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Class X — Science

Chemical reactions, acids & bases, metals, carbon compounds, heredity, light, and electricity

Sample Practice Questions

  1. Acid rain is caused mainly by:

    • CO₂ and O₃
    • SO₂ and NOₓ emissions
    • NH₃ and CH₄
    • Only water vapour
    Show answer

    Answer: SO₂ and NOₓ emissions

  2. In the modern periodic table, elements in the same group have:

    • Same mass number
    • Same number of neutrons
    • Same number of valence electrons
    • Same atomic mass
    Show answer

    Answer: Same number of valence electrons

  3. Which metal is the best conductor of electricity?

    • Copper
    • Gold
    • Aluminium
    • Silver
    Show answer

    Answer: Silver

  4. Which part of the brain controls balance and coordination?

    • Cerebrum
    • Cerebellum
    • Medulla oblongata
    • Hypothalamus
    Show answer

    Answer: Cerebellum

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Practice Questions

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