In Class 12 Boards there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 12 Physics Chapter 12 Atoms Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 12 Physics Case Study Questions Atoms to know their preparation level.
Join our Telegram Channel, there you will get various e-books for CBSE 2024 Boards exams for Class 9th, 10th, 11th, and 12th.
In CBSE Class 12 Physics Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Atoms Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 12 Physics Chapter 12 Atoms
Case Study/Passage-Based Questions
Case Study 1: Read Bohr’s model explains the spectral lines of the hydrogen atomic emission spectrum. While the electron of the atom remains in the ground state, its energy is unchanged. When the atom absorbs one or more quanta of energy, the electrons move from the ground state orbit to an excited state orbit that is farther away.
The given figure shows an energy level diagram of the hydrogen atom. Several transitions are marked as I, II, III, and so on. The diagram is only indicative and not to scale
In which transition is a Balmer series photon absorbed?
(a) II (b) III
(c) IV (d) VI
Answer: (d) VI
The wavelength of the radiation involved in transition II is
(a) 291 nm (b) 364 nm
(c) 487 nm (d) 652 nm
Answer: (c) 487 nm
Which transition will occur when a hydrogen atom is irradiated with radiation of wavelength 1030 nm?
(a) I (b) II (c) IV (d) V
Answer:(d) V
Case Study/Passage-Based Questions
Case Study 2:Hydrogen spectrum consists of discrete bright lines in a dark background and it is specifically known as hydrogen emission spectrum. There is one more type of hydrogen spectrum that exists where we get dark lines on the bright background, it is known as absorption spectrum. Balmer found an empirical formula by the observation of a small part of this spectrum and it is represented by
For the Lyman series, the emission is from the first state to the nth state, for the Paschen series, it is from the third state to the nth state, for the Brackett series, it is from the fourth state to the nth state, and for the Pfund series, it is from the fifth state to nth state
The number of spectral lines in a hydrogen atom is
(a) 8 (b) 6 (c) 15 (d) ∞
Answer: (d) ∞
Which series of hydrogen spectrum corresponds to the ultraviolet region?
(a) Balmer series (b) Brackett series
(c) Paschen series (d) Lyman series
Answer: (d) Lyman series
Which of the following lines of the H-atom spectrum belongs to the Balmer series?
(a) 1025 Å (b) 1218 Å
(c) 4861 Å (d) 18751 Å
Answer: (c) 4861 Å
Rydberg constant is
(a) a universal constant
(b) same for same elements
(c) different for different elements
(d) none of these
Answer: (a) a universal constant
Case Study 3: In Chapter 12, Atoms, we explored the atomic model, focusing on the quantum mechanical model of the atom. Rutherford’s nuclear model was a significant breakthrough, suggesting that an atom comprises a tiny, dense nucleus surrounded by electrons moving in orbits. However, this model could not satisfactorily explain atomic stability and the nature of spectral lines. To resolve these issues, Niels Bohr proposed an atomic model where electrons move in fixed orbits without radiating energy, and radiation occurs only when an electron transitions between these fixed orbits. He also proposed that the angular momentum of an electron in a fixed orbit is quantized, which means it can have only certain discrete values. This model provided an explanation for the atomic stability and the production of specific spectral lines.
What did Rutherford’s nuclear model suggest about the structure of an atom?
A) An atom consists of a tiny, dense nucleus surrounded by electrons moving in orbits.
B) An atom consists of a large, dense nucleus with stationary electrons.
C) An atom consists of a tiny, sparse nucleus with electrons moving in straight lines.
D) An atom is a solid sphere of uniform density.
What does Bohr’s atomic model propose about the movement of electrons?
A) Electrons move randomly around the nucleus.
B) Electrons move in fixed orbits without radiating energy.
C) Electrons move in orbits while continuously radiating energy.
D) Electrons are stationary and do not orbit the nucleus.
According to Bohr’s model, when does radiation occur?
A) When an electron is stationary in its orbit.
B) When an electron moves within the same orbit.
C) When an electron transitions between fixed orbits.
D) Radiation does not occur in Bohr’s model.
What did Bohr propose about the angular momentum of an electron in a fixed orbit?
A) It is constant.
B) It is zero.
C) It is quantized.
D) It is infinite.
What did Bohr’s model provide an explanation for?
A) The photoelectric effect.
B) The wave-particle duality of light.
C) The atomic stability and the production of specific spectral lines.
D) The uncertainty principle.
Answers:
- A) An atom consists of a tiny, dense nucleus surrounded by electrons moving in orbits.
- B) Electrons move in fixed orbits without radiating energy.
- C) When an electron transitions between fixed orbits.
- C) It is quantized.
- C) The atomic stability and the production of specific spectral lines.
Hope the information shed above regarding Case Study and Passage Based Questions for Class 12 Physics Chapter 12 Atoms with Answers Pdf free download has been useful to an extent. If you have any other queries about the CBSE Class 12 Physics Atoms Case Study and Passage-Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible.
By Team Study Rate
