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?

who is silent in the parliament?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Can you find the six hidden animals in the picture below?

Find the hidden tiger in the given optical illusion ?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Rearrange the letters in "new door" to make one word.

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.