Why Aeroplane windows are round?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Can you solve the below tricky visual equation?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

When 99 is considered higher than 100?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

What does this Rebus Picture means ?