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Indian Navy INET Metals and Non-metals — practice questions

Explore 5 free Metals and Non-metals questions in Indian Navy INET Science. Open each question or exercise to read its content, reference answers and available explanation.

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Metals and Non-metals questions and exercises with answers

Showing questions 1–5 of 5.

The process of coating iron with a thin layer of zinc to prevent rusting is called:Read the answer and worked solution →The thermit reaction, used to join railway tracks, involves the reaction of iron(III) oxide with:Read the answer and worked solution →Which metal is liquid at room temperature?Read the answer and worked solution →Highly reactive metals like sodium and aluminium are extracted from their ores by:Read the answer and worked solution →Heating a sulfide ore strongly in excess air converts it to an oxide. This step is called:Read the answer and worked solution →

Worked practice questions

The process of coating iron with a thin layer of zinc to prevent rusting is called:

  1. alloying
  2. electroplating with tin
  3. annealing
  4. galvanisation
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Correct answer: D. galvanisation

Galvanisation coats iron with zinc, which corrodes preferentially and protects the iron.

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The thermit reaction, used to join railway tracks, involves the reaction of iron(III) oxide with:

  1. sodium
  2. zinc
  3. carbon
  4. aluminium
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Correct answer: D. aluminium

Thermit: Fe₂O₃ + 2Al → 2Fe + Al₂O₃, a highly exothermic displacement used to weld rails.

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Which metal is liquid at room temperature?

  1. gallium
  2. sodium
  3. lead
  4. mercury
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Correct answer: D. mercury

Mercury is the only metal that is liquid at room temperature. Gallium melts at body temperature; sodium and lead are solids.

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