How many times in a given day, minutes and hour clock comes in a straight line ?

What brings you down but never up?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Can you find out which options fits best with the missing column?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

I shave every day, but my beard stays the same. What am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

In the picture given below, can you find out which digit will take place of the question mark?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.