When it's bad luck to meet a black cat?

What you cannot hold but it is yours?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

Why do we preferably have round manhole covers and not square ones?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Replace the question mark in the picture below.

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Can you decipher the two rows to find the hidden word?