JKBOSE 12th Class Important Guess Questions for Physics, Chemistry, Zoology & Botany (2025)

The Jammu and Kashmir Board of School Education (JKBOSE) 12th Class exams are crucial for students aiming for higher studies in science and medical fields. To help students prepare effectively, we have compiled important guess questions for Physics, Chemistry, Zoology, and Botany based on past trends and expert analysis.

📌 Physics – Important Guess Questions

Electrostatics & Current Electricity

1. State and explain Gauss’s law. Derive an expression for the electric field due to an infinite charged plane sheet.
2. What is a capacitor? Derive the formula for the capacitance of a parallel plate capacitor.
3. Define Kirchhoff’s laws and apply them to solve a circuit problem.
4. Explain the principle and working of a potentiometer. How is it used to measure internal resistance?
5. Discuss the concept of drift velocity and derive Ohm’s law using it.

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Magnetism & Electromagnetic Induction

6. Explain the concept of the magnetic field and derive the expression for the magnetic field due to a current-carrying circular loop.
7. State and explain Faraday’s laws of electromagnetic induction with applications.
8. What is self-induction? Derive an expression for the coefficient of self-induction.
9. Describe the working of a moving coil galvanometer and its conversion into an ammeter and voltmeter.

Modern Physics & Optics

10. Explain the photoelectric effect and derive Einstein’s photoelectric equation.
11. Discuss the characteristics of X-rays and their applications in medicine.
12. What is total internal reflection? Explain its applications in optical fibers.
13. Describe the principle, working, and formula of Young’s Double-Slit Experiment.
14. Define the half-life of a radioactive substance and derive its mathematical expression.

📌 Chemistry – Important Guess Questions

Physical Chemistry

1. Derive the relation between Kp and Kc for a gaseous reaction.
2. What are colligative properties? Explain the concept of osmotic pressure.
3. Explain the Freundlich adsorption isotherm and its applications.
4. Define electrochemical series. Explain its importance in predicting the feasibility of a redox reaction.

Organic Chemistry

5. Describe the mechanism of nucleophilic substitution reactions (SN1 & SN2).
6. Explain the structure and properties of glucose. How is it converted into fructose?
7. What are polymers? Classify them with examples and discuss their uses.
8. Define isomerism and explain the types of structural isomerism with examples.

Inorganic Chemistry

9. Explain the crystal field theory (CFT) with reference to octahedral and tetrahedral complexes.
10. Discuss the manufacture of ammonia by the Haber process and its industrial applications.
11. What are lanthanides and actinides? Discuss their electronic configuration and oxidation states.
12. Explain the preparation, properties, and uses of potassium permanganate (KMnO₄).

📌 Zoology – Important Guess Questions

Human Physiology & Genetics

1. Explain the structure and functioning of the human heart with a neat diagram.
2. Discuss the process of digestion and absorption in the human digestive system.
3. What is the role of hormones in the human body? Explain with examples.
4. Define mutation. Explain different types of gene mutations with examples.
5. Describe the human excretory system and explain the process of urine formation.

Reproductive Biology & Evolution

6. Explain the structure and function of the female reproductive system.
7. What are reproductive health and birth control methods? Discuss their importance.
8. Discuss Darwin’s theory of natural selection with examples.
9. What is DNA fingerprinting? Explain its applications in forensic science.
10. Describe the human nervous system with a labeled diagram.

📌 Botany – Important Guess Questions

Plant Physiology & Biotechnology

1. What is photosynthesis? Explain the light-dependent and light-independent reactions.
2. Describe the structure and function of mitochondria.
3. Define plant growth regulators and explain the role of auxins and gibberellins.
4. Explain the process of nitrogen fixation in plants.
5. Discuss the principles and applications of tissue culture in plant biotechnology.

Cell Biology & Genetics

6. What is the cell cycle? Describe its different phases.
7. Define chromosomal disorders. Explain Down syndrome and Turner syndrome.
8. Explain Mendel’s laws of inheritance with suitable examples.
9. What is recombinant DNA technology? Explain its applications.
10. Describe the process of transcription and translation in protein synthesis.

🔍 Exam Tips for JKBOSE 12th Science Students

✔ Revise NCERT textbooks thoroughly as most questions are based on them.
✔ Solve previous years’ papers to understand the exam pattern.
✔ Focus on numerical problems in Physics and Chemistry.
✔ Prepare labeled diagrams for Biology subjects.
✔ Practice derivations and conceptual explanations regularly.

By preparing these important questions, students can boost their confidence and enhance their chances of scoring well in the JKBOSE 12th Board Exams 2025. Best of luck!