CLASS 10 {Boardwallah}

🧪 1. Chemical Reactions & Equations What is a chemical reaction? Give two examples. Balance chemical equations and identify the type of reaction. Explain combination, decomposition, displacement, and double-displacement reactions with examples. What is oxidation and reduction? Explain with an example. What is corrosion? How can it be prevented? What is rancidity? How can it be prevented? ⚗️ 2. Acids, Bases & Salts Define acids and bases. Give examples. Explain the pH scale and its importance in everyday life. Why does dry HCl gas not change the colour of dry litmus paper? Explain the preparation and uses of baking soda, washing soda, and bleaching powder. What happens when acids react with metals, metal carbonates, and metal hydrogen carbonates? Explain the chlor-alkali process. 🔩 3. Metals & Non-metals Explain the reactivity series of metals. Why do ionic compounds have high melting points? Explain the formation of NaCl using electron transfer. What is corrosion? Explain methods of preventing it. Explain the extraction of metals from their ores. Compare the physical and chemical properties of metals and non-metals. 🧬 4. Carbon & Its Compounds Why does carbon form such a large number of compounds? Explain covalent bonding with methane (CH₄). What are homologous series? Give examples. Explain the properties and uses of ethanol and ethanoic acid. What is esterification? Write the reaction. Explain the cleansing action of soap. Differentiate between saturated and unsaturated hydrocarbons.

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MCQS OF LIGHT CHAPTER 1.The SI unit of power of a lens is: A) Metre B) Dioptre C) Watt D) Joule 2.Which mirror is used as a shaving mirror? A) Plane mirror B) Convex mirror C) Concave mirror D) None of these 3.The image formed by a plane mirror is: A) Real and inverted B) Virtual and erect C) Real and erect D) Virtual and inverted 4.A convex lens is also known as: A) Diverging lens B) Converging lens C) Cylindrical lens D) Plane lens 5.The bending of light when it passes from one medium to another is called: A) Reflection B) Refraction C) Dispersion D) Scattering 6.The focal length of a plane mirror is: A) Zero B) Infinity C) One metre D) Negative 7.The mirror formula is: 8.Which mirror is used as a rear-view mirror in vehicles? A) Plane mirror B) Concave mirror C) Convex mirror D) None of these 9.The image formed by a convex mirror is always: A) Real and inverted B) Virtual, erect and diminished C) Real and magnified D) Virtual and magnified 10.The refractive index of air is approximately: A) 1 B) 1.33 C) 1.5 D) 2 11.The power of a lens is measured in: A) Watt B) Metre C) Dioptre D) Newton 12.A concave lens always forms an image that is: A) Real and inverted B) Virtual, erect and diminished C) Real and magnified D) Virtual and magnified 13.According to the law of reflection: A) Angle of incidence = Angle of reflection B) Angle of incidence > Angle of reflection C) Angle of reflection = 90° D) None of these 14.Which lens is thicker at the centre than at the edges? A) Concave lens B) Convex lens C) Cylindrical lens D) Plane lens 15.The image formed by a convex lens when the object is beyond 2F is: A) Real, inverted and diminished B) Virtual and erect C) Real and magnified D) Virtual and magnified 16.The power of a concave lens is: A) Positive B) Negative C) Zero D) Infinite 17.The principal focus of a concave mirror is: A) Behind the mirror B) At infinity C) In front of the mirror D) At the pole 18.The speed of light is maximum in: A) Water B) Glass C) Air D) Vacuum 19.A ray passing through the optical centre of a convex lens: A) Bends towards the principal axis B) Retraces its path C) Passes undeviated D) Reflects back 20.The mirror used in solar cookers is: A) Plane mirror B) Convex mirror C) Concave mirror D) Cylindrical mirror

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⚠️ IMPORTANT ⚠️ Best Books to start your preparation for new session 2026-27 !! Read these books and do all questions 😉 you can get 90-95% easily ( but do these books completely)

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This year many questions were directly from this book only so download it fast for next session

⚠️ IMPORTANT ⚠️ Best Books to start your preparation for new session 2026-27 !! Read these books and do all questions 😉 you can get 90-95% easily ( but do these books completely) Based on new 2026-27 syllabus Class 9th -https://bit.ly/3V3QRYC Class 10th- https://bit.ly/3ViMnib Class 11th - https://bit.ly/3yBCT90 Class 12th - https://bit.ly/3VjU5c0 Jee + Neet -  https://bit.ly/4e2UgQb Download and save these PDFs before deleting !! It may get deleted anytime 🥺🥹 This year many questions were directly from this book only so download it fast for next session

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🔥Nationalism in India – Timeline🔥 @iitianpatrika 1915  -- Mahatma Gandhi returned to India. 1916 --Gandhiji travelled to Champaran to inspire peasants against the oppressive plantation system. 1917 --- Gandhiji organised Satyagraha in Kheda district of Gujarat. 1918 --- Gandhiji went to Ahmedabad to organise Satyagraha among cotton mill workers. 1918-19 ---Distressed Uttar Pradesh peasants organised by Baba Ramchandra 1919 --Khilafat Committee was formed in Bombay. 1919 --- Hartal against Rowlatt Act; 1919----Jallianwalla Bagh Massacre 1920---Gandhiji convinced other leaders of the need to start a Non-Cooperation Movement in support of Khilafat as well as for Swaraj in                       Calcutta Congress Session. 1921-- Non-Cooperation and Khilafat Movement launched. 1922 ---Incident of Chauri Chaura; Gandhiji withdrew Non-Cooperation Movement. 1924 ---Alluri Sitaram Raju arrested ending a two years armed tribal struggle. 1927---Federation of the Indian Chamber of Commerce and Industries (FICCI) was formed. 1928-- The Simon Commission arrived in India. 1928 --- The Hindustan Socialist Republic Army (HSRA) was founded. 1929 --- Lord Irwin announced a vague offer of ‘dominion status’ for India. 1929 ---Lahore Congress; Congress adopted the demand for ‘Puma Swaraj’. 1930---- Dr BR Ambedkar established Depressed Classes Association. 1930 ---- Gandhiji begins Civil Disobedience Movement by breaking Salt Law at Dandi. 1931---- Gandhiji ends Civil-Disobedience Movement; Gandhi-lrwin Pact; Second Round Table Conference. 1932---Poona pact signed between Dr Babasaheb Ambedkar and Mahatma Gandhi; Civil Disobedience Movement relaunched. ♥For more important  short notes and regular chapter quizes join this channel students👍👍👍. @iitianpatrika