Chapter Exam

Chapter 13: Atoms — Online MCQ Test

Q: Who proposed the nuclear model of the atom based on the alpha particle scattering experiment?

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.

Q: In Rutherford's alpha particle scattering experiment, most of the alpha particles passed through the gold foil without deflection because the atom is mostly:

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.

Q: The wavelength of radiation emitted when an electron in hydrogen falls from n = 3 to n = 2 belongs to which 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.

Q: The first line of the Balmer series in hydrogen corresponds to the transition:

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.

PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Chapter 13: Atoms with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS. 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.

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Chapter 13: Atoms — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS — Chapter 13: Atoms, with answers and explanations. These are sample questions; the exam has its own separate question set.

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.

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.

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.

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.

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.