Verbal Reasoning - Mental Ability Questions

Oxygen helps in burnings while carbon dioxide extinguished fires.

Hence, Oxygen : Burn :: Carbon dioxide : Extinguish.

Clothes are not washed properly in hard water because it does not form lather with soap. However, it is true that hard water contains many minerals. 

We know that, ALpha and Omega are the first and last lettrs of in the Greek alphabet. Hence, alpha is to omega as first is to last.

4 is father of 1 and grandfather of 6. So, 1 is father of 6. Thus, 4 and 1 are the two fathers.
3 is the sister of 6. So, 3 is the daughter of 1. Since there is only one mother, it is evident that 5 is the wife of 1 and hence the mother of  3 and 6. So, 2 is brother of 1. There are three brothers. So, 6 is the brother of 3. Hence, 2 and 1 are brothers. 6 is the brother of 3. So, three brothers are 1, 2, 6.

PSRQ --> {16, 19, 18, 17} - next 3 alphabets of "P" is written in reverse order
SVUT --> {19, 22, 21, 20} - next 3 alphabets of "S" is written in reverse order

MNPO --> {13, 14, 16, 15}

KNML --> {11, 14, 13, 12} - next 3 alphabets of "K" is written in reverse order

Except "MNPO", others are not in consecutive order.

Letters in the word                   Letters in the alphabet

CRE                                                  CDE

ATIVE                                               ABCDE

TIV                                                   TUV

Protagonist and heroine are synonums to each other. Similarly, clothing and jeans are synonyms to each other in the given options. 

Hence, Protagonist is to heroine as clothing is to jeans.

A is the son of B and D is the son of the sister of B. So, A is the cousin of D.