What word is represented by this rebus?

who is silent in the parliament?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

What goes up but never comes down?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Can you find the key in the picture below?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

What will you call your mother's brother's brother-in-law?