When we see 2 but call 10?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

What kind of tree can you carry in your hand?

What do you think with the below Picture ?

What does below pictogram mean?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why is it?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

When can we add 2 to 11 and get 1 as the correct answer?

What does below rebus means ?