NCERT Class 12 Physics Chapter 4 Atoms Test Mock Test
This free online test covers Chapter 4, Atoms, from the NCERT Class 12 Physics Part II textbook. The 28 questions are written directly from the chapter — definitions, processes, worked examples and the points the book italicises — so a score here tells you how much of the chapter actually stuck, not how well you guess. Each answer carries an explanation that says why the right option is right and why the other three fail, which is where most of the learning happens. Attempt it after your first read of the chapter, then again before the exam. There is no negative marking, and you can review the full solution the moment you submit.
Duration
28 mins
Questions
28 MCQs
Total Marks
28 pts
Negative
0 per wrong
Topics Covered in This Paper
Sample Questions
Q1.In Thomson's model of 1898, picturesquely called the plum pudding model, the atom is pictured as:
- APositive charge distributed uniformly throughout the volume of the atom with electrons embedded in it like seeds in a watermelon
- BElectrons uniformly distributed through the volume with a small positive nucleus at the centre
- CA tiny positively charged nucleus with electrons revolving around it at large distances
- DA cloud of electrons with no positive charge at all
Q2.Condensed matter and dense gases emit a continuous distribution of wavelengths, while rarefied gases excited in a glow tube emit only certain discrete wavelengths. The reason is that in a rarefied gas:
- AThe atoms are packed so closely that their oscillations are strongly coupled
- BThe average spacing between atoms is large, so the radiation comes from individual atoms rather than from interactions between them
- COnly the electrons and not the nuclei are able to oscillate
- DThe temperature is too low for a continuous spectrum to be produced
Q3.In the Geiger-Marsden experiment performed around 1911 at Rutherford's suggestion, the scattered alpha-particles were detected by:
- AA photographic plate developed after the entire run was complete
- BA gold leaf electroscope connected to the foil
- CA spectrometer that analysed the wavelengths of the scattered radiation
- DA rotatable zinc sulphide screen and microscope, on which each particle produced a brief flash or scintillation
Before you begin
The test will auto-submit when the timer runs out.
Each correct answer carries +1 marks.
Each wrong answer carries -0 marks.
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Disclaimer: The questions provided here are extracted and digitized from previous year papers using automated processes. They may contain typographical errors, formatting issues, or minor variations from the actual examination paper. While we have done our best to verify the accuracy of the official answer keys, discrepancies may occasionally exist. Please refer to the official commission website for the most authentic paper.
Timer starts immediately and keeps running even if you close the tab. Make sure you have 28 uninterrupted minutes.
FAQ
Frequently asked questions
Frequently Asked Questions
- How many questions are in the NCERT Class 12 Physics Chapter 4 Atoms Test mock test?
- This paper has 28 multiple-choice questions carrying 28 marks in total, to be attempted in 28 minutes.
- Is the NCERT Class 12 Physics Chapter 4 Atoms Test mock test free to attempt?
- Yes. You can attempt the full paper online for free on AI Test Planet, and see your score and correct answers immediately after submitting.
- Does this paper have negative marking?
- No, there is no negative marking on this paper, so an attempted guess costs you nothing.
- Are solutions and explanations available?
- Yes. After you submit, every question shows the correct answer with a step-by-step explanation, along with a topic-wise breakdown of your performance.