I have eight fingers and two thumbs but I do not live. What Am I?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

What do you think with the below Picture ?

Can you find the key in the picture below?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

What have one eye but still cannot see?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

I have Rs.50 and I spend it in the way as below.