Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Out of four images which one is the odd one out?

Can you replace the question mark with the correct number in the below table sequence?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?