300+ TOP MCQs on Atoms and Nuclei and Answers

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. Here, you will discover the NEET Physics MCQs and Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Atoms and Nuclei Multiple Choice Questions make you feel confident in answering the question in the

MCQs on Atoms and Nuclei :

1. Which of the following should we consider to explain the fine structure of the spectrum of hydrogen?
(A) The presence of neutrons in the nucleus
(B) Orbital Angular Momentum
(C) Infinite size of the nucleus
(D) Spin angular Momentum

Answer

Answer: (D) Spin Angular Momentum

2. Which of the following statements is true about Bohr’s atomic model?
(A) The electron can only move in particular orbits only
(B) An electron radiates energy only when it jumps to another orbit
(C) An atom consists of a positively charged nucleus
(D) All of the above

Answer

Answer: (D) All of the above

3. If the radius of Bohr’s first orbit is a0, what is the radius of the nth orbit?
(A) na0
(B) a0/n
(C) n2a0
(D) a0/n2

Answer

Answer: (C) n2a0

4. Of the various series of the hydrogen spectrum, which of the following lies wholly in the ultraviolet region?
(A) Balmer Series
(B) Paschen Series
(C) Brackett series
(D) Lyman Series

Answer

Answer: (D) Lyman Series

5. In Bohr’s model, if the radius of the first orbit is r0, what is the radius of the third orbit?
(A) 3r0
(B) 9r0
(C) r0/9
(D) r0

Answer

Answer: (B) 9r0

6. What is the energy needed to ionize H-atom from its second excited state if the energy of the ground state of H-atom is 13.6 eV?
(A) 3.4 eV
(B) 1.51 eV
(C) 12.1 eV
(D) 13.6 eV

Answer

Answer: (B) 1.51 eV

7. Which of the following regions does X-ray lie between?
(A) visible and ultraviolet regions
(B) short radio waves and long radio waves
(C) short radio waves and visible region
(D) gamma rays and ultraviolet region

Answer

Answer: (D) gamma rays and ultraviolet region

8. Which of the following is a correct statement?
(A) Equal fractions disintegrate in equal intervals of time.
(B) The rate of disintegration is directly proportional to the number of atoms present in the sample at that instant.
(C) A radioactive sample takes an infinite time to disintegrate completely
(D) All of the above

Answer

Answer: (D) All of the above

9. Which of the following is true about gamma rays?
(A) Gamma rays are uncharged high energy rays coming from the outer space
(B) Gamma rays are high energy rays emitted by radioactive elements
(C) Gamma rays are charged particles emitted by radioactive elements
(D) Gamma rays are charged high energy rays coming from the outer space

Answer

Answer: (B) Gamma rays are high energy rays emitted by radioactive elements

10. How many numbers of spectral lines are observed when hydrogen atoms are excited from ground state to the state of principal quantum number 4?
(A) 2
(B) 3
(C) 5
(D) 6

Answer

Answer: (D) 6

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