16.
All surfaces of a cube are coloured. If a number of smaller cubes are taken out from it, each side 1/4 the size of the original cube's side, indicate the number of cubes with only one side painted.

18.
The six faces of a solid cube have been painted in different colours. The top of the cube is painted Red and the bottom is painted White. The rest of the four faces have been painted Yellow, Blue, Green and Pink, respectively in clockwise direction. The cube is now turned in such a manner that Blue face is at the top. What will be the colour of the bottom face?

20.
Choose from amongst the alternatives 1, 2, 3 and 4, the box/boxes that is/are similar to the box that will be formed by the sheet of paper when it is folded.
Cubes and Dice mcq question image