Identify the incorrect sentence.
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.
Similar Questions
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Important Questions from Error Spotting
The following question has a sentence with three underlined parts labelled (a), (b) and (c). Read each sentence to find out whether there is any error in any underlined part and indicate your response against the corresponding letter i.e., (a) or (b) or (c). If you find no error, your response should be indicated as (d).
It is identification with the audience(a)that makes one come home from the play so much more(b)satisfied than one ever is after merely passive enjoyment of the show.(c) No error.(d)
The following question has a sentence with four parts labelled (a), (b), (c), and (d). Read each sentence to find out whether there is an error in any part and indicate your response against the corresponding letter i.e., (a) or (b) or (c). If you find no error, your response should be indicated as (d).
CV Raman was one of the greatest sons of India (a) who has earned everlasting fame (b) for scientific researches. (c) No error. (d)
The following question has a sentence with three underlined parts labelled (a), (b) and (c). Read each sentence to find out whether there is any error in any underlined part and indicate your response against the corresponding letter i.e., (a) or (b) or (c). If you find no error, your response should be indicated as (d).
This box(a)is heavy than(b) the other one.(c) No error. (d)
The following question has a sentence with three underlined parts labelled (a), (b) and (c). Read each sentence to find out whether there is any error in any underlined part and indicate your response against the corresponding letter i.e., (a) or (b) or (c). If you find no error, your response should be indicated as (d).
Thewriter does not have the freedom (a) to choose his own themes, (b) society thrusts them on him (c) No error. (d)
The following question has a sentence with three underlined parts labelled (a), (b) and (c). Read each sentence to find out whether there is an error in any underlined part and indicate your response against the corresponding letter i.e., (a) or (b) or (c). If you find no error, your response should be indicated as (d).
No one knows (a) why he did it, (b) or who was behind his doing it.(c) No error. (d)
