CBSE Class 10 Science Answer Key 2025 and Question Papers, Download PDF All SETs

The CBSE Class 10 Science Paper 2025 exam was conducted today, February 20, 2025. The exam lasted for 3 hours, conducted from 10:30 am to 1:30 pm, with an additional 15 minutes given for reading the question paper. Which consists of a total of 39 questions, divided into sections A, B, C, D and E. 

Here we are providing a detailed analysis of student responses, expert opinions and the difficulty level of the paper including expected good scores, time-consuming section and longest question.

We have shared the CBSE Class 10 Science Question Paper 2025 PDF and answer key to help students check their answers and evaluate their performance. A direct link to download CBSE 10th Science Question Paper 2025 to be avialble on this page.

👉 CBSE Class 10 Science Question Paper 2025 (Set-1) FREE PDF Download

👉 CBSE Class 10 Science Question Paper 2025 (Set-2) FREE PDF Download

👉 CBSE Class 10 Science Question Paper 2025 (Set-3) FREE PDF Download

CBSE Class 10 Science Exam 2025 Student Reviews

The Central Board of Secondary Education successfully conducted the Science exam. Get the question paper analysis of CBSE Class 10 exam for Science here. A brief question paper analysis is as follows:

• The candidates remarked that the question paper was not lengthy.
• The questions were moderately complex.
• All the questions were from the syllabus, among which 70% of the questions were from the textbook itself. 
• MCQs were based on conceptual knowledge, and case-based questions were easy. 
• Students could complete the question paper on time.

CBSE Class 10 Science Paper Analysis 2025

CBSE Class 10 Science Paper Analysis 2025 Based on the first few responses given by the students, the CBSE Class 10 Science Paper Analysis 2025 turned out to be medium and lengthy.

Students can check the table below to get an overview of the CBSE Class 10 Science Paper Analysis 2025.

CBSE Class 10  Science Answer Key 2025

SECTION-A

In this section, Question Nos. 1 to 20 are Multiple-Choice Questions.

1. In the following experimental setup of electrolysis of water, if P and Q are the gases collected in the test tubes enclosing the electrodes R and S, then select the option/options in which the matching is correct:

(i) P-Oxygen gas, R-Anode

(ii) P-Hydrogen gas, R-Cathode

(iii) Q-Hydrogen gas, S-Cathode

(iv) Q-Oxygen gas, S-Anode

(A) (i) and (ii)

(B) (iii) and (iv)

(C) (i) and (iii)

(D) (ii) and (iv)

Answer: (C) (i) and (iii)

Explanation: During the electrolysis process, water breaks down into its constituent gases, hydrogen and oxygen. The positive electrode (anode, R) attracts negatively charged ions (hydroxide ions – OH-) and generates oxygen gas (O2). The negative electrode (cathode, S) attracts positively charged ions (hydrogen ions – H+) and produces hydrogen gas (H2).

2. You have three aqueous solutions A, B and C as given below:

A - Potassium nitrate

B - Ammonium chloride

C - Sodium carbonate

The ascending order of the pH of these solutions is:

(A) A<B<C

(B) B<C<A

(C) C<A<B

(D) B<A<C

Answer: (B) B<C<A

Explanation:

• Ammonium chloride (B) is acidic (pH < 7).
• Potassium nitrate (A) is neutral (pH ~7).
• Sodium carbonate (C) is basic (pH > 7).

3. Select from the following a statement which is not true about burning of magnesium ribbon in air:

(A) It burns with a dazzling white flame.

(B) A white powder is formed on burning.

(C) It is an endothermic reaction.

(D) It is an example of a combination reaction.

Answer: (C) It is an endothermic reaction.

Explanation:

• Burning of magnesium ribbon is an exothermic reaction, as it releases heat and light.
• It burns with a dazzling white flame, forming magnesium oxide (white powder).
• It is a combination reaction because Mg + O₂ → MgO involves the combination of magnesium and oxygen.

4. A Hydrocarbon which does not belong to the same homologous series of carbon compounds is

(A) C₄H₁₀

(B) C₇H₁₄

(C) C₆H₁₄

(D) C₁₀H₂₂

Answer: 

Answer: (B) C₇H₁₄

Explanation:

(A), (C) and (D) belong to the alkane homologous series (C_nH_2n+2) while C₇H₁₄ belongs to the alkene homologous series (C_nH_2n), which is different.

5. The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is

(A) Blue

(B) Pale green

(C) Yellow

(D) Reddish brown

Answer:

6. Juice of tamarind turns blue litmus to red. It is because of the presence of a chemical compound called

(A) Acetic acid

(B) Methanoic acid

(C) Oxalic acid

(D) Tartaric acid

Answer:

7. The water of crystallization is present in

(i) Bleaching Powder

(ii) Plaster of Paris

(iii) Washing Soda

(iv) Baking Soda

(A) (ii) and (iv)

(B) (ii) and (iii)

(C) (i) and (iii)

(D) (i) and (iv)

Answer:

8. A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The F, generation will be

(A) 25% tall with round seeds

(B) 50% tall with wrinkled seeds

(C) 75% tall with wrinkled seeds

(D) 100% tall with round seeds

Answer:

9. A pair of endocrine glands located in the human brain is

(A) Parathyroid and Pituitary

(B) Pineal and Thymus

(C) Hypothalamus and Thymus

(D) Hypothalamus and Pineal

Answer:

10. Select the option having correct matching of the organism given in Column I with the mode of reproduction in Column II:

(A) P-4, Q-2, R-1, S-3

(B) P-3, Q-4, R-5, S-2

(C) P-3, Q-4, R-1, S-2

(D) P-4, Q-3, R-2, S-1

Answer:  (C) P-3, Q-4, R-1, S-2

Explanation:

• Leishmania → Binary Fission (with a longitudinal plane of division)
• Spirogyra → Fragmentation (algae breaking into pieces to grow)
• Planaria → Regeneration (ability to regrow body parts)
• Plasmodium → Multiple Fission (malaria-causing parasite reproduces by multiple fission)

11. The basic filtration unit of the excretory system in human beings is:

(A) Nephron

(C) Neuron

(B) Urethra

(D) Urinary bladder

Answer: (A) Nephron

Explanation: Nephron is the functional unit of the kidney, responsible for filtration and formation of urine.

12. In human alimentary canal, the digestive juice secreted by the gastric glands are

(A) Bile, Trypsin, Pepsin

(B) Hydrochloric acid, Pepsin, Mucus

(C) Lipase, Bile, Mucus

(D) Salivary amylase, Pepsin, Bile

Answer: (B) Hydrochloric acid, Pepsin, Mucus

Explanation:

• Hydrochloric acid (HCl): Creates an acidic environment.
• Pepsin: Enzyme that digests proteins.
• Mucus: Protects the inner lining of the stomach.

More answers are being updated here, stay tuned!