CBSE ADDA

Our environment🏙️ is a tapestry woven with ecosystems, intricate connections, and the delicate balance of life.  In Class 10 Science Chapter 15, "Our Environment," we embark on a captivating journey to understand the interplay between nature and human impact.  Let's dive into the depths of each topic, gaining a deeper appreciation for the world around us: 🌿 Ecosystems: The Symphony of Life Ecosystems are dynamic communities where organisms interact with each other and their surroundings. From the lush rainforests to the vast oceans, ecosystems vary in size and complexity. Within each, energy flows through food chains, transferring life's sustenance from producers to consumers.  Learn how trophic levels maintain equilibrium and why disruptions can lead to cascading effects on the entire ecosystem. 🌍 Environmental Problems: A Global Call to Action The flourishing of human society has brought forth environmental challenges. Pollution, deforestation, and ha

X Class 10 Physics 📖Electricity in simplify way by JSunil sir 🔭  I'd be happy to simplify the chapter on Electricity for tenth standard🤔 students: 🪄In JSunil Sir 🪄way ⤵️➡️➡️➡️➡️⬆️⬆️↩️⤵️ #Electricity is like magic ✨ that #powers our world. It's the flow of tiny particles called electrons through wires and circuits.  👉Let's break it down into simple bits: 1. What is Electricity? Electricity💡♉ is the movement of tiny particles called electrons . Imagine them like little energy carriers that flow through materials, making things work. 2. Circuits and Pathways Think of circuits like a path for the electrons to travel. A circuit needs three things: a power🪫 source (like a battery), a pathway (wires), and something to use the electricity (a bulb or device). 3. Current ⚡and Voltage🔋 Current is the flow of electrons in a circuit, and voltage is the "push" that makes them move. It's like water flowing in a river (current) because of the slope (volta

Class 10 physics chapter source of Energy for Class 10 science Q.1. Choose the incorrect statement Source of Energy (a) It is expected to harness wind power to minimum in open space. (b) The potential energy content of wind blowing at high altitudes is the source of wind power. (c) Wind hitting at the blades of a windmill causes them to rotate. The rotation thus achieved can be utilized further (d) One possible method of utilizing the energy of rotational motion of the blades of a windmill is to run the turbine of an electric generator. Ans (b) Q.2. Acid rain happens because: (a) sun leads to heating of upper layer of atmosphere. (b) burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere. (c) electrical charges are produced due to friction amongst clouds. (d) earth atmosphere contains acids. Ans . (b) Q.3. In a hydro power plant (a)potential energy possessed by stored water is converted into electricity. (b) kinetic energy possessed by stored water is

X Atmospheric Refraction and Scattering and Tyndal effect of light related topic-based question answer for CBSE Board Examination CBSE NCERT Physics Class 8 and class 10 chapter light The change in path of light as it passes through the atmosphere is known as atmospheric refraction. Effects are Blue colour of sky, rainbow in the sky, difference in colours of the Sun observed during sunrise/sunset and noon, sun appears reddish whereas at noon the sun appears white. 1. What is the difference in colours of the Sun observed during sunrise/sunset and noon? Give explanation for each. Ans: During sunrise and sunset the sun appears reddish whereas at noon the sun appears white. At sunrise and sunset, the light coming from the sun has to travel a longer distance through the atmosphere to reach us. Therefore, the blue and green components of white light are gets scattered away Hence, during sunrise and sunset the sun appears reddish. When the sun is overhead at noon, then the light coming from

X Class 10 Chemical reaction and Equation chapter wise MCQ Section – A (1 mark) 1.  4NH 3 (g) + 5O 2 (g) → 4NO(g) + 6H2O(g) is an example of  (i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction (a) (i) and (iv)             (b) (ii) and (iii)              (c) (i) and (iii)             (d) (iii) and (iv) 2. Which of the following statements are correct?  3Fe(s) + 4H 2 O(g) → Fe 3 O 4 (s) + 4H 2 (g) (i) Iron metal is getting oxidised                     (ii) Water is getting reduced (iii) Water is acting as reducing agent             (iv) Water is acting as oxidising agent (a) (i), (ii) and (iii)        (b) (iii) and (iv)            (c) (i), (ii) and (iv)        (d) (ii) and (iv) 3. Which of the following are exothermic processes? (i) Reaction of water with quick lime              (ii) Dilution of an acid (iii) Evaporation of water                                 (iv) Sublimation of camphor (a) (i) and (ii)    

  1. Which of the following statements about the given reaction are correct? 3Fe (s)  + 4H 2 O (g)  => Fe 3 O 4(s)  + 4H 2(g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent (a) (i), (ii) and (iii) (b) (iii) and (iv) (c) (i), (ii) and (iv) (d) (ii) and (iv)   2.In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?  (a) Lead sulphate  (b) Lead acetate  (c) Potassium sulphate 3. A solution of X is used for white washing walls. it reacts slowly with Y in air to form a thin layer of B on walls which gives walls a shiny finish. which of the following options correctly represents X,Y and B ?   a) X =slaked lime , Y = nitrogen , B=calcium oxide b