What is always in front of you but can’t be seen?

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

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Forwards I am heavy, backward I am not. What am I?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?