CBSE Class 10 Science Answer Key 2024 (Available): Detailed solutions PDF
Students can access CBSE Class 10 Science Answer Key 2024 here and evaluate their tentative marks in the March 2 examination. The answer key is provided for all the objective-type questions.
CBSE Class 10 Science Answer Key 2024: The examination for Science subject concluded today, March 2, 2024, at 1:30 PM and CBSE Class 10 Science Answer Key 2024 will shortly be updated here. Only answers to the objective questions will be provided. Hence, candidates will only be able to check the answers to Section A: Part A and Part B here. Section A Part A comprises 16 multiple choice questions, and Section A Part B comprises 4 assertion-based questions, all carrying one mark each. The rest of the paper is subjective, and hence answers to the same will vary based on the student’s writing style. Therefore, answers to the other sections will not be made available on this page.
Also Read| CBSE Class 10 Result Expected Release Date 2024
Note: CBSE 10th Science Answer Key 2024 are available for QP Code: 31/3/1 (Set 1), QP Code: 31/5/3 (Set 3), and QP Code: 31/1/1 (Set 1).
CBSE Class 10 Science Answer Key 2024 for QP Code: 31/3/1 (Set 1)
The answers to Section A's objective questions are available for CBSE Class 10 students below.
CBSE Class 10 Science Answer Key 2024 Set 31/3/1: Section A Part A: Multiple-Choice Questions
The answers to the 16 MCQs from CBSE 10th Science Set 31/3/1 are as follows:
Sub Question Number | QP Code: 31/3/1 (Set 1) |
1. Identify the product 'X' obtained in the following chemical reaction: CaCO3 → X + CO2 | (A) Quick lime |
2. Select a pair of natural indicator from the following: | (A) Litmus and methyl orange |
3. A chemical compound used in glass, soap and paper industries is | (A) Washing Soda |
4. The structural formula of Cyclohexane is | (B) |
5. Consider the following Chemical equation : | (A) 1, 6, 2 and 3 |
6. Which one of the following hydrocarbons is different from the others? | (B) C7H14 |
7. Which one of the following reactions is different from the remaining three? | (B) CaO + H2O → Ca(OH)2 |
8. Select from the following a plant hormone which promotes cell division? | (D) Cytokinins |
9. Part(s) of a flower which attracts insects for pollination is (are) | (C) Petals only |
10. In an experiment to study independent inheritance of two separate traits: shape and colour of seeds, the ratio of the different combinations in F2 progeny would be | (C) 9:3:3:1 |
11. Which of the following statement (s) is (are) true about human heart? | (C) (b) and (c) |
12. A cross between two tall pea plants resulted in offsprings having a few dwarf plants. The gene-combination of the parental plants must be | (A) Tt and Tt |
13. The Phenomena of light involved in the formation of a rainbow in the sky are | (B) Refraction, dispersion and total internal reflection |
14. In case of four wires of same material, the resistance will be minimum if the diameter and length of the wire respectively are | (A) D/2 and L/4 |
15. A food chain will be more advantageous in terms of energy if it has | (A) 2 trophic levels |
16. Consider the following statements about ozone : | (B) (a) and (c) |
CBSE Class 10 Science Answer Key 2024 Set 31/3/1: Section A Part B: Assertion-Reason Questions
The answers to the 4 assertion-reason questions from CBSE 10th Science Set 31/5/3 are as follows:
Sub Question Number | QP Code: 31/3/1 (Set 1) |
1. Assertion (A): A piece of Zinc metal gets reddish brown coating when kept in copper sulphate solution for some time. | (C) Assertion (A) is true, but Reason (R) is false. |
2. Assertion (A) : Offsprings produced by asexual reproduction are genetically similar to the parents. | (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). |
3. Assertion (A) : Red light signals are used to stop the vehicles on the road. | (C) Assertion (A) is true, but Reason (R) is false. |
4. Assertion (A) : The waste we generate daily may be biodegradable or non-biodegradable. | (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). |
CBSE Class 10 Science Answer Key 2024 for QP Code: 31/5/3 (Set 3)
The answers to Section A's objective questions are available for CBSE Class 10 students below.
