Are you an HSC candidate looking for the Cumilla Board 2025 Physics 2nd Paper MCQ Solution? Physics is often considered one of the most challenging subjects in the science group, and the 2nd paper—focusing on Thermodynamics, Modern Physics, and Electronics—requires deep conceptual clarity.
In this guide, we provide a comprehensive analysis of the 2025 Cumilla Board questions. This resource is designed to help students verify their answers, understand their mistakes, and prepare for upcoming university admission tests.
Quick Answer Key: Physics 2nd Paper (Set-D)
Below is the verified answer key for the multiple-choice section.
- Conductor (The material where valence and conduction bands overlap)
- 98000 (Voltage gain calculation)
- 0.04 mA (Base current value)
- 120 J (Work done by the refrigerator)
- Dimensional formula for Entropy
- Efficiency less than one (Second Law of Thermodynamics)
- Velocity of electron formula selection
- All of the above (Related to photoelectric effect)
- Surface charge density unit
- Diamond (Critical angle context)
- Isotone (Same number of neutrons)
- Max Planck (Quantum theory originator)
- Statements i and ii (Mass-energy equivalence)
- Phase difference of pi
- 86.6 percent (Length contraction at high velocity)
- High resistance and low melting point (Fuse wire characteristics)
- 180 Ohms (Resistance after stretching the wire)
- All of the above (Electric intensity properties)
- 6 times (Mass increase in relativity)
- All of the above (Logic gate characteristics)
- Work done in a variable force field
- 20 days (Radioactive decay time)
- 16.55 days (Mean life calculation)
- Infinity (Resistance of an ideal voltmeter)
- Ultraviolet rays (Hydrogen spectrum series)
To rank as a top-tier educational resource, we analyze the core concepts tested in the 2025 Cumilla Board exam.
Thermodynamics and Efficiency
The exam tested the fundamental limit of heat engines. According to the Second Law of Thermodynamics, no engine can be one hundred percent efficient. This is why the answer for engine efficiency is always less than one. This concept is vital for students to remember for both board exams and engineering admission tests.
Modern Physics and Relativity
Several questions focused on Einstein’s Theory of Relativity, specifically length contraction and mass increase. When an object moves at a velocity close to the speed of light, its length appears to shorten to an observer, and its mass increases. The 2025 paper required students to understand the percentage changes in these physical quantities rather than just memorizing definitions.
Semiconductor Electronics
The Cumilla Board emphasized the behavior of transistors and logic gates. Understanding how base current affects collector current and how voltage gain is achieved in a circuit is essential. For the logic gate questions, the exam focused on the universal properties of NAND and NOR gates, which can be used to construct any other basic gate.
Nuclear Physics and Decay
Radioactivity remains a high-priority topic. The questions regarding half-life and mean life require students to understand that radioactive decay is a statistical process. Even after two half-lives, a portion of the substance remains, emphasizing the exponential nature of decay.
Improvement Points for Readers (Coach’s Critique)
To make this article outrank competitors and provide maximum value to students, here is the ruthless breakdown of what must be improved:
- Correct Subject Labeling: As noted, ensure the title matches the content. Mixing up 1st and 2nd papers will cause users to bounce from your site immediately, hurting your SEO ranking.
- Conceptual Logic vs. Memorization: Instead of just answering “20 days,” explain that 75 percent decay means 25 percent (or one-fourth) remains. Since one-fourth is the result of two half-lives, the answer is simply double the half-life. This “logical shortcut” is what high-performing students look for.
- Formatting for Scan ability: Use bold text for key terms and bullet points for lists. Search engine crawlers (and stressed students) prefer content that can be scanned in under 30 seconds.
- Visual Aids: High-performing educational articles should include diagrams of the “Logic Gates” or the “Energy Band Gap” to help visual learners.
Conclusion
The Cumilla Board 2025 Physics 2nd Paper was a balanced mix of theoretical knowledge and application-based problems. By reviewing these solutions, HSC candidates can identify their strengths and weaknesses. For more updates on HSC results and admission guidelines, stay tuned to Teachingbd24.com.
