If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What building has the most stories?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

What goes through cities and fields, but never moves?

John is found dead in his office at his desk. The police have narrowed the suspects down to three people: Mrs. Jacob, John’s wife Hena and his business partner Jason . All three visited John on the day of his murder, but all three provide the police with stories of explanation as to the reason for their visit.
Police found John with his wrist watch still on his right arm, a torn up picture of his wife laying on the floor beside the trash can, and an ink pen in his right hand. On the desk, the police found a name plate, a telephone that was off the hook, and a personal calendar turned to the July 5th page with 7B91011 written on it. After examining this evidence, the police knew their suspect. Who was it ?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What number when divided in half becomes zero?