CBSE 2026 31/7/1 question paper with solutions
Every question from the CBSE 2026 31/7/1 paper, 45 in total, with the official answer and a worked explanation for each. Open any question to read the solution, or sign in to attempt the paper against the clock.
CBSE 2026 31/7/1 Science (45)
- #225Protein digesting enzyme in stomachCentral Board of Secondary EducationSCIMCQEasy
- #226Function of transpirationCentral Board of Secondary EducationSCIMCQEasy
- #227Growth of tendril in pea plantCentral Board of Secondary EducationSCIMCQMedium
- #228Hormone regulating metabolismCentral Board of Secondary EducationSCIMCQEasy
- #229Bacterial sexually transmitted diseasesCentral Board of Secondary EducationSCIMCQMedium
- #230Mendelian monohybrid cross F2 ratioCentral Board of Secondary EducationSCIMCQEasy
- #231Steps in photosynthesisCentral Board of Secondary EducationSCIMCQEasy
- #232Assertion-Reason: Ventricle wall thicknessCentral Board of Secondary EducationSCIMCQMedium
- #233Assertion-Reason: Sex determination in reptiles and humansCentral Board of Secondary EducationSCIMCQMedium
- #234Ozone layer formation, role and depletionCentral Board of Secondary EducationSCITITAEasy
- #235Chromosome number in plant gametes and zygoteCentral Board of Secondary EducationSCITITAMedium
- #236Longitudinal section of flower diagramCentral Board of Secondary EducationSCITITAMedium
- #237Asexual reproduction in Hydra and PlanariaCentral Board of Secondary EducationSCISET · 3QMedium
- #238Breakdown pathways of pyruvate in respirationCentral Board of Secondary EducationSCISET · 3QEasy
- #239Ecosystem and biomagnificationCentral Board of Secondary EducationSCISET · 3QMedium
- #240Case Study: Bread-wheat genome and DNACentral Board of Secondary EducationSCISET · 4QMedium
- #241Limitations of electrical impulses and plant vs animal movementsCentral Board of Secondary EducationSCISET · 3QHard
- #242Reflex arc and brain control partsCentral Board of Secondary EducationSCISET · 2QMedium
- #243Amphoteric oxide forming metalCentral Board of Secondary EducationSCIMCQEasy
- #244Heating ferrous sulphate crystalsCentral Board of Secondary EducationSCIMCQEasy
- #245Functional group in ButanalCentral Board of Secondary EducationSCIMCQEasy
- #246Exothermic processes identificationCentral Board of Secondary EducationSCIMCQMedium
- #247Structure of soap moleculeCentral Board of Secondary EducationSCIMCQEasy
- #248Properties of acidsCentral Board of Secondary EducationSCIMCQEasy
- #249Self-linking property of carbonCentral Board of Secondary EducationSCIMCQEasy
- #250Assertion-Reason: Burning of natural gasCentral Board of Secondary EducationSCIMCQMedium
- #251Identification of baking compound X and gas YCentral Board of Secondary EducationSCITITAMedium
- #252Oxidation and Esterification reaction of EthanolCentral Board of Secondary EducationSCITITAHard
- #253Reasons: Addition reactions, detergents, and covalent carbonCentral Board of Secondary EducationSCITITAMedium
- #254Reaction of Quicklime with WaterCentral Board of Secondary EducationSCITITAEasy
- #255Case Study: Salts, POP, Bleaching Powder and Water of CrystallizationCentral Board of Secondary EducationSCISET · 4QMedium
- #256Extraction of metals and properties of ionic compoundsCentral Board of Secondary EducationSCISET · 2QHard
- #257Electrolytic refining and corrosion preventionCentral Board of Secondary EducationSCISET · 3QMedium
- #258Statements on mirrors and lensesCentral Board of Secondary EducationSCIMCQMedium
- #259Properties of SolenoidCentral Board of Secondary EducationSCIMCQEasy
- #260Assertion-Reason: Refraction and Snell's lawCentral Board of Secondary EducationSCIMCQMedium
- #261Circuit analysis with parallel and series combinationCentral Board of Secondary EducationSCITITAMedium
- #262Combination of three 6-ohm resistorsCentral Board of Secondary EducationSCITITAMedium
- #263Magnetic field pattern of circular loopCentral Board of Secondary EducationSCITITAEasy
- #264Myopia causes, image formation and correctionCentral Board of Secondary EducationSCITITAMedium
- #265Atmospheric refraction phenomenaCentral Board of Secondary EducationSCITITAMedium
- #266Role of fuse and earth wire in domestic circuitCentral Board of Secondary EducationSCITITAMedium
- #267Case Study: Refraction through glass slab and prismCentral Board of Secondary EducationSCISET · 4QMedium
- #268Household energy consumption calculationCentral Board of Secondary EducationSCISET · 3QMedium
- #269Resistivity, ammeter reading and wire resistanceCentral Board of Secondary EducationSCISET · 3QMedium