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Indian Navy AA (Artificer Apprentice) Science — practice by topic

Browse 26 questions across 10 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)The Human Eye and the Colourful World (4)Chemical Reactions and Equations (3)Carbon and its Compounds (2)Electricity (2)Light - Reflection and Refraction (2)Metals & Non-metals (2)C10humaneye (1)Chemistry (1)Metals and Non-metals (1)

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Which acid generally does NOT give hydrogen gas on reacting with metals (except Mn, Mg)?Read the answer and worked solution →In the reactivity series, which metal would be displaced from its salt solution by all of Fe, Zn and Al?Read the answer and worked solution →In a series circuit, the electric current through each component is:Read the answer and worked solution →A reaction of the type AB → A + B, where a single compound breaks into simpler substances, is a:Read the answer and worked solution →

Worked practice questions

Which acid generally does NOT give hydrogen gas on reacting with metals (except Mn, Mg)?

  1. hydrochloric acid
  2. sulphuric acid (dilute)
  3. acetic acid
  4. nitric acid (HNO₃)
Show answer and solution

Correct answer: D. nitric acid (HNO₃)

HNO₃ is a strong oxidiser it oxidises the H₂ produced to water, so metals (except Mn, Mg with very dilute HNO₃) give oxides/nitrogen oxides instead of H₂.

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In the reactivity series, which metal would be displaced from its salt solution by all of Fe, Zn and Al?

  1. copper
  2. potassium
  3. magnesium
  4. calcium
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Correct answer: A. copper

A metal is displaced by metals above it in the reactivity series. Cu is below Fe, Zn and Al, so all three can displace copper from CuSO₄. Mg, Ca, K are all above them.

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In a series circuit, the electric current through each component is:

  1. always zero
  2. the same
  3. doubled at each component
  4. different for each
Show answer and solution

Correct answer: B. the same

In series, the same current flows through every component.

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