CBSE 10 Science Answer Key 2026: The Central Board of Secondary Education (CBSE) has concluded the Class 10th Science Board Exam 2026 today, February 25, 2026, at various centres. As per the schedule, the 80-mark theory paper exam was scheduled from 10:30 AM to 1:30 PM. Students were allotted an additional 15 minutes at the start to read the question paper and strategise their answers.Â
Class 10 students who appeared for the exam will be able to check their performance soon by using the CBSE 10 Science Answer Key 2026, which is prepared by subject experts for different sets. Following the exam, students will be provided an analysis of the CBSE Class 10 Science Question Paper, including a detailed breakdown of the difficulty level, student responses, and a comprehensive evaluation of the questions by our subject experts. According to intial review by subject experts, SET 2 was easy. MCQs were very easy, and the paper is scoring
CBSE 10 Science Answer Key 2026 Unofficial (Available)
The CBSE Class 10 Science Exam 2026 will be conducted today for 80 marks. As per the revised pattern,the question paper consists of 39 compulsory questions with approximately 33% internal choice provided within specific questions. The CBSE 10th Science Question Paper includes MCQs, Assertion and Reasoning, Short Answer, Long Answer, and Case-based Questions. Here’s the set-wise CBSE 10 Science Unofficial Answer Key 2026.
SET NO- 31/2/2
| SECTION A- BIOLOGY1. | (C) Asexual reproduction by breaking up of Spirogya filaments into smaller parts |
| 2. | (D) 1:2:1 |
| 3. | (C) Chemotroprism |
| 4. | (D) The Guard Cells Have Swelled Due To Inflow Of Water |
| 5. | (C) Decrease in energy at higher levels |
| 6. | (B) (ii) and (iii) |
| 7. | (B) T5 |
| SECTION B - CHEMISTRY17. | (B) Tartaric Acid |
| 18. | (D) pH falls below 5.6 |
| 19. | (A) i and iii |
| 20. | (C) X - Hydrochloric Acid, Y - Carbon Dioxide |
| 21. | (B) Mg reacts with water to produce H2 gas which helps in floating |
| 22. | (B) The jewellery comes in contact with air, moisture and acids and corrodes. |
| 23. | (C) Green colour of the salt fades and the smell of buring sulphur is evolved |
| 24. | (C) Assertion is True, but Reason is False |
| SECTION - C - PHYSICS1. | (B) Red, Yellow, Green, Blue, Violet |
| 2. | (A) Concave Mirror, Nature of image - real |
SET CODE- 31/2/1
| SECTION A - BIOLOGY1. | (D) 1:2:1 |
| 2. | (C) Chemotroprism |
| 3. | (C) Asexual reproduction by breaking up of Spirogya filaments into smaller parts |
| 4. | (A) Starch |
| 5. | (B) (ii) and (iii) |
| 6. | (B) T5 |
| 7. | (C) Decrease In Energy At Higher Levels |
| 8. | (A) Both Assertion and Reason are true and Reason is correct explanation of Assertion |
| 9. | (A) Both Assertion and Reason are true and reason is the correct explanation of Assertion |
| SECTION - B CHEMISTRY17. | (D) ii and iii |
| 18. | (C) X - Hydrochloric Acid, Y - Carbon Dioxide |
| 19. | (C) Green colour of the salt fades and the smell of buring sulphur is evolved |
| 20. | (B) Mg reacts with water to produce H2 gas which helps in floating |
| 21. | (A) Less than 7 |
| 22. | (C) Sodium Hydrogen Carbonate + Tartaric Acid |
| 23. | (B) The jewellery comes in contact with air, moisture and acids and corrodes. |
| 24. | (A) Both Assertion and Reason are true and reason is the correct explanation of assertion |
| Section - C PHYSICS30. | (A) Concave Mirror, Nature of image - real |
| 31. | (B) Red, Yellow, Green, Blue, Violet |
| 32. | (C) Assertion is True But Reason is False |
| 33. | √3 |
SET CODE - 31/2/3
| Questions | Answers |
|
SECTION - A BIOLOGY 1. |
(A) Starch |
|
2. |
(C) Asexual reproduction by breaking up of Spirogya filaments into smaller parts |
|
3. |
(C) Chemotropism |
|
4. |
(D) 1:2:1 |
|
5. |
(D) |
|
6. |
(C) Decrease in energy at higher levels |
|
7. |
(B) T5 |
|
8. |
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion |
|
9. |
(A) Both Assertion (A) and Reason (R) are true, but Reason (R) is the correct explanation of Assertion |
