List of top Questions asked in UCEED

The figure shows illustrations of six metal rods which have internal or external screw thread patterns at their ends. The shaded portion in the figure shows the cross section view. What is the maximum length possible by connecting the rods? Threads cannot be connected partially.
six metal rods which have internal or external screw thread patterns
The image is a ceramic tile of dimension 20 cm × 20 cm. How many distinct patterns can you create by using two such ceramic tiles in a rectangular patch of 40 cm × 20 cm on the wall?
The image of a ceramic tile
Twenty points are arranged on a plane as shown in the figure below. What is the highest number of squares that can be drawn using any four points as corners?
the highest number of squares that can be drawn using any four point