What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

You see me once in June, twice in November, and not at all in May. What am I?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

Can you decipher the below rebus?

PBLUESAISNUERSES

Name a key which is hardest to turn.

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

Can you place three balls such that the equation shown in the picture holds true?

Which is faster, Heat or Cold ? Explain.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

A man was just doing his job when his suit was torn. Why did he die three minutes later?