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CBSE Class 10 Science Answer Key 2023
In this article, we will discuss the CBSE Class 10 Science Answer Key 2023 and how it can be downloaded in PDF format. The CBSE Class 10 Science Answer Key 2023 is an important document for students who have appeared for the CBSE Class 10 Science Board Exam. With this answer key, students can cross-check their answers and get an idea about their performance in the exam.
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In this article, we will provide a step-by-step guide on how to download the CBSE Class 10 Science Answer Key 2023 in PDF format.
Steps to Download CBSE Class 10 Science Answer Key 2023 in PDF format?
- Step 1: Go to the official website of CBSE, i.e. cbse.gov.in.
- Step 2: Click on the ‘Examinations’ tab on the homepage.
- Step 3: Select the ‘Examination Related Materials’ option from the drop-down menu.
- Step 4: Click on the ‘Answer Keys’ option.
- Step 5: Select ‘Secondary School Examination (Class X) – 2023’ from the list of exams.
- Step 6: Click on the ‘Science’ subject.
- Step 7: The answer key will be displayed in PDF format.
- Step 8: Click on the ‘Download’ button to save the answer key in PDF format.
CBSE Class 10 Science Answer Key 2023 – Overview
| Exam Conducting Body | Central Board of Secondary Education |
|---|---|
| Exam Name | CBSE Class 10 Science |
| Category | Answer Key |
| Science Class 10 Exam Date | 04th March 2023 |
| Science Class 10 Answer Key | 04th March 2023 (Unofficial) |
| Official Website | (not specified) |
Key Points
- CBSE Class 10 Science Board Exam held on March 4, 2023.
- Class 10 Science Answer Key 2023 available for students and parents to check their performance.
- Answer Key discussed in detail by expert faculty.
- Authentic and explained answers provided for each question.
- Science Class 10 Exam analysis started by faculty.
- Difficulty level of the Science Exam Paper was easy to moderate.
- CBSE Class 10 Science Answer Key and Question Paper Solution available.
- Students can refer to the accurate and detailed Science Class 10 Answer Key 2023 and question paper solution.
- Official website of CBSE is https://www.cbse.nic.in/ .
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Importance of CBSE Class 10 Science Answer Key 2023
The CBSE Class 10 Science Answer Key 2023 is an important document for students as it helps them to evaluate their performance in the exam. By checking their answers against the answer key, students can identify their strengths and weaknesses and prepare accordingly for their future exams. The answer key also provides students with an idea about the marking scheme and the distribution of marks for each question, which can help them to score better in their future exams.
CBSE Class 10 Science Answer Key 2023 (Set – 3)
1. When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separates out. The chemical equation for the reaction involved is:
(a) KI+PbNO3 –> PbI + KNO3
(b) 2KI+Pb(NO3)2 –> PbI2 + 2KNO3
(c) KI+PbNO3)2 –> PbI + KNO3
(d) KI+PbNO3 –> PbI2 + KNO3
Answer: (b) 2KI+Pb(NO3)2 –> PbI2 + 2KNO3
2. When Sodium bicarbonate reacts with dilute hydrochloric acid, the gas evolved is:
(a) Hydrogen; it gives pop sound with burning match stick.
(b) Hydrogen; it turns lime water milky.
(c) Carbon dioxide; it turns lime water milky.
(d) Carbon dioxide; it blows off a burning match stick with a pop sound.
Answer: (c) Carbon dioxide; it turns lime water milky.
3. Acid present in tomato is:
(a) Methanoic acid
(b) Acetic Acid
(c) Lactic acid
(d) Oxalic acid
Answer: (d) Oxalic acid
4. A metal ribbon ‘X’ burns in oxygen with a dazzling white flame forming a white ash ‘Y’. The correct description of X, Y and the type of reaction is:
(a) X=Ca;Y=CaO; Type of Reaction = Decomposition
(b) X=Mg;Y=MgO; Type of Reaction = Combination
(c) X=Al;Y=Al2O; Type of Reaction = Thermal Decomposition
(d) X=Zn;Y=ZnO; Type of Reaction = Endothermic
Answer: (b) X=Mg;Y=MgO; Type of Reaction = Combination
5. The name of the salt used to remove permanent hardness of water is:
(a) Sodium hydrogen carbonate (NaHCO3)
(b) Sodium chloride (NaCl)
(c) Sodium carbonate decahydrate (Na2CO3.10H20)
(d) Calcium sulphate hemihydrate (CaSO4.1/2H20)
Answer: (c) Sodium carbonate decahydrate (Na2CO3.10H20)
6. The electron dot structure of chlorine molecule is:
Answer: (c)
7. Sodium hydroxide is termed an alkali while Ferric hydroxide is not because:
(a) Sodium hydroxide is a strong base, while Ferric hydroxide was weak base.
(b) Sodium hydroxide is a base, which is soluble in water while Ferric hydroxide is also a base but it is not soluble in water.
(c) Sodium hydroxide is a strong base while Ferric hydroxide is strong acid
(d) Sodium hydroxide and Ferric hydroxide both are strong base but the solubility of Sodium hydroxide in water is comparatively higher than that of Ferric hydroxid.
Answer: (b) Sodium hydroxide is a base, which is soluble in water while Ferric hydroxide is also a base but it is not soluble in water.
8. Opening and closing of stomata is due to:
(a) High pressure of gases inside the cells.
(b) Movement of water in and out of the guard cells
(c) Stimulus of light in the guard cells
(d) Diffusion of CO2 in and out of the guard cells
Answer: (b) Movement of water in and out of the guard cells
9. Water in the root enters due to:
(a) the function of the root to absorb water.
(b) difference in the concentration of ions between the root and the soil.
(c) excess water present in the soil
(d) diffusion of water in the roots.
Answer: (b) difference in the concentration of ions between the root and the soil.
10. Which one of the given statements is incorrect:
(a) DNA has the complete information for a particular characteristic
(b) DNA is the molecule responsible for the inheritance of characters from parents to offsprings
(c) Change in information will produce a different protein.
(d) Characteristics will remain the same even if protein changes
Answer: (d) Characteristics will remain the same even if protein changes
11. Sensory nerve of a reflex arc carries information from the receptor cells to the:
(a) spinal cord
(b) brain
(c) muscles of the effector organ
(d) bones of the receptor organ
Answer: (a) spinal cord
12. A cross between pea plant with white flowers (vv) and pea plant with violet flowers (VV) resulted in F2 progeny in which ratio of violet (VV) and white (vv) flowers will be:
(a) 1:1
(b) 2:1
(c) 3:1
(d) 1:3
Answer: (c) 3:1
13. The correct pattern of magnetic field lines of the field produced by a current carrying circular loop is:
Answer: (c)
14. Two LED bulbs of 12W and 6W are connected in series. If the current through 12W bulb is 0.006A, the current through 6W bulb will be:
(a) 0.04A
(b) 0.06A
(c) 0.08A
(d) 0.12A
Answer:
15. An alpha particle enters a uniform magnetic field as shown.
The direction of motion of the alpha particle is:
(a) towards right
(b) towards left
(c) into the page
(d) out of the page
Answer:
16. The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become:
(a) four times
(b) two times
(c) half
(d) one fourth
Answer: (b) two times
Q. no 17 to 20 are Assertion – Reasoning based questions.
These consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true and R is not the correct explanation of A
(c) A is true but R is false
(d) A is False but R is true
17. Assertion (A): In humans, if gene (B) is responsible for black eyes and gene (b) is responsible for brown eyes, then the colour of eyes of the progeny having gene combination Bb, bb or BB will be black only.
Reason (R): The black colour of the eyes is a dominant trait.
Answer: (a) Both A and R are true and R is the correct explanation of A
18. Assertion (A): Reaction oif quicklime with water is an endothermic reaction.
Reason (R): Quicklime reacts vigrously with water releasing a large amount of heat.
Answer: (a) Both A and R are true and R is the correct explanation of A
19. Assertion (A): A current carrying straight conductor experiences a force when placed perpendicular to the direction of magnetic field.
Reason (R): The net charge on a current carrying conductor is always zero.
Answer: (b) Both A and R are true and R is not the correct explanation of A
20. Assertion (A): The inner walls of the small intestine have finger like projections called villi which are rich in blood.
Reason (R): These villi have a large surface area to help the small intestine in completing the digestion of food.
Answer: (a) Both A and R are true and R is the correct explanation of A
Note: Our experts are working on the next solutions, therefore students are suggested to keep refreshing this page for more answers for the CBSE Class 10 Science Question Paper 2023.
CBSE Class 10 Science Board Exam Pattern
The CBSE Class 10 Science Board Exam consists of two sections – Section A and Section B. Section A comprises of objective-type questions (multiple-choice questions, fill in the blanks, and assertion-reasoning type questions) while Section B comprises of subjective-type questions. The total marks for the exam are 80, out of which Section A carries 35 marks and Section B carries 45 marks. The duration of the exam is 3 hours.
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Tips to Score Well in CBSE Class 10 Science Board Exam
- Understand the concepts thoroughly: Before attempting any question, it is important to understand the underlying concepts. This will help you to solve the questions quickly and accurately.
- Practice previous years’ question papers: Practicing previous years’ question papers will give you an idea about the type of questions that are asked in the exam and the marking scheme.
- Focus on important topics: Some topics carry more weightage than others. It is important to identify these topics and focus on them while preparing for the exam.
- Make notes: Making notes while studying can help you to revise quickly before the exam.
- Manage your time effectively: Time management is crucial while attempting the exam. Divide your time between Section A and Section B and attempt the questions accordingly.
Conclusion
In this article, we have discussed the CBSE Class 10 Science Answer Key 2023 and how it can be downloaded in PDF format. We have also highlighted the importance of the answer key and provided some tips to score well in the CBSE Class 10 Science Board Exam. By following these tips and using the answer key effectively, students can perform well in the exam and score good marks.
FAQS
Where can students and parents access the Class 10 Science Answer Key 2023?
The Class 10 Science Answer Key 2023 is available for students and parents to check their performance. It can be accessed by connecting with the expert faculty who discussed the answer key or by visiting the official website of CBSE.
When was the CBSE Class 10 Science Board Exam held?
The CBSE Class 10 Science Board Exam was held on March 4, 2023.
Is the CBSE Class 10 Science Answer Key and Question Paper Solution available?
Yes, the CBSE Class 10 Science Answer Key and Question Paper Solution is available. Students can refer to the accurate and detailed Science Class 10 Answer Key 2023 and question paper solution provided by expert faculty.
Who provides the authentic and explained answers in the Class 10 Science Answer Key 2023?
The authentic and explained answers in the Class 10 Science Answer Key 2023 are provided by the expert faculty who discussed the answer key.
