CASE BASED QUESTIONS - PHYSICS ( CLASS XII )

 

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PREPARED BY KVS ZIET MYSURU

PHYSICS

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Sure, here are some Case Based Questions (CBQs) for Class XII Physics, inspired by the format often used in KVS ZIET Mysuru:

Case Study 1: The Photoelectric Effect

Passage:

The photoelectric effect is the phenomenon where electrons are emitted from a material when it absorbs electromagnetic radiation, such as light.¹ This effect² was crucial in the development of quantum mechanics.³

Questions:

1. What is the minimum energy of a photon required to eject an electron from a metal surface called?

   • (a) Work function
   • (b) Threshold frequency
   • (c) Stopping potential
   • (d) Kinetic energy

2. How does the kinetic energy of the emitted electrons vary with the frequency of the incident light?

   • (a) Directly proportional
   • (b) Inversely proportional
   • (c) Independent
   • (d) Exponentially related

3. Explain the concept of threshold frequency in the context of the photoelectric effect.

4. Describe the role of the photoelectric effect in the operation of solar cells.

Case Study 2: Radioactive Decay

Passage:

Radioactive decay is the spontaneous transformation of an unstable atomic nucleus into a more stable one, usually accompanied by the emission of radiation.⁴ This process follows specific decay laws.

Questions:

1. What are the three main types of radioactive decay?

2. What is meant by the half-life of a radioactive substance?

3. Derive the relation between the number of undecayed nuclei (N) and the decay constant (λ).

4. A radioactive sample has a half-life of 10 days. How long will it take for the sample to decay to 1/8th of its initial activity?

Case Study 3: AC Circuits

Passage:

In an AC circuit, the voltage and current vary sinusoidally with time.⁵ The behavior of components like resistors, capacitors, and inductors in AC circuits differs from their behavior in DC circuits.

Questions:

1. What is the difference between resistance, reactance, and impedance in an AC circuit?

2. Explain the concept of resonance in an LCR circuit.

3. How does the power factor of an AC circuit affect the power consumption?

4. Describe the role of transformers in the transmission and distribution of electrical power.

Note: These are just sample CBQs. KVS ZIET Mysuru likely has its own specific style and difficulty level for their Class XII Physics assessments.

Key Considerations for Creating Effective CBQs:

• Real-world Context: Base the case studies on real-world applications of physics concepts to make them engaging and relevant.
• Higher Order Thinking Skills: Include questions that require students to analyze, interpret, evaluate, and apply their knowledge.
• Assessment Objectives: Ensure that the CBQs align with the learning objectives and assessment criteria outlined in the syllabus.
• Clarity and Conciseness: The case studies and questions should be clear, concise, and free from ambiguity.

I hope these sample CBQs provide a helpful starting point for your own question creation.

Case-based questions (CBQs) prepared by KVS ZIET Mysore for Class 12 Physics offer several advantages:

• Real-world Application: CBQs often present real-world scenarios, helping students connect theoretical concepts to practical situations. This makes learning more engaging and relevant.
• Higher-Order Thinking Skills: These questions encourage students to analyze, interpret, evaluate, and apply their knowledge, fostering critical thinking and problem-solving abilities.
• Application-Based Learning: CBQs emphasize the application of physics principles to solve real-world problems, preparing students for future challenges in academics and careers.
• Improved Conceptual Understanding: By exploring different aspects of a given scenario, students gain a deeper understanding of the underlying physics concepts.
• Enhanced Communication and Reasoning Skills: CBQs often require students to explain their reasoning and justify their answers, improving their communication and logical reasoning skills.
• Assessment of Multiple Competencies: CBQs assess a wide range of skills, including data analysis, interpretation, problem-solving, and critical thinking, providing a more comprehensive evaluation of student learning.
• Motivation and Engagement: The real-world context of CBQs can make learning more interesting and engaging, motivating students to delve deeper into the subject matter.¹

By incorporating CBQs into their learning and assessment strategies, KVS ZIET Mysore aims to provide students with a more meaningful and effective learning experience in Class 12 Physics.

Disclaimer: This information is based on general understanding and the potential benefits of case-based learning. The specific advantages of the CBQs prepared by KVS ZIET Mysore may vary depending on the content and design of the questions.