How can you make number one disappear by adding something to it?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

What can go through glass without breaking it?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?