Most Challenging Class 10th Science Problems and Tips to Solve
Most Challenging Class 10th Science Problems: Class 10 Science is a crucial subject that helps candidates create a solid foundation for higher classes. Additionally, students can enhance their overall score in board exams by mastering the topics covered in the class 10 Science syllabus.
Understanding key concepts and solving questions based on them is essential to perform well in Science. However, many students find some topics specifically challenging. To answer questions from these challenging chapters, students need to follow a strategic approach. Therefore, to effectively strengthen board exam preparation, students should aim to understand various types of most challenging class 10th Science problems and learn the tips to solve them.
Most Challenging Class 10th Science Problems and Tips to Solve
In class 10, Science is divided into three parts: Physics, Chemistry, and Biology. Students may experience varying levels of difficulty in different chapters of class 10 Science. Some specific topics seem more difficult, and they require focused learning strategies. Below are the most demanding Science chapters with challenging questions and tips to solve them:
Most Challenging Class 10th Science Problems from Physics
Class 10 Physics includes a total of 5 chapters. Out of these chapters, many students find Light, Electricity, and the Magnetic Effect of Electric Current extremely difficult. Here are some of the most challenging class 10th Physics problems with tips to solve:
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Light – Reflection and Refraction
This chapter comprises the properties of light as it travels through different media, including reflection and refraction. Students have to learn the fundamental laws of reflection and refraction, mirrors, and lenses. They also learn image formation using the mirror formula and lens formula, which are essential in understanding the workings of devices like telescopes and microscopes.
Question: A convex lens forms a real image of an object placed 20 cm away. The image is 40 cm from the lens. Calculate the focal length of the lens.
Tips to Solve: Use the formula:
1/f = 1/v - 1/u
where f is the focal length, v is the image distance, and u is the object distance.
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Electricity
Class 10 Physics chapter “Electricity” explains the Science behind electric power. Students learn about electric current, potential difference, resistance, and Ohm’s law. The chapter also covers practical aspects like calculating the equivalent resistance of resistors in series and parallel. Additionally, students learn what electric power is and how to calculate energy consumption in daily life.
Question: Three resistors of 5Ω, 10Ω, and 15Ω are connected in parallel. Calculate the total resistance of the circuit.
Tips to Solve: Use the Formula for Parallel Resistance:
1/Rtotal=1/R1+1/R2+1/R3
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Magnetic Effect of Electric Current
This chapter explores the relationship between electricity and magnetism. It introduces the concept of how electric current can produce a magnetic field. The chapter explores important concepts such as the magnetic field around a straight current-carrying conductor, a circular loop, and a solenoid. All these topics help students understand how devices like electromagnets and electric motors work.
Question: A solenoid has 500 turns and carries a current of 3 A. The length of the solenoid is 0.4 m, and the radius of each turn is 0.02 m. Calculate the magnetic field at the center of the solenoid. Assume the permeability of free space, μ0, to be 4π×10−7 T m/A.
Tip to Solve: Use the formula to calculate the magnetic field BBB inside a solenoid is:
B=μ0⋅N/L⋅I
Where:
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B is the magnetic field
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μ0 is the permeability of free space
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N is the number of turns
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L is the length of the solenoid
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I is the current
Most Challenging Class 10th Science Problems from Biology
Class 10 Biology is a scoring subject. However, students must focus on understanding the key concept of every chapter and solve questions to improve their problem solving ability. Here are some of the most challenging questions from important chapters of class 10 Biology:
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Heredity and Evolution
This chapter explains the key properties governing genetic inheritance. Students get to learn how traits are passed down through generations. It introduces Mendel’s laws of inheritance, the concept of dominant and recessive traits, and the significance of genetic variation in evolution. Additionally, it explains Darwin’s theory of natural selection and how species evolve over time.
Question: In a dihybrid cross between two heterozygous pea plants (RrYy × RrYy), what is the phenotypic ratio of the offspring?
Tips to Solve:
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Understand the Dihybrid Cross: A dihybrid cross involves two traits. Here, R (round) and r (wrinkled) denote one trait, while Y (yellow) and y (green) denote another.
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Use the Punnett Square: Draw a 4x4 Punnett square to account for all possible allele combinations of the offspring.