|
SECTION B - CHEMISTRY 17. |
(C) Oxalyic Acid |
|
18. |
(B) Washing Soda |
|
19. |
(C) i and iii |
|
20. |
(C) X - Hydrochloric Acid, Y - Carbon Dioxide |
|
21. |
(C) Green colour of the salt fades and the smell of buring sulphur is evolved |
|
22. |
(B) The jewellery comes in contact with air, moisture and acids and corrodes. |
|
23. |
(C) Mg reacts with water to produce H2 gas which helps in floating |
|
24. |
(A) Both Assertion and Reason are True and Reason is correct Explanation of Assertion |
|
SECTION - C PHYSICS 30. |
(A) Concave Mirror, Nature of image - real |
|
31. |
(B) Red, Yellow, Green, Blue, Violet |
|
32. |
(B) (A) Both Assertion and Reason are True but Reason is not correct Explanation of Assertion |
SET No. Â - 31/5/1
| Questions | Answers |
|
SECTION A- BIOLOGY 1. |
(C) Guard Cells |
|
2. |
(A) Pituitary Glands |
|
3. |
(D) Glucose → Pyruvate →  Lactic Acid+Energy |
|
4. |
(C) Uterus |
|
5. |
(C) 44 + XY |
|
6. |
(B) DDT |
|
7. |
(B) Break down complex organic substances to simple inorganic substances. |
|
SECTION B - CHEMISTRY 17. |
(B) 2:1 |
|
18. |
(D) C4 H8 and C5 H12 |
|
19. |
(D) Al2O3 |
|
20. |
(D) |
|
21. |
(C) C3H8 |
|
22. |
(D) Hydrochloric acid and sodium hydroxide |
|
23. |
(C) Hydrogen |
|
24. |
(A) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A) |
|
SECTION C - PHYSICS 30. |
(A) 20 CM |
|
31 |
(A) Converging Lens |
|
32 |
(D) Assertion is False Reason is True |
CBSE Class 10 Science Question Paper Analysis 2026
According to the revised pattern, the 10th board Science questions paper is heavily competency-based, with 50% of the marks dedicated to demonstrating knowledge and understanding, 30% for application-based concepts, and 20% for analytical or evaluative tasks. Students can check the overall and section-wise difficulty level of the paper.
| Particulars | Exam Analysis |
| Overall Difficulty Level | Moderate |
| Section A Difficulty Level | Easy |
| Section B Difficulty Level | Easy |
| Section C Difficulty Level | Easy |
| Section D Difficulty Level | Moderate |
| Was The Paper Lengthy? | No |
To pass the CBSE Class 10 Science exam in the 2025-26 session, the official passing percentage is 33%. Students must note that the CBSE 10 Science Answer Key 2026 is for reference purposes only. While it can help you calculate an approximate score, students should wait for the official CBSE results for their final marks.
CBSE Class 10th students who appered for the Maths exam can evaluate their performance through CBSE 10th Maths Answer Key Unofficial 2026 (OUT): Question Paper Difficulty Level
Live Updates
Students who appeared for today’s Class 10th Science exam can check their answers according to their SET Code. Our subject experts have provided set-wise answer keys for student’s reference.
In Calss 10th Science Question Paper 2026, the questions in Chemistry section on Carbon and its Compounds and the Reactivity Series in Metals and Non-Metals were noted as tricky by the students and experts both.
Students appreciated the new structure. Dividing the paper into dedicated segments for Biology (30 marks), Chemistry (25 marks), and Physics (25 marks) helped students manage their time better and reduced confusion between subjects.
Yes, the paper was mostly based on the NCERT syllabus. However, experts noted that almost 50% of the questions were competency-based, meaning students were required to apply concepts to scenarios to be able to answer the question correctly.
- The questions were of Moderate level.
- Today’s science paper was easy and balanced.
- Easy MCQs can help students score well.
- The expected good score of the theory paper is 70+.
According to the subject experts and student's feedback, the MCQs of each section A - Biology, B - Chemistry, and C- Physics were easy. Most of the questions were direct and student's didn't find any diffculty solving any MCQs. Accprding to expert's the CBSE Class 10th Science Paper was more easy than expected.
