I see him once in a blue moon.

• regularly
• seldom
• very often
• casually
Correct Option: B  [ seldom ]

Remark: "once in a blue moon": not very often

Elastic(Find Synonym)

• Free
• Liberal
• Flexible
• Broad
Correct Option: C  [ Flexible ]

Remark:

Thick mist hung ............... the forest.

• over
• on
• around
• about
Correct Option: A  [ over ]

Remark:

That cannot be altered or withdrawn

• irrevocable
• irretrievable
• irresistible
• arrears
Correct Option: A  [ irrevocable ]

Remark:

He has a very unique scene in this cinema. (Antonym)

• rare
• uncommon
• matchless
• common
Correct Option: D  [ common ]

Remark:

The village possesses _______ scenic beauty.

• some
• a
• an
• the
Correct Option: D  [ the ]

Remark:

This is __________ one-man show.

• a
• an
• the
• zero article
Correct Option: A  [ a ]

Remark:

Srilanka is ________ island.

• a
• an
• the
• zero articles
Correct Option: B  [ an ]

Remark:

He resembles ________ his brother.

• with
• to
• like
• None of the above
Correct Option: D  [ None of the above ]

Remark: the verb "resemble" is not typically followed by a preposition. It is usually used without a preposition.
Some verbs that are not generally followed by preposition are consider, discuss, influence, emphasize, resemble, inform, return, etc.

Either of the roads(A)/ lead(B)/ to the park(C)/ No error(D)

• A
• B
• C
• D
Correct Option: B  [ B ]

Remark: Use 'leads' instead of 'lead'