1All the edges of a cube are equal. Is this statement true or false?
2A cube has five square faces in all. Is this statement true or false?
3A cube has fewer vertices than a cuboid. Is this statement true or false?
4If all the edges of a cuboid are equal in length, that cuboid is called a cube. Is this statement true or false?
5The flat faces of a cuboid are not all equal. Is this statement true or false?
6What is a cube?
7What is meant by the face, the edge and the vertex of a cuboid?
8Write the formula that shows the relation between the faces, edges and vertices of a cuboid.
9Write the main difference between a cube and a cuboid.
10A cube shaped counter has 12 edges in all. How many vertices must it have for the number of its flat faces to be 6?
11A cuboid shaped tank has 6 flat faces in all. How many edges must it have for its number of vertices to be 8?
12How can cubes and cuboids of different sizes be built using empty pen refills, stalks, sticks of bamboo or reed, and thread?
13What is a cylinder? Write any two of its properties.
14Write one likeness and one difference between a cylinder and a cone.
15Write the difference between a sphere and a cylinder.
16What is the difference between a plane shape and a solid object?
17For a cuboid whose eight vertices are lettered A, B, C, D, E, F, G and H, name all six flat faces, pick out the three pairs of parallel faces, and say when this shape becomes a cube.
18Write, with reasons, what shape each of these solids is: a coloured cone, a football, a drinking glass, an ice cream holder and a ball with lines drawn on it.
19A solid has 12 edges and 8 vertices. Use the relation to find the number of its faces.
20Which of a cylinder, a cone and a sphere can be stood upright on a table, and why?
21Choose five objects from your home and write their shapes with reasons.