Journey Inside the Atom
CBSE · Class 9 · Science
Most important questions from Journey Inside the Atom for CBSE Class 9 Science board exam 2026. MCQs, short answer, and long answer questions with marks.
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What was Dalton's atomic theory known for in the history of science?
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The first scientific description of how matter is made
Dalton's atomic theory was the first scientific description of how matter is made.
Which scientist discovered the electron in 1897?
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J. J. Thomson
J. J. Thomson discovered the electron in 1897 using cathode ray tube experiments.
J. J. Thomson discovered the electron using which experiment setup?
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Cathode ray tube experiments
Thomson used cathode ray tube experiments to study electric discharge in gases.
What did Thomson conclude about cathode rays?
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They are streams of negatively charged particles
Thomson found that cathode rays were streams of negatively charged particles, later called electrons.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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