Why Aeroplane windows are round?

who is silent in the parliament?

Prove that the below maths equation is true.

8 + 8 = 91

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

You can see it everyday, But cannot touch it at will. What is it?

Can you find out the remainder when 3^300 is divided by 5?

When it's bad luck to meet a black cat?

What is the next number in this series?

4,12,84,3612....

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?