For JAC (Jharkhand Academic Council) Class 10 Science, the first-term syllabus for the 2025-26 academic session typically covers a portion of the NCERT-based syllabus, focusing on foundational topics in Physics, Chemistry, and Biology. Based on the JAC exam pattern and insights from web resources like Jharnet.com, jacboardsolutions.com, and twsmartclasses.com, the first term generally includes chapters 1–6 or similar foundational topics from the NCERT Science textbook. The exam pattern includes 30 marks for objective questions (MCQs), 50 marks for subjective questions (7+7+5 format), and 20 marks for internal assessment/practical exams, totaling 100 marks.
Below is a curated list of important questions for the JAC Class 10 Science first-term exam 2025, covering key chapters like Chemical Reactions and Equations, Acids, Bases and Salts, Metals and Non-Metals, Life Processes, Control and Coordination, and Light – Reflection and Refraction. These questions are based on the JAC syllabus, past papers, and model question banks from sources like JCERT and twsmartclasses.com.
Important Objective Questions (MCQs) for JAC Class 10 Science (First Term 2025)
- Chemical Reactions and Equations
- Q1. Which of the following is an endothermic reaction?
(a) Burning of coal
(b) Decomposition of vegetable matter into compost
(c) Respiration
(d) Decomposition of calcium carbonate to form quicklime and carbon dioxide
Answer: (d) - Q2. What is the role of calcium chloride in a guard tube during the preparation of hydrogen chloride gas on a humid day?
(a) Absorb the emitted gas
(b) Moisten the gas
(c) Absorb moisture from the gas
(d) Absorb chlorine ions from the emitted gas
Answer: (c) - Q3. What is the molecular mass difference in a homologous series?
(a) 12 u
(b) 14 u
(c) 16 u
(d) 18 u
Answer: (b)
- Q1. Which of the following is an endothermic reaction?
- Acids, Bases and Salts
- Q4. An aqueous solution turns red litmus blue. Which solution, when added in excess, will reverse this change?
(a) Baking powder
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric acid
Answer: (d) - Q5. Which of the following is a neutralisation reaction?
(a) Pb + CuCl₂ → PbCl₂ + Cu
(b) Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl
(c) C + O₂ → CO₂
(d) CH₄ + 2O₂ → CO₂ + 2H₂O
Answer: (b)
- Q4. An aqueous solution turns red litmus blue. Which solution, when added in excess, will reverse this change?
- Metals and Non-Metals
- Life Processes
- Light – Reflection and Refraction
- Q10. The image formed by a plane mirror is:
(a) Real
(b) Inverted
(c) Virtual and erect
(d) Magnified
Answer: (c) - Q11. The focal length of a concave mirror is:
(a) Zero
(b) Positive
(c) Negative
(d) None of these
Answer: (c) - Q12. Which mirror can produce a real and inverted image?
(a) Plane mirror
(b) Convex mirror
(c) Concave mirror
(d) Parabolic mirror
Answer: (c) - Q13. The human eye contains which type of lens?
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) None of these
Answer: (a) - Q14. The refractive index is highest for:
(a) Air
(b) Water
(c) Glass
(d) Diamond
Answer: (d)
- Q10. The image formed by a plane mirror is:
Important Subjective Questions for JAC Class 10 Science (First Term 2025)
- Chemical Reactions and Equations (5 Marks)
- Q1. Why is it necessary to balance a chemical equation? Explain with an example of a balanced equation.
Answer: According to the law of conservation of mass, the mass of reactants and products in a chemical reaction must be equal. Balancing ensures the same number of atoms of each element on both sides.
Example: 2H₂ + O₂ → 2H₂O (Hydrogen and oxygen combine to form water, with 4 hydrogen and 2 oxygen atoms balanced on both sides).
- Q1. Why is it necessary to balance a chemical equation? Explain with an example of a balanced equation.
- Acids, Bases and Salts (3 Marks)
- Metals and Non-Metals (5 Marks)
- Q3. Name a moderately reactive metal and describe the three main steps in extracting it from its sulphide ore.
Answer: Metal: Zinc (Zn).
Steps:
(i) Concentration of ore (e.g., froth flotation for zinc blende, ZnS).
(ii) Roasting: Converting sulphide ore to oxide (2ZnS + 3O₂ → 2ZnO + 2SO₂).
(iii) Reduction: Extracting metal from oxide using carbon or electrolysis.
- Q3. Name a moderately reactive metal and describe the three main steps in extracting it from its sulphide ore.
- Life Processes (3 Marks)
- Light – Reflection and Refraction (5 Marks)
- Q5. Draw a ray diagram to show the image formed by a concave mirror when the object is placed at the center of curvature. Explain the nature of the image.
Answer: [Diagram: Object at C, rays parallel to the principal axis reflect through F, and rays through C reflect back, forming an image at C.]
The image is real, inverted, and of the same size as the object. - Q6. What is myopia? How is it corrected?
Answer: Myopia (near-sightedness) is a defect where a person can see nearby objects clearly but not distant ones due to an elongated eyeball or excessive lens curvature. It is corrected using a concave lens.
- Q5. Draw a ray diagram to show the image formed by a concave mirror when the object is placed at the center of curvature. Explain the nature of the image.
Key Chapters for First Term (Based on JAC Syllabus 2025-26)
The first-term syllabus typically includes:
- Chemistry: Chemical Reactions and Equations, Acids, Bases and Salts, Metals and Non-Metals.
- Biology: Life Processes (Nutrition, Respiration, Transportation, Excretion).
- Physics: Light – Reflection and Refraction.
Check the official JAC syllabus at jac.jharkhand.gov.in for exact chapter coverage, as the first term may vary slightly.
Resources for Practice
- JAC 10th Question Bank 2025: Download from jharnet.com or jacexamportal.in for chapter-wise objective and subjective questions.
- JAC Model Papers 2025: Available at jacboardsolutions.com and jnanabhumiap.in, covering Science with answers.
- Previous Years’ Papers: Access last 5 years’ papers (2021–2024) from school.careers360.com for exam pattern familiarity.
- Online Platforms: jacrankers.com offers PDFs with 750 objective questions and chapter-wise notes.
Preparation Tips
- Focus on NCERT: JAC exams are NCERT-based, so master the textbook first.
- Practice MCQs: Solve the 30 objective questions from the JAC Question Bank to ace the objective section.
- Ray Diagrams and Equations: Practice diagrams (e.g., concave mirror) and balance chemical equations for subjective questions.
- Mock Tests: Use model papers from twsmartclasses.com or alamacademycentre.in to simulate the 3-hour exam.
- Revise Key Concepts: Focus on definitions (e.g., neutralisation, excretion) and numericals (e.g., lens formula, focal length).
For specific chapter-wise PDFs or additional questions, visit jacexamportal.in or comment for tailored resources. Good luck with your first-term exams!
Leave a Reply