Chapter 13: Atoms — Online MCQ Test
PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Chapter 13: Atoms with a free chapter-wise online MCQ test.
This chapter covers: Focusing on atomic models this chapter covers Alpha particle scattering experiment Rutherford atomic model Bohr atom model energy levels and hydrogen spectrum series..
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 13: Atoms — Important Questions & Answers
Who proposed the nuclear model of the atom based on the alpha particle scattering experiment?
- A. J. J. Thomson
- B. Ernest Rutherford
- C. Niels Bohr
- D. James Chadwick
Answer: B. Ernest Rutherford
Rutherford proposed the nuclear model after analyzing the alpha particle scattering results. It showed that most of the atom is empty space with a tiny, dense nucleus.
Rutherford proposed the nuclear model after analyzing the alpha particle scattering results. It showed that most of the atom is empty space with a tiny, dense nucleus.
In Rutherford's alpha particle scattering experiment, most of the alpha particles passed through the gold foil without deflection because the atom is mostly:
- A. solid and dense
- B. filled with electrons only
- C. empty space
- D. made of neutrons
Answer: C. empty space
Most alpha particles passed straight through because the atom has a very small nucleus and is mostly empty space. Only a few particles were deflected by the nucleus.
Most alpha particles passed straight through because the atom has a very small nucleus and is mostly empty space. Only a few particles were deflected by the nucleus.
Which observation from Rutherford's experiment led to the conclusion that the nucleus is very small and positively charged?
- A. Most alpha particles were absorbed by the foil
- B. A few alpha particles were deflected through large angles
- C. All alpha particles moved in curved paths
- D. No alpha particles passed through the foil
Answer: B. A few alpha particles were deflected through large angles
Large-angle deflections of a few alpha particles indicated a concentrated positive charge in a tiny region. This region was identified as the nucleus.
Large-angle deflections of a few alpha particles indicated a concentrated positive charge in a tiny region. This region was identified as the nucleus.
The wavelength of radiation emitted when an electron in hydrogen falls from n = 3 to n = 2 belongs to which series?
- A. Lyman series
- B. Balmer series
- C. Paschen series
- D. Brackett series
Answer: B. Balmer series
Any transition ending at n = 2 belongs to the Balmer series. The n = 3 to n = 2 transition is the H-alpha line in the visible region.
Any transition ending at n = 2 belongs to the Balmer series. The n = 3 to n = 2 transition is the H-alpha line in the visible region.
The first line of the Balmer series in hydrogen corresponds to the transition:
- A. n = 2 to n = 1
- B. n = 3 to n = 2
- C. n = 4 to n = 2
- D. n = 5 to n = 2
Answer: B. n = 3 to n = 2
The first Balmer line is produced by the transition from n = 3 to n = 2. This is the H-alpha line in the visible spectrum.
The first Balmer line is produced by the transition from n = 3 to n = 2. This is the H-alpha line in the visible spectrum.