Ashok as well his brothers _________ coming today.

• are
• were
• had been
• is
Correct Option: D  [ is ]

Remark:

Every girl and every boy ________ given a silver medal.

• are
• was
• has
• have
Correct Option: B  [ was ]

Remark: If a subject is modified by the words "each" or "every" that subject is singular and will take a singular verb.

One of the boys ________ been given a book.

• have
• are
• has
• were
Correct Option: C  [ has ]

Remark: "One of" is followed by "plural noun/pronoun" and "singular helping verb"

Each of the students _______ given a task to complete.

• were
• was
• have
• have been
Correct Option: B  [ was ]

Remark: If a subject is modified by the words "each" or "every" that subject is singular and will take a singular verb.

The Moon _______ around the Earth

• move
• moving
• moved
• moves
Correct Option: D  [ moves ]

Remark: Subject is "Moon" a Singular noun, go with singular verb.
When universal truths are mentioned, the verb used should be the simple present tense.

The public _______ the thief red-handed.

• catch
• caught
• is caught
• catching
Correct Option: B  [ caught ]

Remark:

Sir, our list of grievances here ________ a long one.

• are
• were
• is
• was
Correct Option: C  [ is ]

Remark: "list" is a singular noun, and when referring to a singular entity, the verb should also be singular.

Neither John nor Alex __________ scored the century.

• have
• was
• has
• is
Correct Option: C  [ has ]

Remark: in case "Neither-Nor" the verb must agree with the second subject (the subject closer to the verb).

Our Principal and Chairman of the occasion ________ arrived.

• is
• has
• have
• are
Correct Option: B  [ has ]

Remark:

This magazine _________ twice weekly.

• is appearing
• appearing
• appears
• appeared
Correct Option: C  [ appears ]

Remark: Subject is "Magazine" a Singular noun, go with singular verb.