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CBSE Exam 2025 Sample Papers: Class 10 Science - Key Points

• These sample papers are based on the SQP released by CBSE and are for practice only
• CBSE does not release these papers and is not related to them
• Publisher of these papers say they are exclusively for student practice and the questions may not appear in main exam

General Instructions for the Exam

• All questions will be compulsory, but internal choice will be provided in approximately 33% of questions
• 50% of the marks are allotted to competency-based questions
• Section A contains 16 simple or complex MCQs and 4 Assertion-Reasoning questions, each carrying 1 mark
• Section B contains 6 Short Answer (SA) type questions, each carrying 2 marks
• Section C contains 7 Short Answer (SA) type questions, each carrying 3 marks
• Section D contains 3 Long Answer (LA) type questions, each carrying 5 marks
• Section E contains 3 source/case/passage-based integrated units of assessment, each carrying 4 marks with sub-parts of 1/2/3 marks

Sample Questions and Concepts (Paper 01)

• Balancing chemical equations is tested with an example involving aluminum and oxygen reacting to form aluminum oxide. 4 moles of aluminum react with 3 moles of oxygen to form 2 moles of aluminum oxide.
• pH values are given for lemon (2.3), seawater (8.5), and apple (3.1); the pH of battery acid is missing
• Magnesium ribbon must be cleaned with sandpaper before burning to remove magnesium oxide from surface
• Refraction: Light bends towards base when entering prism; emergent ray bends from incident ray
• Gaseous exchange in woody stems involves lenticels
• Feature common to reproduction in Amoeba, Spirogyra, and yeast: They reproduce asexually
• Ethane (C2H6) on complete combustion yields CO2 and water; the coefficient of oxygen (O2) needed is 7/2.
• Achromatic combination of prisms results in deviation when white light passes through
• Exposure of silver chloride to sunlight; it turns grey due to formation of silver by its decomposition
• Mineral acids are stronger than carboxylic acids because mineral acids are completely ionized
• Posture and balance are controlled by cerebellum
• A device used to determine focal length using a screen is a Convex lens.
• Magnesium metal reacts with steam to form magnesium hydroxide and evolves hydrogen gas
• Photosynthesis is an endothermic reaction
• Pancreas secretes insulin to regulate blood sugar levels
• Artificial kidney removes nitrogenous waste from blood via dialysis
• Resistivity and conductivity product depends on conductor material
• Preservation required in ecosystem: Producers and decomposers

Assertion-Reasoning Question Examples(Paper 01)

• Photosynthesis: It is endothermic because it consumes energy, not exothermic
• Blood sugar: Body maintains, pancreas through insulin
• Artificial kidney: removes nitrogenous waste through dialysis. Reabsorption doesn't occur
• Resistivity/conductivity: Product linked to conductor material

Sample Questions (Paper 02)

• Quicklime combining with water to form (A); (A) reacts with air to form (B); (A) is calcium hydroxide; (B) is calcium carbonate
• Rusting prevention methods: painting, galvanization, alloying
• Unsaturated compounds identified from propane, propene, propyne, chloropropane: propyne and chloropropane
• Feasible reaction determined for Ba(s) + K2SO4(aq), Zn(s) + 2AgNO3(aq), Mg(s) + Na2SO4(aq), and Cu(s) + MgSO4(aq); Zn(s) + 2AgNO3(aq) is feasible
• Displacement reaction example: Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
• Maximum energy determined in trophic levels: in a pyramid, T1
• Transformation of light energy to chemical energy and splitting of water is called: photosynthesis
• Color from white light dispersion that matches color of the sky: third color from the top
• A round green pea plant crossed with a wrinkled yellow one: F1 generation is round and yellow
• Electrical impulse travels in neuron: dendrite to cell body to axon
• Modern safety match contains antimony sulfide; the modern head contains potassium chlorate
• Testes at puberty: Formation of germ cells and secretion of testosterone
• Resistors in series: Heat dissipated changes if resistance changes
• 4V battery across unknown resistor yields 100mA current; resistance is 40 Ohms
• Rainbows: produced by reflection not refraction
• Traits(ex: eye color): inherited from biological parents; not transferred to young ones
• Assertion: Aerobic animals and true: Produce lactic acid
• Assertion: Electrical appliances must be grounded ; electric bulb doesn't . It is to reduce heating of wires.

