This is one of the most challenging questions in the entire paper.
No error. The superlative structure correctly uses the plural noun questions.
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The more he studied, the more difficult the subject seemed.
No error. The comparative-correlative structure is correctly formed.
The harder you practise, the more confident you become.
No error. The structure the + comparative..., the + comparative... expresses a proportional relationship.
The more carefully you read the question, the less mistakes you make.
Mistakes is plural and countable, so use fewer. Correct: The more carefully you read the question, the fewer mistakes you make.
This method is superior to the one used previously.
No error. Superior to is the correct expression.
She said that she would submit the report the following day.
No error. Would correctly expresses future time viewed from a past reporting point.
The officer said that the earth revolves around the Sun.
No error. A universal scientific fact may remain in the present tense in reported speech.
The train had left before we reached the platform.
No error. The past perfect correctly identifies the earlier event.
No sooner had the examination started than the electricity failed.
No error. No sooner...than is the correct pair.
He had hardly entered the room when the lights went out.
No error. Hardly...when is a correct correlative construction.
The officer will contact you once the verification is complete.
No error. Once the verification is complete correctly uses the present tense to refer to a future condition.
As soon as the portal opens, candidates will be able to register.
No error. The present simple correctly appears in the future time clause.
By next December, she will complete five years of service.
No error. Will complete can correctly express reaching a five-year service milestone by the stated future deadline. Will have completed is also p…
The examination will have finished by the time you reach the centre.
No error. The future perfect correctly describes an action completed before a future reference point.
The laboratory has been closed since the beginning of September.
No error. The beginning of September is a starting point, so since is correct.
He has been working on this project since three months.
Use for with a duration and since with a starting point. Correct: He has been working on this project for three months.
The department issued the revised notification last Monday.
No error. The simple past is correct with the definite past-time expression last Monday.
By the time the officer arrived, the meeting had already begun.
No error. The past perfect correctly identifies the action completed before another past event.
The cattle is grazing near the river.
Cattle is a plural collective noun in standard English. Correct: The cattle are grazing near the river.
The police have arrested two suspects in connection with the theft.
No error. Police takes a plural verb when referring to police officers collectively.
The news about the examination has surprised everyone.
No error. News ends in -s but is grammatically singular.
Ten kilometres is a long distance to walk in this heat.
No error. A measurement treated as one amount takes a singular verb.
One of the candidates who have qualified for the interview is absent.
No error. Who have qualified refers to the plural noun candidates, while is absent agrees with one.
The principal, along with the teachers, has approved the proposal.
No error. Along with the teachers does not change the number of the main subject principal.