Directions (21 to 25): Each sentence below is divided into five parts (I), (II), (III), (IV) and (V). Read each sentence to find out whether there is any grammatical mistake(s) in it. The error, if any, will be in one or more parts of the sentence. As your answer, select the CORRECT parts WITHOUT THE ERROR(S).
You may not know this (I)/ but this engine is (II)/ claimed to have twice as powerful (III)/ as the previous one (IV)/ was being built by NASA. (V)
Solution
III is wrong. In place of ‘claimed to have twice as powerful’, we should use ‘claimed to BE twice as powerful’ or ‘claimed to have twice as MUCH POWER’. V is wrong because and in place of ‘was being built by NASA’, it should be ‘built by NASA’.