There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

What does this rebus mean?

O
N
C
E
TIME

Can you make a six-letter word using the letters N, A and B ?

Different lights make me strange by changing me into different sizes. What am I?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

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

Akbar summoned Birbal out of anger.
He told him that he will have to face death.
He asked him to make a statement and if the statement is true he will be buried alive and if the statement is false, he will be thrown at lions.
After hearing Birbal’s statement, Akbar could do nothing but smile.
He gave him 5 gold bars and let him go.

What did Birbal say?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.