Science Stream Objective Questions

Oct 13, 2025 by wbrum.org 66 views

Introduction

The Jharkhand Academic Council (JAC) is responsible for conducting the Class 12th board examinations in the state of Jharkhand. The board provides a comprehensive curriculum for students to follow, and the objective questions play a crucial role in assessing their understanding of the subject matter. In this article, we will provide a comprehensive guide to the Class 12th JAC Board Objective Question 2025, covering the science stream.

Science Stream Objective Questions

The science stream includes three main subjects: Physics, Chemistry, and Biology. Each subject has a set of objective questions that are designed to test the student's understanding of the concepts and principles. Here are some of the key topics and objective questions for each subject:

Physics

Mechanics
- What is the unit of measurement for force in the International System of Units (SI)?
  - Answer: Newton (N)
- What is the concept of inertia in physics?
  - Answer: Inertia is the tendency of an object to resist changes in its motion.
- What is the formula for calculating the acceleration of an object?
  - Answer: a = Δv / Δt
Electromagnetism
- What is the unit of measurement for electric current in the International System of Units (SI)?
  - Answer: Ampere (A)
- What is the concept of electromagnetic induction?
  - Answer: Electromagnetic induction is the production of an electromotive force (EMF) across an electrical conductor in a changing magnetic field.
- What is the formula for calculating the resistance of a conductor?
  - Answer: R = V / I
Optics
- What is the unit of measurement for the focal length of a lens in the International System of Units (SI)?
  - Answer: Meter (m)
- What is the concept of total internal reflection?
  - Answer: Total internal reflection is the phenomenon where a light wave is completely reflected back into the same medium when it hits a boundary at a shallow angle.
- What is the formula for calculating the magnification of a lens?
  - Answer: M = -di/do

Chemistry

Physical Chemistry
- What is the unit of measurement for the molar mass of a substance in the International System of Units (SI)?
  - Answer: Gram per mole (g/mol)
- What is the concept of the ideal gas law?
  - Answer: The ideal gas law is a mathematical relationship between the pressure, volume, and temperature of a gas.
- What is the formula for calculating the molar concentration of a solution?
  - Answer: M = n / V
Organic Chemistry
- What is the unit of measurement for the boiling point of a substance in the International System of Units (SI)?
  - Answer: Kelvin (K)
- What is the concept of the reaction mechanism?
  - Answer: The reaction mechanism is the step-by-step process by which a chemical reaction occurs.
- What is the formula for calculating the rate constant of a reaction?
  - Answer: k = ln([A]0 / [A]t) / t
Inorganic Chemistry
- What is the unit of measurement for the pH of a solution in the International System of Units (SI)?
  - Answer: pH is a dimensionless quantity
- What is the concept of the acid-base equilibrium?
  - Answer: The acid-base equilibrium is the balance between the concentrations of hydrogen ions and hydroxide ions in a solution.
- What is the formula for calculating the pOH of a solution?
  - Answer: pOH = -log10[OH-]

Biology

Botany
- What is the unit of measurement for the height of a plant in the International System of Units (SI)?
  - Answer: Meter (m)
- What is the concept of photosynthesis?
  - Answer: Photosynthesis is the process by which plants convert light energy into chemical energy.
- What is the formula for calculating the rate of photosynthesis?
  - Answer: Rate of photosynthesis = (ΔO2 / Δt) / (ΔCO2 / Δt)
Zoology
- What is the unit of measurement for the mass of an animal in the International System of Units (SI)?
  - Answer: Kilogram (kg)
- What is the concept of the food chain?
  - Answer: The food chain is the sequence of organisms that eat other organisms as their source of energy.
- What is the formula for calculating the energy transfer in a food chain?
  - Answer: Energy transfer = (ΔE / Δt) / (ΔE / Δt)

Tips and Strategies for Solving Objective Questions

Here are some tips and strategies that can help you solve objective questions:

Read the question carefully: Make sure you understand what the question is asking before attempting to solve it.
Use the process of elimination: Eliminate any options that are clearly incorrect, and then focus on the remaining options.
Use your knowledge of the subject: Draw on your knowledge of the subject to help you solve the question.
Use formulas and equations: Use formulas and equations to help you solve the question.
Practice, practice, practice: The more you practice, the better you will become at solving objective questions.

