Directions: The given sentence has been broken up into four different parts. The error, if any, will be in any one part of the sentence. Select the option which contains the part of the sentence which has an error (spelling, grammatical or contextual). If there is no error, choose option E.
1
The RBI rules led to an aggressively (A) / lobbying effort  from the United States government and American companies (B) / who said the directive would increase infrastructure costs (C) / and hurt firms’ investment plans. (D) / No error (E)
» Explain it
A
The error is in fragment A. The adjective form of the noun ‘aggression’ should be used here. 
 
So the adjective ‘aggressive’ should be used instead of the adverb ‘aggressively’ in order to make the sentence correct.  
 
The correct sentence would therefore be:
 
The RBI rules led to an aggressive lobbying effort from the United States government and American companies who said the directive would increase infrastructure costs and hurt firms’ investment plans.
 
Hence, option A is the correct answer.
2
The index is a useful tool as it helps identify (A) / the problems as well as the success stories (B) / and provides an opportunity for states to learn (C) / from each other’s successes as well as failures. (D) / No error (E)
» Explain it
D
The error is in fragment D. The reciprocal pronouns ‘each other’ is used when we refer to two entities and ‘one another’ is used when referring to more than two. 
 
Here ‘one another’ should be used instead of ‘each other’ in order to make the sentence correct.  
 
The correct sentence would therefore be:
 
The index is a useful tool as it helps identify the problems as well as the success stories and provides an opportunity for states to learn from one another’s successes as well as failures.
 
Hence, option D is the correct answer.
3
Demand usual picks up (A) / in the second half of (B) / the year due to (C) / the wedding season. (D) / No error (E)
» Explain it
B
The error is in fragment A. The adverb form of the word ‘usual’ should be used as it qualifies the verb ‘picks up’. So ‘usually’ should be used instead of ‘usual’ in order to make the sentence correct.  
 
The correct sentence would therefore be:
 
Demand usually picks up in the second half of the year due to the wedding season.
 
Hence, option B is the correct answer.
4
Even India is (A) / feeling the pinches (B) / and it has increasingly (C) / weighed on business confidence. (D) / No error (E)
» Explain it
B
The correct idiomatic expression is 'feeling the pinch' and not 'feeling the pinches'. The error hence is in fragment B.
 
Feel the pinch (Idiom):
 
To have problems with money because you are earning less than before
 
E.g. When my father lost his job and we had to live on my mother's earnings, we really started to feel the pinch.
 
The correct sentence would therefore be:
 
Even India is feeling the pinch and it has increasingly weighed on business confidence.
 
Hence, option B is the correct answer.
5
While the tooth fairy continues to lag ahead (A) / tech developments, there are already piggy bank apps, (B) / ones for pocket money with contactless cards, and (C) / schools use cashless payment systems for lunches and trips. (D) / No error (E)
» Explain it
A
The fragment A of the sentence is erroneous. The expression 'lag ahead' is absurd.
 
The correct phrasal verb is 'lag behind' which means ‘to move at a slower pace than someone or something’ 
 
The correct sentence would be:
 
While the tooth fairy continues to lag behind tech developments, there are already piggy bank apps, ones for pocket money with contactless cards, and schools use cashless payment systems for lunches and trips
 
Hence, option A the correct answer.