Journey Inside the Atom
CBSE · Class 9 · Science
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Who first proposed the idea of indivisible particles called parmanus in ancient India?
The Greek philosophers Leucippus and Democritus used which name for indivisible particles?
Which statement correctly describes the nature of the ancient idea of the atom?
In which year did John Dalton propose his atomic theory?
Sample Questions
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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