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Indian Navy SSR Science — practice by topic

Browse 29 questions across 13 Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Science topics

Science & Technology (8)Chemical Reactions and Equations (3)Electricity (3)Light - Reflection and Refraction (3)Acids, Bases and Salts (2)Acids Bases Salts (2)Carbon and its Compounds (2)Metals and Non-metals (2)Metals & Non-metals (2)Chemistry (1)Class10 Chem Reaction Types (1)Physics (1)The Human Eye and the Colourful World (1)

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On prolonged reaction of iron with steam, the oxide formed isRead the answer and worked solution →A non-metal that is lustrous isRead the answer and worked solution →A solution with a pH less than 7 is:Read the answer and worked solution →An ammeter, used to measure current, is always connected in the circuit in:Read the answer and worked solution →

Worked practice questions

On prolonged reaction of iron with steam, the oxide formed is

  1. Fe(OH)₃
  2. Fe₂O₃
  3. FeO
  4. Fe₃O₄
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Correct answer: D. Fe₃O₄

$3Fe + 4H_2O \xrightarrow{steam} Fe_3O_4 + 4H_2$. Magnetic iron oxide (Fe₃O₄) is produced, not the rust Fe₂O₃ (which needs moist air).

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A non-metal that is lustrous is

  1. sulphur
  2. phosphorus
  3. carbon (amorphous)
  4. iodine
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Correct answer: D. iodine

Iodine is a non-metal but has a shiny, metallic-grey lustre — a notable exception. (Graphite is also lustrous, but iodine is the classic example.)

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A solution with a pH less than 7 is:

  1. acidic
  2. neutral
  3. basic
  4. always pure water
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Correct answer: A. acidic

pH below 7 means the solution is acidic.

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