Grey spot of oat are due to A: Copper B: Iron C: Manganese D: Zinc

The most abundant element amongst the following as found in plants is A: Carbon B: Nitrogen C: Iron D: Manganese

HTLA steels are susceptible to reheat cracking because they are with a lot of (). A: carbides B: hydrogen C: sulphur D: manganese

What can we add to brass to improve machining: A: Tin B: Copper C: Lead D: Manganese E: Carbon nanotubes

Which of the following is the most abundant solid mineral in the seabed?( ) A: Manganese nodule B: Nickel ore C: Copper mine D: Cobalt ore