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Question

Identify the incorrect sentence.

This question was previously asked in
SSC CHSL 2025 Tier 1 Question Paper (21-Nov-2025) (Shift 1)
The correct answer is

The principles of science is difficult to understand.

The task is to find the sentence that breaks a grammar rule, and subject-verb agreement is the point being tested here.

The rule is that a verb must agree in number with its true subject, not with any noun that merely sits closest to it.

In 'The principles of science is difficult to understand', the head of the subject is the plural noun 'principles'; 'of science' is only a modifying phrase.

A plural subject requires the plural verb 'are', so the singular 'is' is wrong and creates the error; the attractive singular 'science' just before the verb misleads the ear.

The other three sentences agree correctly: 'Reactions... have', 'The author... is' (singular head 'author'), and 'Many lines... are' all match subject to verb.

Hence the grammatically incorrect sentence is The principles of science is difficult to understand.

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Important Questions from Error Spotting

  1. Direction: Each item in this section has a sentence with three underlined parts labelled (a), (b) and (c) Read each sentence to determine whether there is an error in any underlined part and indicate your response in the Answer Sheet against the corresponding letter, i.e., (a) or (b) or (c). If you find no error, your response should be indicated as (d).

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    A company of five thousand soldiers , (a) / having marched tirelessly for over five days , (b) /  have just moved into their cantonment . (c) / No error (d)
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    Every person who believes in principles (a) / must stand up to fight  (b) /  for their convictions . (c) / No error (d)
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