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Which of the following is/are the ultra-tough ceramics that could be used in diesel engines?

Which of the following is/are the ultra-tough ceramics that could be used in diesel engines? Correct Answer Silicon carbide, alumina, and zirconia

Much research is ongoing to produce ultra-tough ceramics such as silicon carbide, silicon nitride, alumina, and zirconia. This research aims to reduce the brittleness such that these materials could be used in diesel engines and gas turbines.

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Directions : Following question consists of a statement followed by three arguments I, II and III . You have to decide which of the arguments is a STRONG arguments and which is a WEAK Argument.

Statement : Should coal engines be replaced by electric engines in trains?

Arguments :
I. Yes. Coal engines cause a lot of pollution.
II. Yes. Electric engines are good on performance, easy to operate and low on maintenance.
III. No. India does not produce enough electricity to fulfil its domestic needs also.
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