What do you answer even though it never asks you questions?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

When we see 2 but call 10?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

How many sides does a circle have?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

There is a dressing drawer which contains the following coloured socks in pairs: Purple, Magenta, Crimson, White, Yellow and Turquoise. Now, the socks are paired and each pair is together in the matching set. There is no light in the room and you open the drawer and pick up a pair. Then, without noticing any colour, you keep them back and pick them up again.

Can you calculate the probability that the pair of socks was Yellow both times?

Can you find the key in the picture below?