Which alphabet letter is a question?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

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

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

What is the coolest letter in the alphabet?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?