The correct answer is 'D' i.e. this part of the sentence has an error.

Key Points

• In the fourth part of the given sentence, the use of the indefinite article 'an' is incorrect.
• 'A' and 'an' are indefinite articles, which means that they refer to, or introduce, an unspecified noun.
  • We use 'a' before a consonant sound (here, general) and we use 'an' before a vowel sound.
• The definite article 'the' is used before singular and plural nouns when the noun is specific or particular.
• ''No article'' is used when we refer to general ideas, plurals, or uncountable nouns.
• Therefore, the indefinite article 'a' should be used in place of the indefinite article 'an'.

Hence, the correct answer is option 4.

Correct Sentence: The tactics in the war were the traditional nomad tactics of harassing the enemy on the march, constantly retreating before him, and avoiding a general engagement.

Additional Information

There are three articles: a, an, and the. Articles are used before nouns or noun equivalents and are a type of adjective.

The correct answer is 'C' i.e. this part of the sentence has an error.

Key Points

• In the third part of the given sentence, the plural form of the verb 'are' is incorrect.
• The subject 'concept' in the given sentence is a singular subject.
• We know that a singular subject always takes a singular verb.
• The singular form of the verb 'is' should be used with the singular subject 'concept'.
• Therefore, the singular form of the verb 'is' should be used in place of the plural form of the verb 'are'.

Hence, the correct answer is option 3.

Correct sentence: The concept of bears searching for food in campgrounds is very much like the popular cartoon show, Yogi Bear from the 1970s.

Additional Information

• Subjects and verbs must agree with one another in number (singular or plural).
• Thus, if a subject is singular, its verb must also be singular; if the subject is plural, its verb must also be plural.

The correct answer is 'D' i.e. this part of the sentence has an error.

Key Points

• In the given sentence, the words 'repeat' and 'again' are used are used side by side in part D, thus the sentence is corrupted by redundancy.
• The word 'repeat' means to occur again in the same way or form.
• The word 'again' is included in the meaning of 'repeat'.
• So, both 'repeat' and 'again' can’t be used in a single sentence.
• Therefore, we can say that using the word 'again' along with 'repeat' is redundant.

Hence, the only possible answer is option 4.

Correct Sentence: They might not write it down, but learned it by heart and had to repeat it just before baptism.

The correct answer is 'B' i.e. this part of the sentence has an error.

Key Points

• In the second part of the given sentence, the plural form of the verb 'require' is incorrect.
• The subject 'drilling' in the given sentence is a singular subject.
• We know that a singular subject always takes a singular verb.
• The singular form of the verb 'requires' should be used with the singular subject 'drilling'.
• Therefore, the singular form of the verb 'requires' should be used in place of the plural form of the verb 'require'.

Hence, the correct answer is option 2.

Correct sentence: The drilling of wells of large size requires the use of heavy tools and of very strong appliances generally.

Additional Information

• Subjects and verbs must agree with one another in number (singular or plural).
• Thus, if a subject is singular, its verb must also be singular; if the subject is plural, its verb must also be plural.

The correct answer is 'A' i.e. this part of the sentence has an error.

Key Points

• In the first part of the given sentence, the words 'true' and 'facts' are used side by side, thus the sentence is corrupted by redundancy.
• The word 'facts' means things that are proven to be true.
• The word 'true' is included in the meaning of 'facts'.
• So, both 'true' and 'facts' can’t be used in a single sentence.
• Therefore, we can say that using the word 'true' along with 'facts' is redundant.

Hence, the only possible answer is option 1.

Correct Sentence: The facts regarding the Yugoslav legions and the services rendered by Yugoslav deserters at Gorizia and in the Trentino were simply suppressed.

The correct answer is 'D' i.e. this part of the sentence has an error.

Key Points

• In the fourth part of the given sentence, the use of the preposition 'beside' is incorrect.
• The preposition 'beside' means ''close to'' or ''next to'' somebody or something.
  • Example: They sat down beside the fire.
• ​The given sentence is saying that a large local element is present in each mountain floras apart from the arctic.
• Therefore, the preposition 'besides' should be used in place of the preposition 'beside'.
• The preposition 'besides' means ''in addition to'' or ''apart from'' somebody or something.
  • Example: Besides milk and butter, we need some vegetables.

