Atoms Practice Questions
Class 12 · Physics · 2458 free MCQs with instant results and detailed explanations.
2458
Total
825
Easy
1194
Medium
439
Hard
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Topics in Atoms
Bohr Model
772
Hydrogen Spectrum
738
Rutherford Model
948
Sample Questions from Atoms
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What did Rutherford conclude about the structure of the atom from his gold foil experiment?
A.
Atoms are mostly empty space
B.
Atoms are solid
C.
Atoms contain no charge
D.
Atoms are indivisible
Show Answer & Explanation
Correct Answer: A
Rutherford found that most alpha particles passed through the foil, indicating that atoms are mostly empty space.
Q2
Easy
In Rutherford's model, what is the central part of the atom called?
A.
Electron cloud
B.
Nucleus
C.
Proton shell
D.
Neutron belt
Show Answer & Explanation
Correct Answer: B
The nucleus is the central part of an atom that contains protons and neutrons.
Q3
Easy
What particle did Rutherford discover in the nucleus of the atom?
A.
Neutron
B.
Proton
C.
Electron
D.
Positron
Show Answer & Explanation
Correct Answer: B
Rutherford's experiments led to the discovery of the proton as a constituent of the nucleus.
Q4
Medium
What was the key conclusion of Rutherford's gold foil experiment?
A.
Atoms have a small, dense nucleus.
B.
Atoms are indivisible.
C.
Electrons are scattered evenly.
D.
Atoms contain only protons.
Show Answer & Explanation
Correct Answer: A
The gold foil experiment showed that most alpha particles passed through the foil but some were deflected, leading to the conclusion that atoms have a small, dense nucleus.
Q5
Medium
In Rutherford’s model, what does the nucleus contain?
A.
Protons and electrons
B.
Neutrons only
C.
Protons and neutrons
D.
Only protons
Show Answer & Explanation
Correct Answer: C
The nucleus contains both protons and neutrons, which account for most of the atom's mass.
Q6
Medium
Which limitation is associated with the Rutherford model of the atom?
A.
Does not explain atomic spectra
B.
Does not consider electrons
C.
Nucleus is too large
D.
Ignores neutron existence
Show Answer & Explanation
Correct Answer: A
Rutherford's model could not explain the discrete lines in atomic spectra, leading to the development of quantum mechanics.
Q7
Medium
According to Rutherford’s model, the overall charge of the nucleus is?
A.
Neutral
B.
Positive
C.
Negative
D.
Variable
Show Answer & Explanation
Correct Answer: B
The nucleus is positively charged due to the presence of protons.
Q8
Hard
What was the main conclusion of Rutherford's gold foil experiment regarding atomic structure?
A.
Atoms are mostly empty space.
B.
Electrons are contained in fixed orbits.
C.
Positive charge is uniformly distributed.
D.
All atoms have the same size.
Show Answer & Explanation
Correct Answer: A
Rutherford concluded that atoms are mostly empty space due to the majority of alpha particles passing through the foil without deflection.
Q9
Hard
In the Rutherford model, what accounts for the stability of electrons in their orbits around the nucleus?
A.
Gravitational force.
B.
Electrostatic attraction.
C.
Magnetic force.
D.
Quantum mechanical principles.
Show Answer & Explanation
Correct Answer: B
The stability of electrons in the Rutherford model is due to the electrostatic attraction between the negatively charged electrons and the positively charged nucleus.
Q10
Hard
What critical flaw in Rutherford's model was later addressed by the Bohr model?
A.
The existence of electrons.
B.
The emission of radiation by electrons.
C.
The presence of a nucleus.
D.
The concept of isotopes.
Show Answer & Explanation
Correct Answer: B
Rutherford's model could not explain why electrons do not emit radiation while orbiting the nucleus, a flaw that was addressed by the Bohr model.
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Atoms — Class 12 Physics Practice Questions Online
This page contains 2458 practice MCQs for the chapter Atoms in Class 12 Physics. The questions are organized by difficulty — 825 easy, 1194 medium, 439 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.