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Important Questions for Class 12 Physics Chapter 12 Atoms - PDF Download

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The Atoms Class 12 important questions will be helpful for students in enhancing their score in their board exams. The only key to handle Physics topics is by regular practice and daily study routine. The Class 12 Physics Chapter 12 important questions are the best study material for students who are preparing for the board and other competitive exams. And Class 12 Physics chapter 12 extra questions will boost your confidence too. The Important Questions Class 12 Physics Chapter 12 PDF includes all the textbook questions with detailed answers in a brief way so that anyone can understand . In the given study material students are expected to learn how to attempt Class 12 Physics Chapter 12 important questions with better understanding.

In chapter 12 of class 12 physics, you will be studying advanced topics like atom models, Rutherford’s model, description of atomic structure, many more. Students who are preparing for their upcoming exam should work on their weaker section by practicing with these extraQuestions Class 12 Physics Chapter 12 PDF. Chapter 12 of class 12 physics questions are a bit tricky to overcome. Students must recognize their weakness and strengths from the given topic.

This Chapter 12 of class 12 physics covers most of the important concepts from modern physics. Students who are ambitious to qualify for the board exams with good grades must start their preparation with quality materials like  Important Questions Class 12 Physics Chapter 12 PDF available here.

Let us have a look into some important points before we start with Atoms Class 12 important questions.

  • Chapter 12 of class 12 will give you the idea of the atoms. It basically focused on the introduction part of modern physics which is the foundation for advanced topics.

  • In this chapter, we learn about what an atom is, so many theories.

  • We learn about different atomic models like the Rutherford model and many more.

  • The chapter is also given an overview into some classic theories like Dalton's atomic theory, Thomson’s atomic model that explains an atomic structure in comparison with the watermelon and pudding.

  • You must learn about the scattering of atoms with the help of Rutherford's scattering experiment which is a milestone in modern physics.

  • We got introduced to the hydrogen atom followed by an explanation of determining the radius of the atom, spectral lines, Rydberg constant, and so on.

  • The hydrogen atom was well explained by Bohr’s atomic model; he explained that the electron revolves around the nucleus in a fixed orbits known as the shells. This theory  was the biggest advancement in the explanation of an atom.

These are a few key points to be remembered while solving Class 12 Physics Chapter 12 important questions. Students are advised to start their preparation with reliable content which will save their time,enable them to score well and where they can work on themselves.

Important Topics & Sub-topics of Atoms Class 12 Physics

In Class 12 Physics, the topic of "Atoms" primarily falls under the subfield of "Modern Physics" and is an important part of the curriculum. Here are the important topics and sub-topics related to Atoms in Class 12 Physics

  • Electron Orbits

  • Atomic spectra

  • Bohr Model of Hydrogen atom

  • Line spectra of the Hydrogen atom

  • de-Broglie explanation of Bohr’s postulate

Class 12 Physics Chapter 12 Atoms Weightage

The weightage of Chapter 12, "Atoms," in the Class 12 Physics syllabus can vary from one education board to another and even between different exams. However, in many Indian education boards like CBSE, ICSE, or state boards, Chapter 12 "Atoms" is considered an important and moderately weighted chapter.

Typically, this chapter may have a weightage of around 10% to 15% of the total marks in the Class 12 Physics CBSE board examination. It's very important to check the specific curriculum and exam pattern provided by your education board or institution to get the most accurate information regarding the weightage of this chapter in your upcoming exams.

Tips to Solve Class 12 Physics Chapter 12 Atoms

Here are some tips to help you solve Class 12 Physics Chapter 12 on Atoms effectively:

Understand the Concepts: Start by thoroughly understanding the fundamental concepts of atomic structure, such as Bohr's model, quantum numbers, and the electronic configuration of atoms.

Read the Textbook: Go through your textbook carefully, paying close attention to explanations, diagrams, and examples provided.

Take Notes: As you read, take concise notes. Summarize key points and formulas for quick reference.

Practice Numerical Problems: Physics often involves solving numerical problems. Practice various types of numerical problems related to atomic structure to strengthen your problem-solving skills.

Use Online Resources: There are many online resources, including videos and interactive simulations, that can help you visualize atomic concepts and deepen your understanding.

Solve Previous Year Papers: Practicing previous year's question papers will give you an idea of the types of questions asked and help you become familiar with the exam pattern.

Seek Help: If you encounter difficulties, don't hesitate to seek help from your teacher, classmates, or online forums. Discussing concepts with others can provide valuable insights.

Create a Study Schedule: Plan a study schedule that allocates sufficient time for each topic within the chapter. Stick to this schedule to cover all the material.

Teach Someone Else: Teaching someone else what you've learned is an excellent way to consolidate your knowledge. You can teach a friend or family member or even explain concepts to yourself as if you're teaching.

Stay Calm and Confident: Maintain a positive attitude and stay confident in your ability to understand and solve problems related to atomic structure.

Remember that practice and understanding are key to mastering any physics chapter, including Chapter 12 on Atoms. Take your time to grasp the concepts, and don't hesitate to ask for help when needed. 

Benefits of Solving Class 12 Physics Chapter 12 Important Questions with Answers

Solving Class 12 Physics Chapter 12 important questions with answers can offer several benefits:

Concept Clarity: It helps reinforce your understanding of key physics concepts related to atoms, nuclei, and particles.

Exam Preparation: These questions are often aligned with the exam pattern, making them valuable for exam preparation.

Time Management: Practicing important questions can improve your time management skills by focusing on high-priority topics.

Self-Assessment: It allows you to assess your knowledge and identify areas where you need more practice.

Problem-Solving Skills: You develop problem-solving skills by tackling a variety of questions and learning different approaches.

Confidence Boost: Success in solving important questions can boost your confidence for the final exams.

Retention of Knowledge: Revisiting important concepts through these questions can help you retain the information better.

Remember, it's essential to understand the concepts behind the answers rather than just memorizing them for the best results.

Frequently Asked Questions 

Question 1: Explain Thomson's Model of an atom. 

Answer: According to Thomson’s Model of an atom, J.J: he said that an atom is a positively charged sphere in which electrons are embedded and it  is just like a plum pudding or a watermelon. By giving an example of a plum pudding, he said that the pudding is a positively charged sphere and the plums resemble the electrons. But this model was not able to explain the large-angle scattering of alpha particles and also, it could not explain the spectral series in the case of hydrogen. 

Question 2: Define the following term:

Excitation energy

Ionisation energy

Answer: Excitation energy – The energy which is required by the electron to jump from the ground state to any excited states is called as excitation energy. For hydrogen, the first excitation energy is approximately 10.2eV and the second excitation energy is apporx 12.09eV.

Ionisation energy –The energy which is required to take an electron completely out of the atom is known as ionisation energy. In other words, it is the energy used to take out the electron from its ground state to the outermost orbit. 


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