I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Mr. Buttons was all set to go to the village of Buttonland to meet his friend. So, he packed his bags and left for the village at 5 in the morning. Upon travelling on a road for miles, he came across a point where the road diverged into two. He was confused on which road to take. He gazed around and he saw two owls sitting on a branch. He thought he could ask for directions for the village from the two owls. So he went to the tree. There he saw a sign which read, "One owl always lies, and one is always truthful. They both fly away if you ask them more than 1 question."
Mr. Buttons was caught in the dilemma of what to ask? And from which owl to ask, since he only had one question. What should Mr. Buttons ask?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

Which number comes next in the number series?

2, 9, 30, 93, ?

Can you make four (4) nines (9) equal 100?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

By moving just one matchstick, you need to make the below statement true. Can you do it?

I am white when I am dirty, and black when I am clean. What am I?