Q1: Name any four 3D shapes.
Ans: Four 3D shapes are cube, cuboid, cone and cylinder.
Q2: Write the name of the shape of each object.
Ans:
| Object | Shape |
|---|---|
| Dice | Cube |
| Matchbox | Cuboid |
| Water bottle | Cylinder |
| Ice-cream cone | Cone |
Q3: Which 3D shape has no edges and no corners?
Ans: A sphere has no edges and no corners.
Q4: Which 3D shapes have only flat faces?
Ans: Cube and cuboid have only flat faces.
Q5: Which 3D shapes have curved faces?
Ans: Cone, cylinder and sphere have curved faces.
Q6: Count the faces, edges and corners of a cube.
Ans:
| Part | Number |
|---|---|
| Faces | 6 |
| Edges | 12 |
| Corners | 8 |
Note: Corners are also known as vertices.
Q7: A cone is placed on a cylinder, and the cylinder is placed on a cuboid. Write the position of each shape.
Ans: The cone is on top.
The cylinder is in the middle.
The cuboid is at the bottom.
Q8: Name one 3D shape that is found the most in a classroom.
Ans: Cuboid is found the most because desks, books and cupboards are cuboid-shaped.
Q9: Look at a dice. What number is on the face opposite to 1?
Ans: The number opposite to 1 is 6 because the sum of opposite faces always equals 7 (1+6=7, 2+5=7, 3+4=7).
Q10: Join three cubes. Write the different shapes that can be made.
Ans: Three cubes can be joined to make a cuboid.