Conclusion

Solving objective questions is an essential part of the Class 12th JAC Board examination. By following the tips and strategies outlined in this article, you can improve your chances of success. Remember to read the question carefully, use the process of elimination, use your knowledge of the subject, use formulas and equations, and practice, practice, practice. Good luck with your examination!

References

Jharkhand Academic Council. (2025). Class 12th Board Examination Syllabus.
Jharkhand Academic Council. (2025). Class 12th Board Examination Question Paper.
Khan Academy. (n.d.). Physics, Chemistry, and Biology.
Wikipedia. (n.d.). Jharkhand Academic Council.
Class 12th JAC Board Objective Question 2025: Q&A =====================================================

Q&A Introduction

The Class 12th JAC Board Objective Question 2025 is a crucial examination for students in the state of Jharkhand. In this article, we will provide a comprehensive Q&A section to help students prepare for the examination. Here are some frequently asked questions and answers related to the Class 12th JAC Board Objective Question 2025.

Q&A Section

Physics

Q: What is the unit of measurement for force in the International System of Units (SI)? A: The unit of measurement for force in the International System of Units (SI) is Newton (N).

Q: What is the concept of inertia in physics? A: Inertia is the tendency of an object to resist changes in its motion.

Q: What is the formula for calculating the acceleration of an object? A: The formula for calculating the acceleration of an object is a = Δv / Δt.

Q: What is the unit of measurement for electric current in the International System of Units (SI)? A: The unit of measurement for electric current in the International System of Units (SI) is Ampere (A).

Q: What is the concept of electromagnetic induction? A: Electromagnetic induction is the production of an electromotive force (EMF) across an electrical conductor in a changing magnetic field.

Q: What is the formula for calculating the resistance of a conductor? A: The formula for calculating the resistance of a conductor is R = V / I.

Chemistry

Q: What is the unit of measurement for the molar mass of a substance in the International System of Units (SI)? A: The unit of measurement for the molar mass of a substance in the International System of Units (SI) is Gram per mole (g/mol).

Q: What is the concept of the ideal gas law? A: The ideal gas law is a mathematical relationship between the pressure, volume, and temperature of a gas.

Q: What is the formula for calculating the molar concentration of a solution? A: The formula for calculating the molar concentration of a solution is M = n / V.

Q: What is the unit of measurement for the boiling point of a substance in the International System of Units (SI)? A: The unit of measurement for the boiling point of a substance in the International System of Units (SI) is Kelvin (K).

Q: What is the concept of the reaction mechanism? A: The reaction mechanism is the step-by-step process by which a chemical reaction occurs.

Q: What is the formula for calculating the rate constant of a reaction? A: The formula for calculating the rate constant of a reaction is k = ln([A]0 / [A]t) / t.

Biology

Q: What is the unit of measurement for the height of a plant in the International System of Units (SI)? A: The unit of measurement for the height of a plant in the International System of Units (SI) is Meter (m).

Q: What is the concept of photosynthesis? A: Photosynthesis is the process by which plants convert light energy into chemical energy.

Q: What is the formula for calculating the rate of photosynthesis? A: The formula for calculating the rate of photosynthesis is Rate of photosynthesis = (ΔO2 / Δt) / (ΔCO2 / Δt).

Q: What is the unit of measurement for the mass of an animal in the International System of Units (SI)? A: The unit of measurement for the mass of an animal in the International System of Units (SI) is Kilogram (kg).

Q: What is the concept of the food chain? A: The food chain is the sequence of organisms that eat other organisms as their source of energy.

Q: What is the formula for calculating the energy transfer in a food chain? A: The formula for calculating the energy transfer in a food chain is Energy transfer = (ΔE / Δt) / (ΔE / Δt).

Conclusion

The Class 12th JAC Board Objective Question 2025 is a challenging examination that requires students to have a thorough understanding of the subject matter. By referring to this Q&A section, students can gain a better understanding of the concepts and formulas that are relevant to the examination. Remember to practice regularly and seek help from teachers or classmates if you need it.

References

Jharkhand Academic Council. (2025). Class 12th Board Examination Syllabus.
Jharkhand Academic Council. (2025). Class 12th Board Examination Question Paper.
Khan Academy. (n.d.). Physics, Chemistry, and Biology.
Wikipedia. (n.d.). Jharkhand Academic Council.