Karnataka PUC 2nd Year Exam 2 Booster - Blueprint Top 50 Science Questions 2027

In short: Karnataka PUC Exam 2 runs from May 3 to May 15, 2027 — roughly 7 weeks after Exam 1 ends on March 17. This guide is specifically for Science stream students using the second attempt to improve scores. We cover the top 50 blueprint-aligned questions across Physics, Chemistry, and Biology that carry the highest marks and repeat most frequently.

Why Exam 2 Matters for PUC Science

The best-of-two scoring rule means your Exam 2 marks replace Exam 1 marks only if they are higher. This creates a zero-risk opportunity: you either improve or keep your original score.

For chapter-wise weightage details, see Karnataka PUC Physics weightage and the PUC Science marks distribution guide.

The Exam 2 Advantage — What Changes

After Exam 1, you know the format firsthand. The Exam 2 strategy is different from standard preparation:

1. You know your weak spots. Exam 1 results show exactly where you lost marks.
2. The blueprint is identical. Same chapter weightage, same question types.
3. Less syllabus pressure. You only need to fix specific gaps, not re-learn everything.
4. Mental familiarity. No exam-hall anxiety from a first-time experience.

Top 50 Blueprint-Aligned Science Questions

Physics — Top 18 Questions (70 marks theory)

Electrostatics and Current Electricity (14-16 marks)

1. Derive the expression for the electric field due to a uniformly charged infinite plane sheet using Gauss's law. (5 marks)
2. Derive the relation between electric field and electric potential. (3 marks)
3. Derive the expression for capacitance of a parallel plate capacitor with a dielectric medium. (5 marks)
4. State and explain Kirchhoff's rules. Solve a Wheatstone bridge numerical to find unknown resistance. (5 marks)
5. Derive the condition for balance in a Wheatstone bridge. (3 marks)

Electromagnetic Induction and AC (10-12 marks)

6. State Faraday's laws of electromagnetic induction. Derive the EMF induced in a coil rotating in a uniform magnetic field. (5 marks)
7. Derive the expression for impedance and current in a series LCR circuit. What is resonance? (5 marks)
8. Explain the working of a transformer. Derive the turns ratio. Why is the core laminated? (5 marks)

Optics (12-14 marks)

9. Derive the mirror formula for a concave mirror. (5 marks)
10. Derive Snell's law using Huygens' wave theory. (5 marks)
11. Explain Young's double slit experiment. Derive the expression for fringe width. (5 marks)
12. What are polaroids? Explain polarisation by reflection and state Brewster's law. (3 marks)

Modern Physics (8-10 marks)

13. State the laws of photoelectric emission. Derive Einstein's photoelectric equation. (5 marks)
14. Explain Bohr's postulates. Derive the expression for the radius of the nth orbit of hydrogen atom. (5 marks)

Semiconductor Electronics (6-8 marks)

15. Explain the working of a full-wave rectifier with a circuit diagram and input/output waveforms. (5 marks)
16. Explain the working of an NPN transistor as a common-emitter amplifier. Draw the circuit diagram. (5 marks)

Magnetism and Nuclear Physics (6-8 marks)

17. Derive the expression for the magnetic field at a point on the axis of a circular current loop. (5 marks)
18. Explain nuclear fission and fusion with examples. Why is the mass of a nucleus less than the sum of masses of its nucleons? (3 marks)

Chemistry — Top 16 Questions (70 marks theory)

Solutions and Electrochemistry (10-12 marks)

19. State and explain Raoult's law for a solution of volatile liquids. Define positive and negative deviations with examples. (5 marks)
20. Derive the relationship between relative lowering of vapour pressure and mole fraction of solute. (3 marks)
21. Define molar conductivity. How does it vary with concentration for strong and weak electrolytes? Draw graphs. (5 marks)
22. State and explain Faraday's first and second laws of electrolysis with examples. (5 marks)

Chemical Kinetics and Surface Chemistry (8-10 marks)

23. Derive the integrated rate equation for a first-order reaction. How do you determine the rate constant graphically? (5 marks)
24. What are colloidal solutions? Explain the electrical properties with reference to Helmholtz electrical double layer. (3 marks)

Coordination Compounds and d-Block (8-10 marks)

25. What is crystal field theory? Explain crystal field splitting in octahedral complexes. (5 marks)
26. Write the IUPAC names of three given coordination compounds. Identify oxidation state, coordination number, and geometry. (3 marks)
27. What are lanthanoids? Explain lanthanoid contraction and its consequences. (3 marks)

