CBSE sample question paper 2026: With the CBSE Class 10 board exams around the corner, students often struggle to prioritise what to study in the vast Science syllabus. The 2025-26 sample paper released by CBSE offers valuable clues. Experts and teachers recommend focusing on high-yield, concept-driven questions that are likely to be repeated in similar formats. These questions not only test a student’s understanding of fundamental principles but also integrate real-life applications, making them ideal for thorough revision.Students can access the official sample question paper released by CBSE by visiting the board’s website, cbseacademic.nic.in. The same can also be downloaded by clicking on the link provided below. Direct link to download CBSE class 10 science sample question paper 2025 here.
Important questions from CBSE class 10th science sample paper
Based on the official sample paper, here are five such important questions, carefully selected from Biology, Chemistry and Physics, that every Class 10 student must master. These are not just likely to appear in exams, but also build a strong foundation for higher classes and competitive exams.Question: Puneet wanted to grow banana plants. (5 marks)
- Based on your knowledge on plant reproduction should he opt for seeds or any alternate method of reproduction. Justify your answer.
- Offsprings of a banana plant usually show very little variation. What causes variation and are variations good or bad? Justify.
Question: A hydrocarbon with the formula CxHy undergoes complete combustion as shown in the following equation: 2CxHy + 9O2 → 6CO2 + 6H2O. (5 marks)
- What are the values of ‘x’ and ‘y’?
- Give the chemical (IUPAC) name of the hydrocarbon.
- Draw its electron dot structure.
- Name the alcohol which on heating with conc. H2SO4 will produce the above hydrocarbon CxHy.
- Write a balanced chemical equation for the reaction of CxHy with hydrogen gas in presence of Nickel.
Question: The arrangement of resistors shown in the figure below is connected to a battery.; The power dissipation in the 100 Ω resistor is 81 W. (5 marks)
Calculate:
- the current in the circuit
- the reading in the voltmeter V2
- the reading in the voltmeter V1
Question: In a genetic experiment, plants with pure round green seeds (RRyy) were crossed with plants with wrinkled yellow seeds (rrYY). (3 marks)
- Show the gametes formed when F1 was self-pollinated.
- A total of 144 seeds were produced which developed into saplings. Show the ratio in which these traits are independently inherited in these144 sapling.
Question: Zarina worked as an apprentice in a factory where flashlights and solar cookers are made. She learnt to make the circuits, the design of the light-box and light concentrators of the solar cookers as well. She learnt the uses of lenses in making all those tools. Based on your understanding of lenses, answer the following questions. (4 marks)
- What kind of lenses are used in the flashlight and light concentrator of the solar-cooker?
- Give reasons for your choices in your answer for part A.
Attempt either of the two subparts.
- An object is placed 40 cm away from a lens which is normally used in a solar-cooker. The image formed is twice the size of the object. Calculate the focal length of the lens. OR
- An object is placed 20 cm in front of a lens which is used in a flashlight, and the image is formed 10 cm away from the lens on the same side as the object. Calculate the focal length of the lens.
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