Verbal Reasoning - Mental Ability Questions

While introducing a boy, Raju says, "He is the son of my wife's sister." How is the boy related to Raju?

Select the related word/letters/number from the given alternatives. E : V : : D : ?

In the following question, select the related word pair from the given alternatives.

Power : Watt : : ? : ?

If 40@8 = -5, 30@3 = -10 and 20@5 = -4, then find the value of 60@3 = ?

Select the missing number from the given responses:

In the following question, select the missing number from the given series.
1, 3, 6, 10, 15, ?

In a row of boys, Amit is ranked 12th from top and Ratan is 15th from bottom. They interchange their position. Ratan now becomes 37th from bottom. How many total boys are there in the row?

Deepak introduces Raju saying, "He is the husband of the granddaughter of the father of my father." How is Raju related to Deepak?