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NCERT Class 9 Science Chapter 4 Atom Structure Quiz

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Questions and Answers

What led to the discovery of the positively charged sub-atomic particle called proton?

Electron bombardment
X-ray diffraction
Canal rays (correct)
Alpha particle emission

What is the focus of NCERT Class 9 Science Chapter 4?

Structure of the Atom (correct)
Human anatomy
Chemical reactions
Plant biology

What is the electrical charge of an atom containing one electron and one proton?

Variable
Neutral (correct)
Positive
Negative

What type of radiations are canal rays?

<p>Positively charged (A)</p> Signup and view all the answers

What does the discovery of canal rays contribute to in atomic theory?

<p>Discovery of protons (C)</p> Signup and view all the answers

Flashcards

Protons

Positively charged particles found in the atom's nucleus. They are discovered through the observation of canal rays.

Canal Rays

Streams of positively charged particles that travel in the opposite direction of cathode rays in a discharge tube.

Neutral Atom

The state of having no net electrical charge. An atom with equal numbers of protons and electrons is neutral.

Atomic Structure

The fundamental building blocks of matter, consisting of a nucleus containing protons and neutrons, surrounded by a cloud of negatively charged electrons.

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Atomic Theory

The study of the composition, structure, and properties of matter. It explores the fundamental building blocks of the universe.