. How many sides does its base have?
5. A prism has 7 vertical faces. Name the base polygon.

Section H – Application Questions

1. Which 3D shape is useful for making a dice?
2. Which 3D shape is useful for making a party hat?
3. Which 3D shape is useful for making a storage box?
4. Which 3D shape is useful for making a ball?
5. Which 3D shape is useful for making a pipe?

✅ Solutions

Section A Answers

1. vertex
2. edge
3. net
4. triangular prism
5. circular
6. base
7. 6
8. cube

Section B Answers

1. B) Triangular pyramid
2. C) Cylinder
3. B) Circle
4. B) 6
5. A) Square pyramid
6. C) Water bottle
7. C) Length
8. A) Sphere

Section C Answers

1. A cone has one vertex.
2. A sphere has no edges.
3. A triangular prism has 6 vertices.
4. A pyramid has only one base.
5. A circle is not a polygon because it has no straight sides.

Section D Answers

1. Cube
2. Cone
3. Square pyramid
4. Pentagonal prism
5. Sphere

Section E Answers

1-b, 2-c, 3-a, 4-e, 5-d

Section F Answers

1. A cylinder is not called a pyramid because it has no triangular faces meeting at one top point.
2. A triangular prism has two triangular faces, but a triangular pyramid has triangular faces meeting at one vertex.
3. A sphere rolls easily because it has a curved surface all around.
4. A cuboid can stand firmly because it has flat rectangular faces.
5. A tent is compared with a pyramid because its triangular faces meet at the top.

Section G Answers

1. 12 vertices
2. 16 edges
3. 6 sides
4. 8 sides
5. Heptagon

Section H Answers

1. Cube
2. Cone
3. Cuboid
4. Sphere
5. Cylinder