Which country gets ill every time?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

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

What is the centre of gravity?

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?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?