Organic Chemistry (18-20 marks)

28. What are SN1 and SN2 reactions? Explain with mechanism, examples, and stereochemical outcome. (5 marks)
29. How is phenol prepared from cumene? Explain the acidity of phenol compared to alcohols. (3 marks)
30. Give the mechanism of aldol condensation. What is a cross-aldol condensation? (3 marks)
31. Explain the Hofmann bromamide degradation reaction. Write the product from a given amide. (3 marks)
32. What are carbohydrates? Classify them. Explain the structure of glucose with evidence. (5 marks)
33. What is the difference between addition and condensation polymerisation? Give two examples of each. (3 marks)
34. Write short notes on: (a) Coupling reaction of diazonium salts (b) Sandmeyer reaction (c) Gabriel phthalimide synthesis. (3 marks)

Biology — Top 16 Questions (70 marks theory)

Reproduction (12-14 marks)

35. Describe the process of microsporogenesis. Draw a labelled diagram of a mature pollen grain. (5 marks)
36. Describe the structure of a mature embryo sac. What is double fertilisation and triple fusion? (5 marks)
37. Explain the stages of embryo development in dicots up to the heart-shaped stage. (3 marks)
38. What are the various methods of birth control? Explain any three with diagrams. (5 marks)

Genetics and Molecular Biology (14-16 marks)

39. Explain Mendel's law of independent assortment with a dihybrid cross. Show the 9:3:3:1 ratio using a Punnett square. (5 marks)
40. Explain the Hershey-Chase experiment that proved DNA is the genetic material. (5 marks)
41. Describe the process of transcription in eukaryotes. What is RNA splicing? (5 marks)
42. Explain the lac operon model of gene regulation. Draw a diagram. (5 marks)

Evolution and Biology in Human Welfare (8-10 marks)

43. What are the evidences of evolution? Explain homologous and analogous organs with examples. (5 marks)
44. Describe the life cycle of Plasmodium. How does malaria spread? (5 marks)

Biotechnology (8-10 marks)

45. Explain the steps involved in recombinant DNA technology. Draw a flowchart. (5 marks)
46. What are transgenic animals? Give three examples with their applications. (3 marks)

Ecology (8-10 marks)

47. Describe the energy flow in an ecosystem. Explain the 10% law with a diagram. (5 marks)
48. What is ecological succession? Differentiate between primary and secondary succession with examples. (5 marks)
49. Describe the structure of an ecosystem. Explain the different trophic levels with a food web diagram. (3 marks)
50. What are the causes of biodiversity loss? Explain IUCN categories of threatened species. (3 marks)

Exam 2 Priority — Where to Gain Maximum Marks

7-Week Exam 2 Study Plan for Science

For answer writing tips that earn full marks and time management in 3-hour papers, see our strategy guides.

Frequently Asked Questions

Can I attempt only specific subjects in Exam 2?

Yes. You can choose to attempt only the subjects where you want improvement. The best-of-two rule applies per subject independently.

Is the Exam 2 paper set by a different team?

Yes. Different question paper setters prepare Exam 2, but they follow the identical DPUE blueprint. The chapter weightage and question types remain the same.

Will colleges see both Exam 1 and Exam 2 scores?

Colleges see only your final marksheet which shows the best score per subject. The lower score is not disclosed.

How do I get my Exam 1 results before Exam 2?

Karnataka typically releases Exam 1 results with enough time before Exam 2. Check kseab.karnataka.gov.in for result dates. Even without official results, your own assessment of the paper can guide Exam 2 preparation.

Is there extra fee for Exam 2?

Check the KSEAB notification for the current year fee. Typically there is a nominal registration fee for Exam 2. If you are anxious about the exams, remember that Exam 2 is a safety net, not additional pressure.

Should PCB students also prepare for Exam 2?

If you scored below your target in any Science subject in Exam 1, absolutely. Even a 5-10 mark improvement per subject can significantly affect your overall percentage and competitive exam eligibility.

Related Guides

• Karnataka PUC Class 12 Physics Chapter Wise Weightage
• Karnataka PUC Class 12 Chemistry Chapter Wise Weightage
• Karnataka PUC Science Marks Distribution
• Board Exam Answer Sheet Write for Maximum Marks
• Board Exam Time Management Strategy
• How to Study Smart Not Hard

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