Count the number of triangles in the below picture?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

Replace the question mark with the correct number in below Picture:

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Remove two matchsticks to make the below equation correct.

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

When it is alive we sing, when it is dead we clap our hands. What is it?

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?