Ans 2:
Class : Class 5
The Ball can roll. As cube has flat surface it can slide. so correct answer should be cube
Ans 3:
Class : Class 6
Yes, ball rolls as it's sphere shape. Flat surface objects slide. So, this is wrong answer given by the team.
Ans 5:
Class : Class 2
The ball can 'roll'. Can it be considered as sliding? Moreover, if a cube/cuboid is placed in a slanting surface, it can slide