Can you find out which number multiplied by itself will give the output as 12345678987654321?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What's a single-digit number with no value?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

Solve the puzzle by telling what does below picture means.

Find out the missing number in the picture attached: