Class 10th Science Important Guess Questions 2025 – Physics, Chemistry & Biology [Download PDF]
The JKBOSE Class 10th Board Exams 2025 are fast approaching, and Science remains one of the most crucial subjects for students across Jammu and Kashmir. With multiple chapters in Physics, Chemistry, and Biology, preparing effectively for each topic can seem challenging.
To simplify your preparation, Kashmir Student Alerts (KSA) brings you a comprehensive list of Class 10th Science Important Guess Questions 2025, carefully curated as per the JKBOSE syllabus and latest board exam trends.
This article includes chapter-wise important questions, numerical problems, and concept-based short notes that will help you revise efficiently before the exams. You can also download the complete PDF to keep a handy offline version for quick revision anytime.
⚡ Why You Should Practice Important Guess Questions
Before jumping into the list, it’s important to understand why solving guess papers and important questions plays a vital role in your exam preparation:
- They help you identify frequently asked concepts.
- Improve your answer writing skills with targeted practice.
- Boost speed and accuracy in numerical questions.
- Familiarize you with exam pattern and marking scheme.
- Enhance your confidence level before the final board exams.
By covering these selected important questions, you can ensure a strong performance in your Class 10th Science 2025 exam.
🔭 PHYSICS – Class 10th Science Important Guess Questions 2025
Physics is a scoring yet conceptual part of the Science syllabus. It includes topics such as reflection, refraction, electricity, and magnetism — each carrying numerical and diagram-based questions.
Light – Reflection and Refraction
This chapter introduces you to image formation using mirrors and lenses — a regular question in JKBOSE exams.
- Draw neat ray diagrams for image formation by concave and convex mirrors and lenses.
- Solve numerical problems using:
- Mirror formula:
- Lens formula:
- Magnification and Power of lens.
- Define and state Snell’s Law.
- Explain sign conventions and their applications in mirror/lens problems.
- Write the laws of reflection and refraction with diagrams.
📘 Tip: Labelled diagrams and correct formula substitution fetch full marks.
The Human Eye and the Colourful World
A high-scoring conceptual chapter on human vision and optical phenomena.
- Draw a well-labelled diagram of the human eye showing retina, cornea, iris, and lens.
- Explain the defects of vision — Myopia, Hypermetropia, Presbyopia — and their correction using lenses.
- Why do planets not twinkle but stars twinkle? Explain with reason.
- Describe dispersion of light and formation of a rainbow.
- Explain refraction through a glass prism with a diagram.
Electricity
A key numerical-based chapter that often carries 4–6 marks in exams.
- Solve numericals on:
- Heating effect of current
- Resistance in series & parallel
- Electrical power and energy
- Define resistance and its dependence on:
- Length of conductor
- Cross-sectional area
- Nature of material
- Temperature
- State and verify Ohm’s Law.
- Define electric current, potential difference, and resistance with their SI units.
- Derive formula for Electrical Power (P = VI) and Energy (E = Pt).
Magnetic Effects of Current
One of the most practical chapters with diagram-based questions.
- Write properties of magnetic field lines.
- State Fleming’s Left-Hand Rule.
- Describe magnetic field due to current-carrying circular loop and solenoid.
- Draw labelled diagram of the domestic electric circuit showing live wire, neutral wire, and fuse.
- Differentiate between a bar magnet and an electromagnet.
🧪 CHEMISTRY – Class 10th Science Important Guess Questions 2025
Chemistry tests your understanding of reactions, bonding, and applications in everyday life. This section covers four key chapters.
Chemical Reactions and Equations
This chapter lays the foundation for the entire Chemistry syllabus.
- Explain with examples:
- Combination reactions
- Decomposition reactions
- Displacement reactions
- Double displacement reactions
- Define corrosion and rancidity. Mention two prevention methods for each.
- Practice balancing of chemical equations (refer to JKBOSE Textbook Page 86, 99, 108 & 109).
- Write observations that indicate a chemical reaction has occurred.
Metals and Non-Metals
- What are amphoteric oxides? Give examples like Al₂O₃ and ZnO.
- Define minerals and ores with examples; explain the extraction of metals through roasting and reduction processes.
- Explain the formation of ionic compounds such as NaCl and MgO.
- State properties of ionic compounds — high melting point, solubility, conductivity.
- List physical and chemical properties of metals and non-metals with examples.
Acids, Bases, and Salts
This topic has real-life applications, making it both interesting and important.
- Describe chemical reactions of acids with:
- Metal Carbonates
- Metal Hydrogen Carbonates
- Metal Oxides
- Neutralisation reactions
- Explain pH scale and its importance in daily life (soil, stomach, and industry).
