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  Class 10 Science Assertion Reason Quiz | 50 Questions | StudyBeacon Class 10 Science – Assertion & Reason Online Quiz (50 Questions) Instructions: Select the correct option and click Show Answer to reveal explanation. Options: A. Both A and R are true and R is the correct explanation B. Both A and R are true but R is not the correct explanation C. A is true but R is false D. A is false but R is true Q1. Assertion: Mitochondria are called powerhouse of the cell. Reason: They synthesize ATP during respiration. A B C D Answer: A Explanation: ATP is the energy currency produced by mitochondria. Show Answer Q2. Assertion: Anaerobic respiration produces less energy. Reason: Glucose is incompletely oxidized. A B C D Answer: A Explanation: Partial breakdown of glucose releases less energy. Show Answer Q3. Assertion: Alveoli increase efficiency of respiration. Reason: They provide large surface area. A B C D Answer: A...

  Class 10 Science Most Important MCQs | Top 25 Questions | StudyBeacon Home › Class 10 Science › Most Important MCQs Class 10 Science – 25 Most Important MCQs (All Chapters) These 25 MCQs are the highest-yield questions repeatedly asked or implied in CBSE exams. Focus on concepts, not memorization. Biology (Q1–Q9) Q1. Energy currency of cell is: [Easy] ADP ATP NADH FAD Answer: ATP stores usable energy. Q2. Which tissue transports food in plants? [Easy] Xylem Phloem Cortex Cambium Answer: Phloem → translocation. Q3. Site of fertilization in humans: [Easy] Uterus Fallopian tube Ovary Cervix Answer: Ampulla of oviduct. Q4. Which gas is released in photosynthesis? [Easy] CO₂ O₂ N₂ H₂ Answer: Oxygen is by-product. Q5. Longest part of human brain: [Moderate] Cerebellum Midbrain Medulla oblongata Pons Answer: Controls vital reflexes. Q6. Which blood vessels have valves? [Moderate] Arteries Vein...

Class 10 Science Sample Paper MCQ Quiz | CBSE | StudyBeacon Home › Class 10 Science › Sample Paper MCQs Class 10 Science – Full MCQ Sample Paper (25 Questions) Practice this complete MCQ-based sample paper prepared as per CBSE exam trend. Questions include PYQ-type, conceptual and application-based MCQs. Section A – Biology (Q1–Q9) Q1. Which process releases energy in cells? [Easy] Photosynthesis Respiration Transpiration Diffusion Answer: Respiration releases energy. Q2. Functional unit of kidney is: [Easy] Neuron Nephron Alveolus Villus Answer: Nephron filters blood. Q3. Which blood group is universal donor? [Moderate] AB+ A− O− B− Answer: O− lacks antigens. Q4. Main function of bile is: [Moderate] Digest protein Emulsify fats Digest starch Absorb glucose Answer: Bile breaks fat into droplets. Q5. DNA is located in: [Easy] Ribosome Cytoplasm Nucleus Vacuole Answer: DNA stores genetic info. Q6. ...

  Electrochemistry – Complete Formula Sheet (JEE Main Only) 1. Electrochemical (Galvanic) Cell Oxidation → Anode (−) Reduction → Cathode (+) Electron flow: Anode → Cathode Cell Representation: Anode | Anode electrolyte || Cathode electrolyte | Cathode Zn | Zn²⁺ || Cu²⁺ | Cu 2. Electrode Potential & Electrochemical Series Standard Hydrogen Electrode (SHE): H⁺(1M) | H₂(1 atm) | Pt(s) E° = 0 V More +ve SRP → Strong oxidising agent More −ve SRP → Strong reducing agent Low SRP metals → Highly reactive 3. EMF of a Cell Formula: E° cell = E° cathode − E° anode E cell = RP cathode + OP anode Spontaneity: E° cell > 0 → Spontaneous E° cell < 0 → Non-spontaneous 4. Nernst Equation E cell = E° cell − (0.0591 / n) log Q Example: Zn | Zn²⁺ || Cu²⁺ | Cu E cell = E° cell − (0.0591 / 2) log ([Zn²⁺]/[Cu²⁺]) 5. Relation between EMF, ΔG & Kc ΔG° = −nF E° cell E° cell = (0.0591 / n) log K c Condition Infer...

    Modern Physics – Complete & Elaborated Revision (JEE Main) Modern Physics explains physical phenomena where classical physics fails. In JEE Main, this chapter is highly scoring because questions are formula-driven but concept-sensitive . A small misunderstanding leads to a wrong option. 1. Dual Nature of Radiation and Matter Experiments like the photoelectric effect proved that light behaves not only as a wave, but also as a stream of particles called photons . Similarly, matter particles also show wave nature. (A) Photoelectric Effect When light of sufficiently high frequency falls on a metal surface, electrons are emitted instantaneously. This phenomenon cannot be explained using wave theory alone. Einstein’s Photoelectric Equation: $h\nu = \phi + K_{\max}$ Here, $h\nu$ is photon energy, $\phi$ is work function of metal, and $K_{\max}$ is maximum kinetic energy of emitted electrons. Important derived relations: $K_{\max} = h\nu - \p...

  Life Processes – PYQ Interactive Quiz Chapter: Life Processes | Class 10 Biology (NCERT) Score: 0 / 25 1. Which of the following are energy foods? (a) Carbohydrates and fats (b) Proteins and minerals (c) Vitamins (d) Water Check Answer 2. Nutrition from a living host without killing it: Saprotrophic Parasitic Holozoic Autotrophic Check Answer 3. Mode of nutrition in fungi: Parasitic Holozoic Autotrophic Saprotrophic Check Answer 4. Roots absorb water by: Diffusion Transpiration Osmosis Mass flow Check Answer 5. Site of photosynthesis: Chloroplast Mitochondria Cytoplasm Protoplasm Check Answer 6. Digestion in Amoeba occurs in: Food vacuole Mitochondria Pseudopodia Chloroplast Check Answer 7. Absence of salivary amylase affects: Starch digestion Protein digestion Vitamin absorption Fat digestion Check Answer 8. Digested food is absorbed in: Stomach Small intestine Large...

  Life Processes – Smart & Complete Quick Revision (Class 10) This chapter explains the basic activities that keep organisms alive — nutrition, respiration, transport, and excretion — with strong emphasis on comparison, reasoning, and flow-based questions. 1. What Are Life Processes? Life processes are the essential functions performed by living organisms to maintain life. These include obtaining food, releasing energy, transporting materials, and removing wastes. Exam Insight: Viruses show life processes only inside a host — a favourite reasoning MCQ. 2. Nutrition Modes of Nutrition Autotrophic: Plants prepare food using sunlight Heterotrophic: Animals depend on others Photosynthesis (High Weightage) Occurs in chloroplasts using chlorophyll. $$ 6CO_2 + 6H_2O \xrightarrow{Sunlight, Chlorophyll} C_6H_{12}O_6 + 6O_2 $$ Stomata regulate gas exchange Light reaction → ATP, NADPH Dark reaction → glucose formation Trap: Oxygen released comes ...

  Carbon and Its Compounds – Smart & Complete Quick Revision (Class 10) Carbon is the backbone of life and organic chemistry. Its ability to form strong covalent bonds, long chains, branches, and rings makes it unique among all elements. This chapter explains why carbon forms millions of compounds and how these compounds behave in daily life and exams. 1. Why Carbon Forms So Many Compounds Carbon shows catenation (self-linking) and tetravalency . Each carbon atom forms four covalent bonds, leading to stable chains and rings. Example bond formation: $$ \text{Carbon valency} = 4 \Rightarrow \text{forms single, double, or triple bonds} $$ Exam Tip: Silicon also shows catenation, but carbon does it best due to smaller size and stronger C–C bonds. 2. Covalent Compounds – Key Properties Carbon compounds are mostly covalent because carbon does not easily lose or gain electrons. Low melting and boiling points Poor conductors of electricity Generall...

  Class 10 Science – Carbon & Its Compounds 25 PYQ-Based MCQ Practice Quiz High-yield CBSE PYQ-pattern MCQs covering hydrocarbons, ethanol, ethanoic acid, soaps, detergents & reactions. 1. The valency of carbon is: Difficulty: Easy 2 3 4 5 Show Answer Answer: 4 Carbon forms four covalent bonds. 2. Which property enables carbon to form long chains? Difficulty: Easy Isomerism Catenation Saturation Oxidation Show Answer Answer: Catenation 3. Which of the following is a saturated hydrocarbon? Difficulty: Easy Ethene Ethyne Methane Benzene Show Answer Answer: Methane 4. The general formula of alkanes is: Difficulty: Easy CₙH₂ₙ CₙH₂ₙ₊₂ CₙH₂ₙ₋₂ CₙHₙ Show Answer Answer: CₙH₂ₙ₊₂ 5. Which reaction converts vegetable oil into ghee? Difficulty: Moderate Oxidation Esterification Hydrogenation Fermentation Show Answer Answer: Hydrogenation 6. Ethanol reacts with sodium to produce: Difficu...