Read the following given passage carefully and choose the best answer to each question out of the four alternatives and appropriate in the answer sheet.

Suppose your son misbehaves towards you, or your father one day in his anger is unduly severe to you, it is not great virtue to forgive them. Suppose a brother of yours does you some harm and you say. “Never mind, you are my brother, I let you go,” there is no great virtue in that. The difficulty is when you have to forget the sin of your enemies. It your Dayady who has always hated you, does you some fresh injury and you forgive that, then it is a real act of forgiveness.
It is that which the Mahatma preaches. He says, “Forgive thine enemies,” which is one of the teachings of Jesus Christ. It is a mistake to think Christianity alone preaches the virtue. Other religions also teach it. Now Gandhi is pre-eminently a Hindu, and he says he is living the best part of Hinduism when he himself forgives the sin of enemies, and asks people to love them as their friends.

What virtue of Gandhiji is the author talking about?

Fear : Threat :: Anger:?

Four of the following five are alike in a certain way so form a group. Which is the one that does not belong to that group? 

If the circumference of a circle increases from 4π to 8π, what change occurs in its area?

Which number come at the Question mark(?)
6 : 48 : 8 : ?

Which continent is called the 'birthplace of mankind'.