Which letter-cluster will replace the question mark (?) to complete the given series?

RMTS, WGAK, BAHC, GUOU, ?

Select the option th at represents the correct order of the given words as they would appear in an English dictionary.
 1. Sourced
 2. Sorrow
 3. Soulful
 4. Soaking
 5. Somewhere 

Which letter-cluster will replace the question mark (?) to complete the given series?
 TBNF, CJUL, LRBR, UZIX, ?

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statements: 

No plate is a spoon.

Some plates are forks.

All forks are knives.

Conclusions: 

I. Some plates are knives is a possibility.

II. No spoon is a fork.

The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number pairs, EXCEPT one. Find that odd number pair.

Directions : In which answer figure is the question figure embedded?

Question figure.

Three of the following letter-clusters are alike in some manner and hence form a group. Which letter-cluster does not belong to that group?

Select the word pair that best represents a similar relationship to the one expressed in the given pair of words. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word)
Hibiscus : Flower