Grade-3 Higher Secondary

The grammatically correct construction is “there is no air”. “There is” is used to state the existence or absence of something. The Moon has an extremely tenuous exosphere rather than an Earth-like atmosphere.

“A filter placed in front of a camera lens…” forms the subject of the sentence. “Placed” is a past participle modifying “filter”, followed by the main verb “changes”.

“where engineers were educated” correctly completes the sentence. “Where” introduces a relative clause and normal statement word order is used, not question inversion.

Frugal means economical, while thrifty means economical in the use of money or resources. They are synonyms.

Secret and clandestine both refer to something concealed or kept from public knowledge. “Site” and “sight” are homophones, not synonyms.

Deride means to ridicule or mock. Therefore, Deride – Mock is the synonym pair.

In older legal and historical usage, citizen and subject can both denote a person owing allegiance to a state, although modern constitutional usage distinguishes the terms.

Scatter means to spread or disperse, while collect means to gather. They are antonyms.

Advance means to move forward, whereas retreat means to move back. They are antonyms.

Acquit means to declare someone not guilty, while convict means to find someone guilty. They are legal antonyms.

The idiom “to split hairs” means to argue about very small or insignificant distinctions. Hence, to argue about trifles is the best answer.

“Nail the lie to the counter” means to expose or refute a lie publicly. Therefore, to expose publicly is the closest option.

The idiom “to see red” means to become extremely angry or furious.

“To hit below the belt” means to use an unfair or unacceptable tactic against an opponent.

The idiom “to beat about the bush” means to avoid the main point and approach a matter in a roundabout manner.

The proverb means that a certain possession is preferable to a greater but uncertain possibility. Therefore, certainty is better than possibility.

The intended grammatical sequence is III, IV, II, I: “As soon as I opened the front door of my house then I smelled the gas.”

The error is in Part IV. “What they can do to reduce harmful pollution” is the preferred construction rather than “for reducing” in this sentence.

Tangible means real, concrete or capable of being perceived physically. Therefore, actual is the closest option.

Option A is grammatically correct. The plural relative pronoun “those” takes “have lost”, and “this unfortunate accident” is correctly singular.