The CBSE Class 10 Science exam is one of the most crucial exams for students. It requires thorough preparation, and one effective strategy is to focus on the most frequently asked questions from previous years. While there is no certainty that these exact questions will appear in the CBSE Class 10 Science Exam 2025, they are highly relevant and cover essential concepts from the syllabus.
In this article, we provide a compilation of the most repeated questions from Physics, Chemistry, and Biology. These questions have been selected based on past trends in CBSE exams. Along with these questions, students must also study the entire syllabus to ensure comprehensive preparation.
Read also: AP Inter 1st Year Economics Guess Paper 2025
CBSE Class 10 Science Exam 2025: Most Repeated Questions
Physics: Frequently Asked Questions
Physics is a conceptual subject that requires a deep understanding of principles and laws. Below are four frequently asked questions in CBSE Class 10 Physics:
1. What is a solenoid? What is the difference between a magnetic field pattern of a solenoid and a bar magnet?
A solenoid is a cylindrical coil of wire acting as a magnet when an electric current passes through it. It produces a uniform magnetic field similar to that of a bar magnet.
- Magnetic Field of a Solenoid: The field inside the solenoid is uniform and strong, resembling a bar magnet with distinct north and south poles.
- Difference: Unlike a bar magnet, the magnetic field of a solenoid can be controlled by varying the current, and its poles can be reversed by changing the direction of the current.
2. What are the defects of vision?
The common eye defects include:
- Myopia (Nearsightedness): A person can see nearby objects clearly but has difficulty seeing distant objects. It is corrected using a concave lens.
- Hypermetropia (Farsightedness): A person can see distant objects clearly but struggles with nearby objects. It is corrected using a convex lens.
- Presbyopia: Age-related condition causing difficulty in seeing nearby objects.
- Astigmatism: Uneven curvature of the cornea causes distorted vision and is corrected with cylindrical lenses.
3. Explain Fleming’s Left-Hand Rule and Maxwell’s Right-Hand Thumb Rule.
- Fleming’s Left-Hand Rule: It is used to determine the direction of force experienced by a current-carrying conductor in a magnetic field. The thumb represents force, the index finger represents the magnetic field, and the middle finger represents current.
- Maxwell’s Right-Hand Thumb Rule: It helps determine the direction of the magnetic field around a current-carrying conductor. If the right-hand thumb points in the direction of current, the curled fingers indicate the direction of the magnetic field.
4. State Joule’s Law of Heating and Ohm’s Law.
- Joule’s Law of Heating: The amount of heat produced in a conductor is directly proportional to the square of the current, resistance, and time. It is given by the formula:
H = I²RT, where H is heat, I is current, R is resistance, and T is time. - Ohm’s Law: It states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, provided the temperature remains constant.
V = IR, where R is resistance.
Chemistry: Frequently Asked Questions
Chemistry includes concepts of chemical reactions, bonding, and properties of substances. Below are the most repeated questions in CBSE Class 10 Chemistry:
5. What is a redox reaction? What are the different types of reactions?
A redox reaction is a chemical reaction where oxidation and reduction occur simultaneously.
- Oxidation: Loss of electrons or gain of oxygen.
- Reduction: Gain of electrons or loss of oxygen.
Other types of chemical reactions include: - Combination Reaction – Two or more reactants combine to form a single product.
- Decomposition Reaction – A compound breaks down into simpler substances.
- Displacement Reaction – A more reactive element replaces a less reactive one in a compound.
- Double Displacement Reaction – Exchange of ions between two compounds.
6. What is the functional group of carbon and its compounds? What is a homologous series?
- Functional Group: An atom or a group of atoms in an organic molecule that defines its chemical properties. Examples:
- Alcohol (-OH)
- Aldehyde (-CHO)
- Carboxyl (-COOH)
- Ketone (-CO-)
- Homologous Series: A series of organic compounds having the same functional group, with successive members differing by a CH₂ unit. Example: Alkanes (Methane, Ethane, Propane, etc.).
7. What is micelle formation in water?
Micelles are formed when soap or detergent molecules arrange themselves in water with hydrophobic tails inward and hydrophilic heads outward. This helps in trapping dirt and grease, making them soluble in water for easy cleaning.
Biology: Frequently Asked Questions
Biology involves the study of living organisms and their functions. Here are the most repeated questions in CBSE Class 10 Biology:
8. What is a Reflex Arc?
A reflex arc is the nerve pathway involved in a reflex action. It consists of:
- Receptor: Detects the stimulus.
- Sensory Neuron: Carries impulse to the spinal cord.
- Interneuron: Processes the impulse in the spinal cord.
- Motor Neuron: Sends signals to the effector.
- Effector: Muscle or gland that responds to the stimulus.
Example: The knee-jerk reflex.
9. What is Double Circulation?
Double circulation refers to the two separate circulations in the human body:
- Pulmonary Circulation: Blood flows from the heart to the lungs for oxygenation and back.
- Systemic Circulation: Oxygenated blood is pumped from the heart to the rest of the body.
This ensures efficient oxygen distribution and waste removal.
10. What are Plant Hormones?
Plant hormones are chemical substances that regulate growth and development. The major types include:
- Auxins: Promote cell elongation.
- Gibberellins: Stimulate stem growth and seed germination.
- Cytokinins: Promote cell division.
- Abscisic Acid: Inhibits growth and induces dormancy.
- Ethylene: Promotes fruit ripening.
Conclusion
Preparing for the CBSE Class 10 Science Exam 2025 requires understanding core concepts and frequently asked questions. The above-mentioned most repeated questions from Physics, Chemistry, and Biology will help students focus on key topics while revising. However, students should not rely solely on these questions but study the entire syllabus to be well-prepared.
For more exam updates, important questions, and study materials, keep visiting our website!
CBSE Class 10 Science, CBSE Science Exam 2025, Most Repeated Questions, CBSE Class 10 Physics, CBSE Class 10 Chemistry, CBSE Class 10 Biology, CBSE Important Questions, Science Important Questions, CBSE Board Exam 2025, Class 10 Science Preparation, CBSE Study Material, CBSE Board Exam Tips, Class 10 Science Syllabus, CBSE Exam Preparation,
Disclaimer: The information provided on RozgarVaani.com is for general informational purposes only. While we strive for accuracy, please verify details from official sources. For any queries, contact us at hello@rozgarvaani.com.
