Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

Which Burger Is Different in below image?

Give it food and it will live; give it water and it will die.

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

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.

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

During which month do people sleep the least?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?