CBSE Class 10 Science Answer Key 2024 Set 31/5/3: Section A Part A: Multiple-Choice Questions
The answers to the 16 MCQs from CBSE 10th Science Set 31/1/1 are as follows:
Sub Question Number | QP Code: 31/5/3 (Set 3) |
1. Select from the following the conditions responsible for the rapid spread of bread mould on a slice of bread: | (A) (i) and (ii) |
2. The incorrect statement about placenta is: | (C) It has a very small surface area for glucose and oxygen to pass from mother to the embryo. |
3. An aqueous solution 'A' turns phenolphthalein solution pink. When another aqueous solution 'B' is added to the pink solution, the pink colour disappears. Now when a few drops of solution 'A' are added to this reaction, the mixture appears pink again. The respective changes in the nature of the solution are from: | (D) basic → acidic → basic |
4. The correct sequence of events when someone's hand touches a hot object unconsciously: | (C) Receptors in skin → Sensory neuron → Relay neuron → Motor neuron → Effector muscle in arm |
5. To balance the following chemical equation, the values of the coefficients x, y and z must be respectively: | (C) 2, 2, 4 |
6. Which of the following is a redox reaction, but not a combination | (D) Fe2O3 + 3CO2 → Fe + 3CO2 |
7. An aqueous solution of sodium chloride is prepared in distilled water. The pH of this solution is : | (C) 7 |
8. A metal 'X' is used in thermit process. When 'X' is heated with oxygen, it gives an oxide 'Y', which is amphoteric in nature. 'X' and 'Y' respectively are: | (B) Al, Al2O3 |
9. The process in which transport of soluble products of photosynthesis takes place in plants is known as: | (D) Translocation |
10. Sense organ in which olfactory receptors are present is : | (A) Nose |
11. Which one of the following is not a natural ecosystem? | (D) Cropland ecosystem |
12 .A uniform magnetic field exists in the plane of paper as shown in the diagram. In this field, an electron (e-) and a positron (p+) enter as shown. The electron and positron experience forces: | (A) both pointing into the plane of the paper. |
13. How will the image formed by a convex lens be affected, if the upper half of the lens is wrapped with a black paper? | (C) The brightness of the image will reduce. |
14. The phenomena of light involved in the formation of rainbow are : | (C) Reflection, dispersion and internal reflection |
15. The colour of light for which the refractive index of glass is minimum, is: | (A) Red |
16. The current carrying device which produces a magnetic field similar to that of a bar magnet is : | (C) A solenoid |
CBSE Class 10 Science Answer Key 2024 Set 31/5/3: Section A Part B: Assertion-Reason Questions
The answers to the 4 assertion-reason questions from CBSE 10th Science Set 31/5/3 are as follows:
Sub Question Number | QP Code: 31/5/3 (Set 3) |
17. Assertion (A): Electrons move from lower potential to higher potential in a conductor. | (D) Assertion (A) is false, but Reason (R) is true. |
18. Assertion (A): Some vegetable oils are healthy. | (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). |
19. Assertion (A): Sex of the children will be determined by what they inherit from their mother. | (D) Assertion (A) is false, but Reason (R) is true. |
20. Assertion (A): Green plants trap only 1% of the energy of sunlight that falls on their leaves. | (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). |
CBSE Class 10 Science Answer Key 2024 for QP Code: 31/1/1 (Set 1)
The answers to Section A's objective questions are available for CBSE Class 10 students below.
CBSE Class 10 Science Answer Key 2024 Set 31/1/1: Section A Part A: Multiple-Choice Questions
The answers to the 16 MCQs from CBSE 10th Science Set 31/1/1 are as follows:
Sub Question Number | QP Code: 31/1/1 (Set 1) |
(i) When 2 mL of sodium hydroxide solution is added to few pieces of granulated zinc in a test tube and then warmed, the reaction that occurs can be written in the form of a balanced chemical equation as : | (b) 2NaOH + Zn → Na2ZnO2 + H2 |
(ii) Select from the following a decomposition reaction in which source of energy for decomposition is light : | (d) CaCO3 → CaO + CO2 |
(iii) A metal and a non-metal that exists in liquid state at the room temperature are respectively: | (c) Mercury and Bromine |
(iv) Carbon compounds: | (c) (ii) and (iv) |
(v) Consider the following compounds : FeSO4; CuSO4; CaSO4; Na2CO3 | (d) Na2CO3 |
(vi) Oxides of aluminium and zinc are: | (c) amphoteric |
(vii) MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 | (d) MnO2 is reduced and HCl is oxidised. |
(viii) Consider the following statements: | (b) (ii) and (iv) |
(ix) Chromosomes : | (d) (i), (ii), and (iv) |
(x) In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as: | (a) Axon |
(xi) A stomata closes when : | (c) (ii) and (iii) |
(xii) At what distance from a convex lens should an object be placed to get an image of the same size as that of the object on a screen? | (c) At twice the focal length of the lens. |
(xiii) The lens system of human eye forms an image on a light sensitive screen, which is called as: | (d) Retina |
(xiv) The pattern of the magnetic field produced inside a current carrying solenoid is : | (a) parallel straight lines |
(xv) Identify the food chain in which the organisms of the second trophic level are missing: | (c) Tiger, grass, snake, frog |
(xvi) In which of the following organisms, multiple fission is a means of asexual reproduction? | (d) Plasmodium |
CBSE Class 10 Science Answer Key 2024 Set 31/1/1: Section A Part B: Assertion-Reason Questions
The answers to the 4 assertion-reason questions from CBSE 10th Science Set 31/1/1 are as follows:
Sub Question Number | QP Code: 31/1/1 (Set 1) |
(i) Assertion (A): Hydrogen gas is not evolved when zinc reacts with nitric acid. | (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). |
(ii) Assertion (A): Accumulation of harmful chemicals is maximum in the organisms at the highest trophic level of a food chain. | (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). |
(iii) Assertion (A): The rate of breathing in aquatic organisms is much faster than in terrestrial organisms. | (c) Assertion (A) is true, but Reason (R) is false. |
(iv) Assertion (A): The rainbow is a natural spectrum of sunlight in the sky. | (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). |
CBSE Class 10 Science 2024: Analysis and Question Paper
The analysis and question paper for CBSE 10th Science held on March 2, 2024, can be checked at the following links:
CBSE Class 10 Answer Key 2024 Links |
The answer keys for the respective day-wise exams are available at the links below:
Subject | CBSE 10th Answer Key 2024 Link |
Computer Applications | CBSE 10th Computer Applications Answer Key 2024 |
Information Technology | CBSE 10th Information Technology Answer Key 2024 |
Mathematics | CBSE 10th Mathematics Answer Key 2024 |
Social Science | CBSE Class 10 Social Science (SST) Answer Key 2024 |
English | CBSE Class 10 English Answer Key 2024 |
Hindi Course A | CBSE Class 10 Hindi (Course A) Answer Key 2024 |
Hindi Course B | CBSE 10th Hindi Course B Answer Key 2024 |
CBSE Class 10 2024 Weightage Subject-Wise |
Access CBSE Class 10 weightage 2024 for the upcoming papers here in the given table:
Keep visiting CollegeDekho for the latest Education News on entrance exams, board exams and admissions. You can also write to us at our email ID news@collegedekho.com.