Sample Questions (Paper 03)

• Identifying 'x', 'y', and 'z' in a balanced reaction: Hydrogen and oxygen forming water
• Correct combinations of metal/dilute HCl that evolve gas
• Conclusion from exhaling into a test tube with lime water: Percentage (%) of carbon dioxide more in exhaled air vs inhaled
• Wire resistance with time heat produced; In 3 seconds would be 28J
• Magnetic field of a solenoid is shown.
• Direction of magnetic field depends on "Right Hand Thumb Rule"
• Curry stains on white shirts turn reddish-brown with soap, then yellow, because soap is basic in nature

Key Biological Facts (Paper 03)

• Female changes change during puberty: All organs grow, Breast Size Increases, hairs grow
• Color of solution after mixing equal volumes acid/base: would become green
• Flow of impulses in the brain are in one direction.
• Two bulbs, +120/220 have ratio of their resistance is 4:1
• Diaphragm flattens when we inhale and assists in lung filling
• Identifying incorrect observations when calcium oxide reacts with water: endothermic
• Setups where bulb's glow are explained as they use HCl to complete circuit.
• Offspring probability from parents AA x aa is 0% chance that the offspring will have an small (aa) genotype.

More Key Facts - Assertion and Reasoning (Paper 03)

• Accumulation increases species adaptation ability"
• A solenoid expands because wires repel each other
• "Oxy + Deoxy separates bc Mammals are warm + depend on stable temperature"
• ""Vegetable decomposition is endothermic, but the reason is different""
• Size of eyeballs lead to myopia , and hyperopia

Sample Paper 4

Key Science Questions

• Relation between x,y,z in balanced equations.
• Categories of water hardness.
• Gases formed during electrolysis.
• Properties: Of metal sulphide on heating/reactivity.
• Strength of magnetic field of a current carrying solenoid.

Biology Questions

• Vegetative propagation: From stem, roots, leaves.
• Energy output/types of respiration.
• Transpiration; the process of water movement through a plant.
• "Identify V-I Graph for the two wires A and B are shown in the figure"
• Father of genetics.

Chemistry Questions

• "What is the maximum resistance which can be made using five resistors each of . Ω"
• "In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate,a yellow precipitate of lead iodide is formed."

Assertion and Questions

• Reduction is removal of hydrogen.
• Gender depends on chromosome from father.
• Resorption of intestines by absence of cilia is false.
• Velocity changes according to magnetic field

Sample Chemistry Questions (Paper 05)

• Balancing equations is a core skill in chemistry.

Key Points

• The statement of law of conservation of mass is mass can neither be created nor be destroyed.
• A "compact device that uses an organic compound (CHO) reacting with sodium metal to produce hydrogen gas." The student knows about the components of human nervous. ""Chemical equations can be made more informative"
• Key concepts from Physics.
• No matter how far you stand from a mirror, your image appears erect.

Sample Questions (Paper 8)

• Identify the type of respiration that occurs in the process.

Sample Chemistry Questions (Paper 11)

• In questions to do with chemical the molecular formulas of compounds

Sample Questions (Paper 12)

Key Concepts

• Chemical equations can be made more informative that we can write physical state of reactants and products, temperature and pressure, name of catalyst that we may used..
• What should the angle of incidence of ray diagrams

Biology Question

• In Table 1 for the given sample what does the solution do?

Sample Key Concepts Science 10 (Paper 13)

• In questions to with what is the right code the knowledge of coding skills

Key Biology Facts to note:

• Accumulation of variation in a specifies the chances of its survival in changing the environment.
• Traits like eye color/height are inherited
• What are the types of energy can come from organisms on Earth.
• Electrical power depends upon potential difference.

Science Key Concepts (Question 1 to 16) (Paper 15)

• Silver becomes black because to the formation of silver.
• Statement that describe the characteristics of genes.

The Key Reasoning (Paper 15)

• The balancing of chemical equations is based on law of conservation of mass
• Plant hormones are growth regulator.
• In woody plants,gascous exchange occurs through lenticels.
• The reason: is if the force of wire.

Important Question (Sample Paper 16 Paper 1

• You are to identify and give correct for what is the nature of some materials used in building the solar system.

Sample Questions

Sample Paper 17

• The student needs to know what is the correct function of B and C in the Excretory System.

Sample Paper 17

• The student should note the correct equations

Sample Paper 1

• Know the balanced equations and to give reasons for the question

Sample Paper 18

• 3 to 5 - are Long answer questions
• There be more emphasis in Section B

Sample Paper 24/ Science

• Which one correct formula for water.

Multiple Choice questions

• (i) that all the question contain a limited of choices.
• Note, if question will likely be asked in question number in 17.

Key information (Qn no 34 to 36)

• The questions are most Likely to the same from every years of study by students often.

Last key note.

• All the questions are Likely to the same year as students do have same information to study from and the answers from sample papers are almost same as well but there are some mixed information to look into