It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

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 cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

I know a nine-letter word having only one vowel.
Do you ?

What has many teeth, but cannot bite?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

There is a place where if I stand up straight, I will still be considered sideways.

How many times in a given day, minutes and hour clock comes in a straight line ?