BSEB 12th Exam Pattern for Science 2026: Check Marking Scheme, Types of Questions, Difficulty Level

1

Solid State                             

• Electrical and magnetic properties, Packing efficiency, voids, number of atoms per unit cell in a cubic unit cell, point defects, etc.

4

2

Solutions

• Osmotic pressure, determination of molecular masses using colligative properties, Elevation of boiling point, depression of freezing point, abnormal molecular mass, etc.

5

3

Electrochemistry

• Kohlrausch’s Law, lead accumulator, Conductance in electrolytic solutions, specific, variations of conductivity with concentration, etc.

5

4

Chemical Kinetics

• Integrated rate equations and half-life, the concept of collision theory (elementary idea, no mathematical treatment), etc.

5

5

Surface Chemistry

• Brownian movement, electrophoresis, Lyophobic multimolecular and macromolecular colloids; properties of colloids; Tyndall effect, coagulation, emulsion-types of emulsions, etc.

4

6

General Principles and Process of Isolation of Elements

• Occurrence and principles of extraction of aluminium, copper, zinc and iron, Principles and methods of extraction – concentration, oxidation, reduction – electrolytic method and refining; etc.

3

7

P-Block Elements

• Halides PCl3, Ozone, Sulphur-allotropic forms; Phosphorus – allotropic forms, Preparation properties and uses of sulphur-dioxide, etc.

8

8

d-and-f-Block Elements

• Magnetic properties, interstitial compounds, Metallic character, ionization enthalpy, preparation and properties of K2Cr2O7 and KMnO4, etc.

5

9

Coordination Compounds

• IUPAC nomenclature of mononuclear coordination compounds. Bonding, Introduction, ligands, coordination number, Werner’s theory, VBT, and CFT; structure and stereoisomerism, etc.

3

10

Haloalkanes and Haloarenes

• Nomenclature, nature of C-X bond, physical and chemical properties, substitution reactions, etc.

4

11

Alcohols, Phenols, and Ethers

• Mechanism of dehydration, physical and chemical properties, uses, uses with special reference to methanol and ethanol, etc.

4

12

Aldehydes, Ketones, and Carboxylic Acids

• Nomenclature, nature of carbonyl group, methods of preparation, physical, uses, methods of preparation, etc.

6

13

Organic Compounds Containing Nitrogen

• Classification, structure, methods of preparation, secondary and tertiary amines, etc.

4

14

Biomolecules

• Monosaccharides (glucose and fructose), polysaccharides (starch, cellulose, glycogen) importance, etc.

4

15

Polymers

• Biodegradable and non-biodegradable polymers, etc, Some important polymers: natural and bakelite, rubber, etc.

3

16

Chemistry In Everyday Life

• Tranquillizers antiseptics, disinfectants, antacids, antihistamines, artificial sweetening agents, etc.

3

Total

70

1

Electrostatics

• Electric Charges, Conservation of charge, Coulomb’s law-force between two point charges, forces between multiple charges, the electrical potential energy of a system of two point charges and of electric dipole in an electrostatic field, etc.

8

2

Current Electricity

• Ohm’s law, electrical resistance, V-I characteristics (linear and nonlinear), electrical energy and power, electrical resistivity and conductivity, Kirchhoff’s laws, and simple applications. Wheatstone bridge, metre bridge, etc.

7

3

Magnetic Effect of Current and Magnetism

• Torque on a magnetic dipole (bar magnet) in a uniform magnetic field; bar magnet as an equivalent solenoid, Force on a moving charge in a uniform magnetic and electric fields, Earth’s magnetic field and magnetic elements, etc.

8

4

Electromagnetic Induction and Alternating Current

• Electromagnetic induction; Faraday’s law, induced emf and current; Lenz’s Law, peak and RMS value of alternating current/voltage; reactance and impedance, etc.

8

5

Electromagnetic Waves

• Electromagnetic waves, their characteristics, their transverse nature, Electromagnetic spectrum, including elementary facts about their uses, etc.

3

6

Optics

• Refraction of light, total internal reflection and its applications, lensmaker’s formula. Magnification, power of a lens, Reflection of light, spherical mirrors, mirror formula, a combination of thin lenses in contact, etc.

14

7

Dual Nature of Matter and Radiation

• Matter waves-wave nature of particles, de Broglie relation, Photoelectric effect, Hertz and Lenard’s observations; Einstein’s photoelectric equation-particle nature of light, Davisson-Germer experiment, etc.

4

8

Atom and Nuclei

• Bohr model, energy levels, hydrogen spectrum, Composition and size of nucleus, Alpha-particle scattering experiment; Rutherford’s model of atom; atomic masses, isotopes, radioactive decay law, etc.

6

9

Electronic Devices

• Transistor as a switch, I-V characteristics of the transistor, transistor as an amplifier (common emitter configuration), the basic idea of analogue and digital signals, etc.

7

10

Communication System

• Propagation of electromagnetic waves in the atmosphere, amplitude modulation.
• Production and detection of an amplitude-modulated wave, etc.

5

Total

70

1

Sexual Reproduction

• Pollination and fertilization in flowering plants.
• Development of seed and fruit
• Human Reproduction, pregnancy and parturition, etc.

06 

2

Genetics and Evolution

• Chromosome theory of inheritance,
• Deviations from Mendelism ratio,
• Sex determination in human beings: XX, XY, Linkage and crossing over, etc.

18 

3

Biology and Human Welfare

• Microbes in household food processing
• Industrial production
• Sewage treatment and energy generation, Cancer and AIDS, etc.

18 

4

Biotechnology and its Application

• Recombinant DNA technology
• Applications in Health
• Biosafety Issues, etc.

18 

5

Ecology and Environment

• Organisms and Populations
• Ecosystem
• Environmental Issues, etc.

10

Total

70