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Statement and Argument - Verbal and Reasoning

Directions to SolveEach question given below consists of a statement, followed by three or four arguments numbered I, II, III and IV. You have to decide which of the arguments is/are 'strong' arguments) and which is/are 'weak' arguments) and accordingly choose your answer from the alternatives given below each question.
Q1:

Statement: Should coal engines be replaced by electric engines in trains? Arguments:
  1. Yes. Coal engines cause a lot of pollution.
  2. Yes. Electric engines are good on performance, easy to operate and low on maintenance.
  3. No. India does not produce enough electricity to fulfil its domestic needs also.

A All are strong

B Only I and II are strong

C Only II and III are strong

D Only I and III are strong

E Only I is strong

ANS:B - Only I and II are strong

Explanation: Clearly, electric engines shall be smoke-free and thus not cause pollution as the coal engines. They also run at higher speeds and perform better. Thus, both I and II hold strong. Argument III does not provide a convincing reason and hence does not hold strong.