Why do we preferably have round manhole covers and not square ones?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

The answer I give is yes, but what I mean is no. What was the question?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

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?