He says he has invented a time machine, which is clearly a load of cobblers.

• Genuine
• Great
• Nonsense
• Significant
Correct Option: C  [ Nonsense ]

Remark: "A load of cobblers" is indeed an idiom, and it is commonly used to express that something is nonsense, untrue, or of poor quality.

Not only my parents but also I _______ regretting the change of school.

• are
• is
• am
• No option is appropriate
Correct Option: C  [ am ]

Remark: in case "Not only...but also" the verb should agree with the subject closest to the verb.

I _______ in Chennai for a week in 2020.

• have been working
• have worked
• working
• worked
Correct Option: D  [ worked ]

Remark:

The director congratulated Mr. Varma _______ his success.

• on
• for
• at
• about
Correct Option: A  [ on ]

Remark:

He received COMPLIMENT for his social work. (Synonym)

• praise
• criticism
• punishment
• insult
Correct Option: A  [ praise ]

Remark:

Everyone was greatly amused ________ her ignorance of simple facts of life.

• by
• on
• at
• with
Correct Option: C  [ at ]

Remark:

The modern student _________ the importance of physical exercise.

• understood
• understand
• have understand
• understands
Correct Option: D  [ understands ]

Remark: singular subject (i.e student) takes singular verb (i.e understands).
Note: generally verb ends with "s" is singular.

Young cow that has not yet had a calf. (one word substitution)

• Cowlet
• Ewe
• Heifer
• none of these
Correct Option: C  [ Heifer ]

Remark:

Ameliorate (find Antonym)

• Improve
• Depend
• Soften
• Worsen
Correct Option: D  [ Worsen ]

Remark:

He was in a brown study and did not seem to catch my point.

• in his study room
• absorbed in reading
• absent – minded
• in a state of shock
Correct Option: B  [ absorbed in reading ]

Remark: