CBSE 10 Science Set 3 Answer Key 2025 Unofficial: The Central Board of Secondary Education (CBSE) conducted the Class 10 Board Science Exam today, February 20, 2025, from 10:30 AM to 1:30 PM. The exam was for 80 marks, and students were given 3 hours to complete their paper. Students who appeared for the exam and attempted Set 3 can check the CBSE 10 Science Set 3 Answer Key 2025 Unofficial for reference.
The CBSE Class 10 Science Set 3 Unofficial Answer Key 2025 includes answers to the questions in the same order as given in the question paper. The CBSE 10th Set 3 Science Answer Key 2025 is prepared by subject experts and professionals, and students can use it to calculate their overall performance.
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CBSE 10 Science Set 3 Answer Key 2025 Unofficial
The CBSE Class 10 Science Question Paper included Multiple Choice Questions, Short Answer Type Questions I and II, Long Answer Type Questions, and Case-Based Questions in Sections A, B, C, D, and E. Candidates can check the CBSE 10 Science Set 3 Unofficial Answers below.
CBSE Class 10 Science Set 3 Section A Unofficial Answer Key 2025 (QP Code - 31/3/1)
Question Number |
Questions |
CBSE 10 Science Set 3 Answers |
1 |
Consider the following chemical equation : pAl + q H2O → r Al2 O3 + SH2 To balance this chemical equation, the values of 'p', 'a, "r' and 's' must be respectively : |
(C) 2,3,1,3 |
2 |
Which of the given option represents a family of salts? |
(B) K2SO4 , NA2SO4 , CaSO4 |
3 |
The most common method of extraction of metals from their oxide ores iS : |
(A) Reduction with carbon |
4 |
Given below are the structures of some hydrocarbons. Select the two structures which are related to each other from the given options |
C (ii) and (iii) |
5 |
Choose the incorrect statement about the common reaction used in hydrogenation of vegetable oils. |
(D) It is an addition reaction which occurs in the presence of an acid catalyst. |
6 |
Match Column 1 with Column2 |
D |
7 |
The part of the brain which maintains the posture and balance of the body is : |
(C) Cerebellum |
8 |
The plant hormone present in greater concentration in the areas of rapidly dividing cells is : |
(B) Cytokinins |
9 |
Select a pair of bisexual flowers from the following : |
(B) Hibiscus and mustard |
10 |
The gastric glands present in the wall of the stomach release : |
(C) Mucus and Pepsin |
11 |
11: Absolute refractive index of water and glass is 4/3 and 3/2 respectively. If the speed of light in glass is 2 x 108 m/s, the speed of light in water is : |
(A) 9/4 ms |
12 |
When a beam of white light passes through a region of very fine dust particles, the colour of light that scatters the most in that region is : |
(C) Blue |
13 |
A wire of length 'l' is gradually stretched so that its length increases to 3l. If its original resistance is R, then its new resistance will be: |
(C) 9R |
14 |
Which one of the following statements is not true about a bar magnet ? |
(D)The direction of magnetic field lines inside a bar magnet is from its north pole to its south pole. |
15 |
The strength of magnetic field produced inside a long straight current carrying solenoid does not depend upon : |
(B) Direction of current flowing through the solenoid |
16 |
Other than the abiotic components, which of the given biotic components are not required to make an aquarium with small herbivorous fishes a self-sustaining system ? |
D (ii) and (IV) |
17 |
Assertion (A) : Hydrogen gas is not evolved when a metal reacts with nitric acid. Reason (R) : Nitric acid is a strong reducing agent and reduces the hydrogen produced in the reaction to water. |
C |
18 |
(A) : In our actions of writing or talking, our nervous system communicates with the muscles. Reason (R) : Cranial nerves and spinal nerves form the peripheral nervous system. |
B |
19 |
Assertion (A) : Magnetic field lines around a bar magnet never intersect each other. Reason (R) : Magnetic field produced by a bar magnet is a quantity that has both magnitude and direction. |
B |
20 |
Assertion (A) Use of jute bags for shopping reduces pollution Reason (R) : Jute is biodegradable and its bag may be reused as and when needed. |
A |
By using this answer key, candidates can cross their responses and allot marks for every correct answer, as mentioned in the question paper. This will give students an idea of their performance and an estimate of their probable marks. The CBSE 10 Science Exam is 100 marks, and the practical exam carries the remaining 20 marks.
CBSE Class 10 Subject-Wise Answer Key 2025
Subject |
Answer Key |
English |
CBSE Class 10 English Answer Key 2025: Detailed Solutions PDF Download |
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