The tranquillity and sanctity of the place soothed us. (synonym)

• Security
• Holiness
• Equanimity
• Placidity
Correct Option: B  [ Holiness ]

Remark:

He has been very feeble since his illness. (Synonym)

• Unwell
• Thin
• Weak
• Delicate
Correct Option: C  [ Weak ]

Remark:

For the first week, the apprentice felt like fish out of water.

• frustrated
• homeless
• disappointed
• uncomfortable
Correct Option: D  [ uncomfortable ]

Remark:

The horse and the coach ________ arrived.

• have
• have been
• would
• has
Correct Option: A  [ have ]

Remark: When two singular nouns joined by "and" refer to the same person or thing, the verb is singular.
But here article "the" used twice before each noun to indicate two different subjects, thus "have" used.

Throw a stone __________ the fierce dog.

• at
• upon
• on
• above
Correct Option: A  [ at ]

Remark:

It is ________ one-day cricket match.

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

Remark:

_______ Man is mortal.

• the
• an
• a
• no article
Correct Option: D  [ no article ]

Remark:

Had they not helped (A) / him with money (B) / he would not have attained this position (C) / No error (D). (find error)

• A
• B
• C
• D
Correct Option: D  [ No error ]

Remark:

His indolence is a great drawback _______ his success.

• for
• in
• about
• to
Correct Option: D  [ to ]

Remark:

After a prolonged suffering he passed away.

• went away
• left
• expired
• yielded
Correct Option: C  [ expired ]

Remark: "passed away": demise, die