CBSE Class 10 Exam 2026 - Science Most Repeated Questions Download PDF

CBSE Class 10 Science Exam Pattern 2025

Before moving to the repeated question, let’s first have a look at the exam pattern of CBSE class 10 science.

Section-wise Marks Distribution

Additional Information:

• Reading Time: 15 minutes before writing the exam.

• Marking Scheme: No negative marking; attempt all questions.

• Focus: Conceptual understanding and practical applications.

Repeated Questions from CBSE Class 10 Science (2018-2023)

MCQs

Q1. What is the formula for calculating the speed of an object?

A) Speed = Distance × Time

B) Speed = Distance / Time

C) Speed = Time / Distance

D) Speed = Distance + Time

[Years Appeared: 2019, 2022]

Q2. Which of the following is a non-metal that conducts electricity

A) Sulfur

B) Chlorine

C) Graphite

D) Nitrogen

[Years Appeared: 2020, 2021]

Q3. What is the SI unit of electric resistance?

A) Ampere

B) Volt

C) Ohm

D) Watt

[Years Appeared: 2021, 2023]

Q4. Which gas is released when zinc reacts with hydrochloric acid?

A) Oxygen

B) Nitrogen

C) Hydrogen

D) Carbon dioxide

[Years Appeared: 2019, 2020]

Q5. Which of the following is not a type of chemical bond?

A) Ionic Bond

B) Covalent Bond

C) Metallic Bond

D) Gravitational Bond

[Years Appeared: 2022, 2023]

Q6. What is Ohm’s Law?

A) V = IR

B) V = I²R

C) I = V/R

D) R = VI

[Years Appeared: 2020, 2021]

Q7. Which of the following is a unit of electric current?

A) Volt

B) Ampere

C) Ohm

D) Watt

[Years Appeared: 2021, 2023]

Q8. Which is not a type of chemical bond?

A) Ionic

B) Covalent

C) Metallic

D) Gravitational

[Years Appeared: 2022, 2023]

Q9. Which is not a type of chemical bond?

A) Ionic

B) Covalent

C) Metallic

D) Gravitational

[Years Appeared: 2022, 2023]

Q10. What is pH?

A) Hydrogen ion concentration

B) Measure of acidity or alkalinity

C) Both A & B

D) None of the above

[Years Appeared: 2019, 2022]

Q11. Which of the following is a method of asexual reproduction in plants?

A) Pollination

B) Budding

C) Fertilization

D) None of the above

[Years Appeared: 2020, 2023]

Q12. Which of the following is not a type of respiration?

A) Aerobic

B) Anaerobic

C) Fermentation

D) Both A and B

[Years Appeared: 2020, 2022]

Short Questions

Q1. Explain the process of photosynthesis. [Years Appeared: 2018, 2021]

Q2. State the laws of reflection. [Years Appeared: 2019, 2022]

Q3. Define the term 'molar mass'. How is it calculated?

[Years Appeared: 2020, 2023]

Q4. What are the properties of acids and bases?

[Years Appeared: 2018, 2020]

Q5. Explain the working of a simple electric motor.

[Years Appeared: 2021, 2022]

Q6. What is a chemical reaction? Explain with an example.

[Years Appeared: 2019, 2022]

Q7. Describe the process of electrolysis of water.

[Years Appeared: 2020, 2023]

Q8. What is the difference between acids and bases?

[Years Appeared: 2019, 2021]

Long Questions

Q1. Describe the structure of the human heart and explain its working.

[Years Appeared: 2019, 2022]

Q2. Discuss the factors affecting the rate of reaction.

[Years Appeared: 2018, 2021]

Q3. Explain the different types of reproduction in plants.

[Years Appeared: 2020, 2023]

Q4. Discuss the importance of the ozone layer and the effects of ozone depletion.

[Years Appeared: 2019, 2022]

Q5. Describe the process of respiration in plants and animals.

[Years Appeared: 2018, 2021]

Q6. Describe the structure and function of the human heart.

[Years Appeared:2018, 2022]

Q7. What is Mendel's law of inheritance? Explain with examples.

[Years Appeared:2020, 2023]

Q8. Explain the process of plant reproduction.

[Years Appeared: 2019, 2021]

Q9. What is a redox reaction? Explain with examples.

[Years Appeared: 2020, 2023]

Q10. Describe the periodic table and explain the trends in properties of elements.

[Years Appeared: 2019, 2022]

Q11. Explain the process of the carbon cycle.

[Years Appeared: 2020, 2021]

Case Studies

Q1. Case Study: A person is suffering from a deficiency of Vitamin D. What are the symptoms and how can this be treated?

[Years Appeared: 2019, 2022]

Q2. Case Study: A chemical reaction occurs when two substances are mixed and heat is released. Identify the type of reaction and explain.

[Years Appeared: 2020, 2023]

Q3. Case Study: A plant is placed in different light conditions, and its growth is observed. What are the factors affecting plant growth, and how does light influence it?

[Years Appeared: 2021, 2022]

Q4. Case Study: A person notices that his skin burns after prolonged exposure to the sun. Explain the science behind this and the role of UV rays.

[Years Appeared: 2018, 2023]

Q5. Case Study: A group of students conducts an experiment involving a burning candle inside a bell jar. What does this experiment demonstrate about the nature of combustion?

[Years Appeared: 2020, 2023]

Q6. Case Study: A student adds a few drops of hydrochloric acid to a metal. A gas is evolved, and the temperature of the solution increases. Identify the reaction and explain.

[Years Appeared: 2020, 2022]

Q7. Case Study: A farmer uses fertilisers and notices an increase in crop yield. Explain the role of fertilisers in plant growth.

[Years Appeared: 2019, 2021]

Important Formula for CBSE Class 10 Science Based on Repeated Questions

1. Speed = Distance / Time

2. Energy = Power × Time

3. Resistance (R) = Voltage (V) / Current (I)

4. Stress = Force / Area

5. Weight on Moon = Weight on Earth × (1/6)

6. Potential Energy = mgh (where m is mass, g is the acceleration due to gravity, and h is the height)

7. Voltage = Current × Resistance

8. Kinetic Energy = ½ mv²

9. Maximum Height (h) = (u²) / (2g), where u is the initial velocity and g is the acceleration due to gravity.

10. Acceleration (a) = (v - u) / t, where v is the final velocity, u is the initial velocity, and t is time.

11. Work = Force × Displacement (in the direction of the force)

12. Energy (in kWh) = Power (in kW) × Time (in hours)

Preparation Strategy For CBSE Class 10 Science Exam

• Analyse the CBSE Class 10 Science Syllabus 2024-25 and mark the important topics.

• Prepare the short notes for Important formulas, derivation, and relations.

• Solve numerical problems based on repeated topics.

• Always write Proper units in numerical and memorise the conversions.

• Practice diagram-based questions with proper labelling and description.

• Solve CBSE Class 10 previous year question papers to increase confidence and boost morale

• Prepare a proper strategic timetable and follow it throughout.

• Take breaks between studies for relaxation.