Select the related word/letters/number from the given alternatives.

Optimist : Happy : : Pessimist : ?

Directions: In each question of below are two / three statements followed by two conclusions numbered I  and II . You have to take the two / three given statements. to be true even if they seem to be at variance from commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.
Give answer
(1) If only conclusion I follows
(2) If only conclusion II follows
(3) If either conclusion I or conclusion II follows
(4) If neither conclusion I nor conclusion II follows
(5) If both conclusion I and conclusion II follow 

Statements:
No fern is a plant.
All roots are ferns.
Conclusions
I. No plant is a root.
II. All ferns are roots.

From the following options, select the word which cannot be formed using the letters of the given word.
ENCYCLOPEDIA 

If H₂O : Hydrogen, then KOH:____

Find the odd number in the following given alternatives.

Direction: Study the following information carefully and answer the given questions. Fourteen people are sitting in 2 rows, 7 in each. P, Q, R, S, T, U, and V in row 1 facing south and A, B, C, D, E, F, and G in row 2 facing north but not necessarily in the same order. People in both rows face each other.

U is sitting third from on of the extreme ends. Two persons are sitting between the one facing U and D. Three persons are sitting between the immediate neighbor of the one who is facing D and S. E is facing the immediate neighbor of S. A is sitting to the immediate right of E. P and Q does not sit at any of the ends. Two persons are sitting between the one who is facing the immediate neighbor of P and A. At least three persons are sitting between the one facing A and Q. B is facing the one who is sitting second to the left of Q. R is neither facing E nor B. C is sitting fourth to the left of G. V is sitting to second to the right of T.

How many people are sitting between S and P?

Select theoption that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.

13 : 195 :: 7 : 63 :: 18 : ?

Choose the Venn diagram that correctly represents the relationship between the squares below.
Color, red, yellow