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CBSE
Class 9
Science
Exploration
Journey Inside the Atom
Question Bank

What major concept did the dis...

Single Answer MCQ
Q-00172019

What major concept did the discovery of radiation challenge?

1

Atoms are the smallest units of matter

2

Matter is indivisible

3

Matter cannot be created or destroyed

4

Elements are pure substances

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Who proposed the idea of indivisible particles called 'parmanus'?

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Q2.

What was the term used by Democritus to refer to indivisible particles?

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Q3.

Which scientist's atomic theory was based on experimental observations?

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Q4.

What significant particle did J.J. Thomson discover?

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