Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

If you say my name, I will no longer exist. What am I?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

If 1+9+8=1, what is 2+8+9?

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???

What kind of band never plays music?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

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?