Copper is __________ Useful metal. (appropriate article)

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

Remark: "a" is correct because "useful" starts with a consonant sound. "An" is used before words that start with vowel sounds.

It was ________ unit of measurement.

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

Remark:

London is on _________ Thames..

• An
• A
• The
• No article is needed
Correct Option: C  [ The ]

Remark:

Srilanka is ________ island.

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

Remark:

It is _______ unjust charge.

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

Remark:

The work took half _______ hour.

• a
• an
• the
• none
Correct Option: B  [ an ]

Remark:

Switzerland is ________ European country

• an
• a
• the
• No article is needed
Correct Option: B  [ a ]

Remark:

Here are ________ dozen of bananas.

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

Remark:

_______ Man is mortal.

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

Remark:

Give me __________ one-rupee note.

• an
• a
• the
• none of these
Correct Option: B  [ a ]

Remark: "a" is an indefinite article. It is used before a singular countable noun to refer to any one item of that kind.