The Unofficial answer keys of the Class 10th Science Exam from subject experts has been released. Students can match their answers according to their set and calculate their probable scores.
- Ananya Iyer (New Delhi) says, "The Physics section was a bit tricky. The numerals were head-scratching for sure, but the Biology section was quite direct. I’m just glad I finished the Case-Based questions on time!"
- According to Rahul Deshmukh (Pune), "The new subject-wise sectioning really helped. Chemistry was easy, but physics took more time than I expected."
- Ishita Verma from Lucknow says, "I found the Assertion-Reasoning questions in Section A a bit confusing. Overall, the paper was moderate, not too easy, but definitely doable."
According to early reviews by the experts, the class 10th Science exam was of a Moderate difficulty level. The paper is well-balanced, though the Physics numericals and Biology case studies appear to be time-consuming.
Students who solved SET NO- 31/2/2 can now cross-check their answers. The LIVE CBSE Class 10 Science Question Paper solution is ongoing here!
The students are finally coming out of their examination centres. Stay tuned to know about the paper's difficulty level and students’ initial reactions. Most students are expected to discuss the new competency-based questions.
The final bell rang at 1:30 PM sharp, students stopped writing immediately. Invigilators will now begin collecting the answer booklets. Students will be allowed to exit the hall by 1:40 PM after all booklets are collected.
The CBSE Class 10 Science Exam will end in 15 minutes. Invigilators have just given the "final warning" bell. Students are currently doing a final check of their diagrams and chemical equations.
The passing percentage is 33% overall. For a 100-mark total (80 theory + 20 internal), students need a combined score of at least 33 marks.
|
Exam |
Marks |
Passing Marks |
Total Marks |
|
Theory |
80 |
27 |
33 (Out of 100) |
|
Practical |
20 |
7 |
According to the new/revised pattern, approximately 50% of the paper consists of competency-based questions. These include MCQs, Case-Based Studies, and Assertion-Reasoning questions designed to test conceptual clarity over rote memorization.
According to the advisory issued by the CBSE,
- Students must divide the answer book into three sections while writing answers.
- Each section will correspond to a particular group of questions in the question paper.
- Students must write answers only within the space identified for the respective section in the answer book.
- Answers should be written clearly under the correct section heading.
- Answers belonging to one section must not be written in another section.
- If answers are written in the wrong section or mixed across sections, they will not be evaluated and no marks will be awarded.
- Such errors will not be considered even during verification or re-evaluation after the results are declared.
According to the advisory issued by the CBSE,
- Students must divide the answer book into three sections while writing answers.
- Each section will correspond to a particular group of questions in the question paper.
- Students must write answers only within the space identified for the respective section in the answer book.
- Answers should be written clearly under the correct section heading.
- Answers belonging to one section must not be written in another section.
- If answers are written in the wrong section or mixed across sections, they will not be evaluated and no marks will be awarded.
- Such errors will not be considered even during verification or re-evaluation after the results are declared.
Students will encounter different range of question types, including 20 objective-type questions (MCQs and Assertion and Reasoning) in Section A, followed by very short answers (2 marks), short answers (3 marks), case-study/experiment-based questions (4 marks), and long-form descriptive or numerical questions (5 marks) distributed across the three subjects.
The paper is divided into three distinct subject-wise sections:
- Section A: Biology (30 Marks)
- Section B: Chemistry (25 Marks)
- Section C: Physics (25 Marks)
Based on recent trends and expert’s insights, the Class 10th Science paper is expected to be Moderate. While direct NCERT questions are included, according to pattern change there is a higher emphasis on competency-based and application-oriented questions compared to previous years.
The 10th CBSE Board Science exam writing session started at 10:30 AM. Students have started writing their answers in the booklets. The exam is 3 hours long (10:30 AM to 1:30 PM) and carries a maximum of 80 marks. The remaining 20 marks are allocated to internal assessments.
As per the rule, the question papers have been distributed at 10:15 AM. This provides students with a mandatory 15-minute "reading time" to review the questions before they begin writing.
The CBSE Class 10th Science exam is today, February 25, 2026. Here are important guidelines:
- Carry original Admit Card and your own stationery.
- No smartwatches/electronics.
- Ensure neat handwriting, clear headings, and bullet points.
- Utilise the extra 15 minutes wisely
- Double check the roll number on the answer sheet and other details.