Hence, the correct answer is option 4.

Correct Sentence: A detailed examination of mountain floras shows that a large local element is present in each besides the arctic.

The correct answer is discovery.

Key Points

• The passage is about a 'life bearing boulder or a large rock'.
• Let us read the line from the given passage: "The accidental ____(1)____of marine organisms on a boulder on the sea floor beneath 900 metres (3,000ft) of Antarctic ice shelf has led scientists to rethink the limits of life on Earth."
• From the sentence mentioned above we can understand that the accidental finding of something on the sea floor has led the scientists to think again about the limits of life on Earth.
• Clearly, the scientist came across the 'boulder'.
• In option 3, 'discovery' refers to 'the process of discovering or finding out'.
• Thus, 'discovery' is the appropriate word for blank no. 1.

Additional Information

The meaning of the other given words:

• escapade: an act involving excitement or adventure
• insight: a deep understanding of something
• initiative: the power to take charge before others do
• chance: a possibility

The correct sentence will be: The accidental discovery of marine organisms on a boulder on the sea floor beneath 900 metres (3,000ft) of Antarctic ice shelf has led scientists to rethink the limits of life on Earth.

The correct answer is obtain.

Key Points

• The passage is about a 'life bearing boulder or a large rock'.
• Let us read the line from the given passage: "Researchers stumbled on the life-bearing rock after sinking a borehole through nearly a kilometre of the Filchner-Ronne ice shelf on the south-eastern Weddell Sea to ____(2)____ a sediment core from the seabed."
• The given sentence informs us the way the researchers found the rock.
• In order to achieve a sediment core from the seabed the researchers had to sink a borehole.
• In option 4, 'obtain' refers to 'to get or acquire something'.
• So, 'obtain' is the appropriate word for blank no 2.

Additional Information

The meaning of the other given words:

• prefer: to be more partial to
• trudge: to walk slowly and with heavy steps
• enable: to give the authority to do something

The correct sentence will be: "Researchers stumbled on the life-bearing rock after sinking a borehole through nearly a kilometre of the Filchner-Ronne ice shelf on the south-eastern Weddell Sea to obtain a sediment core from the seabed."

The correct answer is 'scuppered'.

Key Points

• The passage is about a 'life bearing boulder or a large rock'.
• Let us read the line from the given passage: "While the boulder ____(3)____ their chances of obtaining the core,"
• It is mentioned in the passage that the boulder was found accidentally and the researchers were trying to get something else(the core).
• So, we can infer from the sentence that the researchers came across the boulder instead of the core.
• In option 3, 'scuppered' refers to 'ruined or prevented from succeeding'.
• So, 'scuppered' is the appropriate for blank no 3.

Additional Information

The meaning of the other given words:

• raised: moved to a higher position
• left: went away from
• shifted: moved from one place to another
• promoted: gave publicity to 

The correct sentence will be: "While the boulder scuppered their chances of obtaining the core"

The correct answer is stuck.

Key Points

• The passage is about a 'life bearing boulder or a large rock'.
• Let us read the line from the given passage: "footage from a video camera sent down the hole captured the first images of organisms ____(4)____ to a rock far beneath an ice shelf."
• From the given sentence we can understand that the researchers had sent down a video camera in order to find the core and the images of the organisms on the boulder were captured.
• So, the organisms were found on the boulder.
• In option 2, 'stuck' refers to 'cling to something or be fixed or glued'.
• So, the word 'stuck' is appropriate for blank no 4.

Additional Information

The meaning of the other given words:

• stabbed: thrust a knife to wound or kill someone
• unbound: not bound or tied up
• knocked: to strike a surface noisily
• found: searched out

The correct sentence will be:"footage from a video camera sent down the hole captured the first images of organisms stuck to a rock far beneath an ice shelf."