Those 10 blocks are different from the normal blocks. They can be acquired with the help of commands and some of them can be very useful because of the features that they provide :)

The video tutorial for those secret blocks in Minecraft is located here - https://www.youtube.com/watch?v=Ywa9x_5pfUg
and more videos like this one can be found here - https://www.youtube.com/playlist?list=PLIRR9clro4hRjpNnI46YvEon4oeWbJRV4

If you prefer text, the commands are written below:

Commands:

1. Piston Head (Block 34) - /setblock ~ ~ ~ piston_head

2. Piston Extension (Block 36) - /setblock ~ ~ ~ piston_extension

3. 6-faced Log - /summon FallingSand ~ ~ ~ {Time:1,TileID:17,Data:12,DropItem:0} OR
/setblock ~ ~ ~ log 12
4. Missing Texture - /summon FallingSand ~ ~ ~ {Time:1,TileID:33,Data:14,DropItem:0} OR /setblock ~ ~ ~ sticky_piston 14

OR

/setblock ~ ~ ~ piston_head 15
(you will be able to walk through it)

5. Full Stone Slab - /summon FallingSand ~ ~ ~ {Time:1,TileID:43,Data:8,DropItem:0} OR /setblock ~ ~ ~ double_stone_slab 8

6. Smooth Sandstone - /summon FallingSand ~ ~ ~ {Time:1,TileID:43,Data:9,DropItem:0} OR /setblock ~ ~ ~ double_stone_slab 9

7. Lit Furnace - /setblock ~ ~ ~ lit_furnace

8. Nether Portal - /setblock ~ ~ ~ portal

End Portal - /setblock ~ ~ ~ end_portal

9. Pumpkin & Melon Stems - minecraft.gamepedia.com/Technical_blocks#Pumpkin_Stem

10. Piston destroying blocks upon being placed - /summon FallingSand ~ ~ ~ {Time:1,TileID:33,Data:11,DropItem:0} OR /setblock ~ ~ ~ piston 11

Information in this video was gathered from http://minecraft.gamepedia.com/

Thanks for watching and/or reading! :)1