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Important Questions

Structure of the Atom

Bihar Board · Class 9 · Science

Most important questions from Structure of the Atom for Bihar Board Class 9 Science board exam 2026. MCQs, short answer, and long answer questions with marks.

44 questions24 flashcards5 concepts

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An illustration of J.J. Thomson's atomic model, depicting an atom as a sphere of uniformly distributed positive charge with electrons (plums) embedded within it.
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44 Questions·
multiple choicemultiple correct

Sample Questions

1multiple correct

Which subatomic particles are present in the nucleus of an atom?

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Protons, Neutrons

The nucleus contains protons (positively charged) and neutrons (neutral). Electrons revolve around the nucleus in shells. Positrons are not found in normal atoms.

2multiple correct

What did Rutherford's gold foil experiment prove?

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Most of the atom is empty space, The nucleus is very small, All positive charge is concentrated in the nucleus

Rutherford's experiment showed that most alpha particles passed through (empty space), few were deflected (small nucleus), and very few bounced back (concentrated positive charge). This disproved Thomson's model and Dalton's indivisible atom theory.

3multiple choice

What is the atomic number of an element with 11 protons?

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11

Atomic number equals the number of protons in the nucleus. An element with 11 protons has atomic number 11 (which is sodium).

4multiple correct

Which of the following are isotopes of hydrogen?

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Protium, Deuterium, Tritium

Protium (¹₁H), Deuterium (²₁H), and Tritium (³₁H) are the three isotopes of hydrogen with mass numbers 1, 2, and 3 respectively. Helium is a different element.

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Frequently Asked Questions

What are the important topics in Structure of the Atom for Bihar Board Class 9 Science?
Structure of the Atom covers several key topics that are frequently asked in Bihar Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Structure of the Atom — Bihar Board Class 9 Science?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Structure of the Atom?
There are 44 practice questions available for Structure of the Atom. These cover multiple question types including MCQs, short answer, and long answer questions.

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