- Discuss indicators — litmus, phenolphthalein, and universal indicator.
- Write short notes on:
- Baking Soda (NaHCO₃)
- Washing Soda (Na₂CO₃·10H₂O)
- Hydrated salts
- Plaster of Paris (POP)
Carbon and Its Compounds
Carbon chemistry is vital due to its role in daily life and organic compounds.
- Explain the following reactions of carbon compounds with examples:
- Combustion
- Oxidation
- Substitution
- Addition
- Define Soaps and Detergents with examples and explain their cleaning mechanism.
- Write reactions of ethanol with:
- Sodium metal (formation of hydrogen gas)
- Ethanoic acid (esterification)
- Dehydration of ethanol (formation of ethene).
- Explain homologous series and functional groups.
🌿 BIOLOGY – Class 10th Science Important Guess Questions 2025
Biology emphasizes understanding of life processes, reproduction, heredity, and environment. Concept clarity and diagrams are key here.
Life Processes
- Define nutrition and explain modes of nutrition – autotrophic and heterotrophic with examples.
- (a) Describe the digestive system in humans with a labelled diagram.
(b) Differentiate between aerobic and anaerobic respiration. - Explain the structure and function of nephron.
- Describe the transport system in plants – xylem and phloem.
- Write about respiration and its types.
Control and Coordination
- Define reflex action with examples and explain role of brain in reflex actions.
- Draw a well-labelled diagram of the human brain showing cerebrum, cerebellum, and medulla.
- Write differences between exocrine and endocrine glands.
- Draw and label a neuron, mentioning functions of dendrites, axon, and axon terminals.
- Explain hormonal coordination in plants and animals.
How Do Organisms Reproduce
- Draw male and female reproductive systems with labels.
- Difference between sexual and asexual reproduction.
- Define reproduction and explain modes of reproduction like fission, budding, and spore formation.
- Describe sexual reproduction in flowering plants (pollination, fertilisation, fruit formation).
- Write short notes on binary fission and regeneration.
Heredity
- Difference between acquired and inherited traits.
- Explain sex determination in humans.
- Describe Mendel’s experiments on pea plants and laws of inheritance.
- What are dominant and recessive traits? Give examples.
- Define variation and its importance in evolution.
Our Environment
- Define Ecosystem and explain its components – biotic and abiotic.
- Explain Food Chain and Food Web with examples.
- How can we manage garbage and reduce pollution?
- Write notes on Ozone layer depletion and its effects on life.
- What happens when we add waste to our environment?
📘 NUMERICAL QUESTIONS FOR PRACTICE (Physics)
- A 220V bulb draws 0.5A current. Find its power.
- An iron of resistance 20Ω takes 5A current. Find heat produced in 30s.
- 100J of heat produced each second in 4Ω resistor. Find potential difference.
- A 400W refrigerator runs 8 hours/day. Find cost of energy for 30 days at ₹3/kWh.
- An electric motor draws 5A at 220V. Find power and energy used in 2 hours.
- An iron consumes 840W (max) & 360W (min) at 220V. Find current and resistance.
- Find power of concave lens of focal length 2m.
- Find focal length of lens with power –2.0D and identify lens type.
- A plane mirror produces magnification +1. What does it mean?
- A corrective lens of +1.5D is prescribed. Find focal length and type of lens.
- Find focal length of convex mirror (R = 32cm).
- An object 7cm high is placed 27cm before concave mirror (f = 18cm). Find image position & size.
- An object 5cm high is 20cm in front of convex mirror (R = 30cm). Find image details.
- An object 5cm is 25cm away from convex lens (f = 10cm). Find position & nature of image.
- An object 4cm is 25cm before concave mirror (f = 15cm). Find screen distance & size of image.
📥 Download Complete PDF – Class 10th Science Important Guess Questions 2025
For easy offline study and quick revision, download the official PDF containing all the important questions listed above:
📄 Click Here to Download the PDF
This comprehensive PDF helps students revise all essential concepts, formulas, and diagrams — a must-have for every JKBOSE Class 10th Science student.
🎯 Preparation Tips for JKBOSE Class 10th Science Exam 2025
- Follow the JKBOSE syllabus and study every chapter thoroughly.
- Focus on concept clarity rather than rote memorization.
- Practice numerical questions daily to strengthen your calculations.
- Use diagrams and labelled drawings in your Biology and Physics answers.
- Revise daily — consistency is key to success.
- Attempt previous year question papers and sample tests.
- Highlight definitions, formulae, and reactions for quick reference before exams.
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