Nelson was __________ boy without fear.

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

Remark: Using "a" suggests that Nelson was just one of many boys without fear.

My mother is allergic to _______ cigarette smoke.

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

Remark:

Switzerland is ________ European country

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

Remark:

Let's watch _______ movie; I mean 'Pather Panchali'.

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

Remark: "The" used as movie name is specified.(the definite article)

_________ Indians sent a space craft to the Mars.

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

Remark: