Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What is the riddle which can be asked all day with a different correct answer each time.

Which five letter word can be added at the end of below word to form a
valid word?

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Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Before Mount Everest was discovered, what was the highest mountain in the world?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?