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Determine Phenotypic Ratios: Count the number of offspring expressing each phenotype.
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Life Processes
This chapter includes essential life processes such as nutrition, respiration, transportation, and excretion in plants and animals. It explains how the human body digests food, transports oxygen and nutrients, and removes waste, providing a comprehensive understanding of how living beings function.
Question: Describe how water and minerals are transported in plants. Why do root pressure and transpiration pull play a key role in this process?
Tips to Solve:
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Root Pressure: Generated when water enters the roots due to osmosis, pushing water upward.
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Transpiration Pull: As water evaporates from the leaves, it creates a negative pressure, pulling water upward through the xylem vessels.
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How Do Organisms Reproduce?
In this chapter, students learn the modes of reproduction in different organisms, from simple asexual methods in unicellular organisms to complex sexual reproduction in plants and animals. It also explains the human reproductive system, the menstrual cycle, and the importance of reproductive health.
Question: Explain the process of double fertilization in plants. Why is it considered unique to angiosperms?
Tips to Solve:
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Define double fertilization: One male gamete fuses with the egg cell to form a zygote (syngamy). The second male gamete fuses with two polar nuclei to form a triploid endosperm (triple fusion).
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Explain its uniqueness: This process is unique to angiosperms because it leads to the formation of both a diploid zygote and a triploid endosperm.
Most Challenging Class 10th Science Problems from Chemistry
Class 10 Chemistry includes several challenging concepts that require a strong understanding and application of key principles. Here are some of the most challenging problems in Class 10 Chemistry, with tips to solve them.
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Carbon and Its Compounds
In this chapter, students learn the versatile nature of carbon atoms and their ability to form millions of compounds. Students understand what are hydrocarbons, their functional groups, homologous series, and different types of chemical bonding in organic compounds. The chapter also covers important reactions like combustion, oxidation, and substitution, as well as the properties and uses of ethanol and ethanoic acid.
Question: Explain why carbon forms covalent bonds. Write the electron dot structure of methane and ethane.
Tips to Solve: Understand why carbon cannot form ionic bonds:
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Carbon has 4 valence electrons.
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To achieve a stable octet, it can neither lose 4 electrons nor gain 4 electrons.
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Thus, carbon shares its electrons to form covalent bonds.
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Draw the electron dot structures:
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Methane (CH₄): Carbon shares its 4 valence electrons with 4 hydrogen atoms, forming single covalent bonds.
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Electron dot structure: H:C:H H:H
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Ethene (C₂H₄): Each carbon atom shares two electrons with the other, forming a double bond, and shares the remaining two electrons with hydrogen atoms.
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Electron dot structure: H:C::C:H
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Chemical Reactions and Equations
This chapter introduces the concept of chemical reactions, types of reactions, and the method of balancing chemical equations. It covers combination reactions, decomposition reactions, displacement reactions, redox reactions, and precipitation reactions. Students learn that balancing chemical equations is a fundamental skill required to understand stoichiometry and chemical processes.
Question: Balance the chemical equation provided below also identify the type of reaction:
Al+Fe2O3→Al2O3+Fe
Tips to Solve:
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Start by balancing the atoms of metals (Al and Fe)
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Balance the aluminum atoms
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Check the oxygen atoms
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Verify the equation
Most Challenging Class 10th Science Problems FAQs
Q1. What is the toughest lesson in Science class 10?
Ans. The most challenging chapters in Class 10 Science include Electricity, Chemical Reactions and Equations, and Light.
Q2. How to achieve 100% in Science class 10?
Ans. To get 100% in class 10 Science, students should thoroughly cover each chapter, understand the key concepts, solve various types of questions, assess their performance in test series, and work on weak areas.
Q3. What is the best way to study Science class 10?
Ans. The best way to study Science in class 10 includes covering all the chapters included in the NCERT textbook and solving practice questions given at the end of each chapter. Additionally, students should understand and practice diagrams and equations in different chapters.
Q4. How to revise Science in one day?
Ans. To revise Science in one day, students should focus on covering the topics they have already studied, review important formulas, go through the diagrams, and read important points from each concept.
Q5. Which subject is hardest in science class 10?
Ans. Most students find Physics the most challenging Science subject in class 10.
