Contact us

Comments

Post a Comment

Popular posts from this blog

CLASS XII Physics MCQs

Class 10 Physics MCQs Class 10 Physics MCQs Here are 30 Multiple Choice Questions (MCQs) for Class 10 Physics based on the NCERT syllabus . These questions cover topics from Light – Reflection and Refraction , Human Eye and the Colorful World , Electricity , and Magnetic Effects of Electric Current . Light – Reflection and Refraction 1. The image formed by a plane mirror is: a) Real and inverted b) Virtual and erect c) Real and erect d) Virtual and inverted 2. The focal length of a concave mirror is 20 cm. Its radius of curvature is: a) 10 cm b) 20 cm c) 40 cm d) 5 cm 3. A concave mirror forms a real and inverted image of an object at a distance of 40 cm from the mirror. If the object is placed at 20 cm from the mirror, the image will be: a) Real and inverted b) Virtual and erect c) Real and e...
Read more

SET - 1 SCIENCE MCQs 30 (MCQS for Class 10 Science subject based on NCERT)

Class 10 Science MCQs Class 10 Science MCQs Note: Answers are in page 4 1. Which of the following is a balanced chemical equation? a) H₂ + O₂ → H₂O b) 2H₂ + O₂ → 2H₂O c) H₂ + 2O₂ → H₂O₂ d) 2H₂ + 2O₂ → 2H₂O 2. The pH of a neutral solution at 25°C is: a) 0 b) 7 c) 14 d) 1 3. Which of the following metals does not react with cold water? a) Sodium b) Calcium c) Magnesium d) Potassium 4. The functional group present in ethanol is: a) –CHO b) –COOH c) –OH d) –CO 5. Which of the following is not a life process? a) Respiration b) Reproduction ...
Read more

Chapter 4: Carbon and Its Compounds (notes with previous years questions)

Class 10 Science - Chapter 4: Carbon and Its Compounds Class 10 Science - Chapter 4: Carbon and Its Compounds 1. Introduction to Carbon Carbon is the 4 th most abundant element in the universe and the 15 th most abundant element in the Earth's crust. Atomic number of carbon : 6 Electronic configuration : 2, 4 Carbon achieves stability by sharing electrons, forming covalent bonds . 2. Why Carbon is Unique 1. Catenation : Carbon can form long chains, branched chains, and rings by bonding with other carbon atoms. Example: Ethane (C 2 H 6 ), Propane (C 3 H 8 ), Benzene (C 6 H 6 ). 2. Tetravalency : Carbon can form 4 covalent bonds with other atoms (e.g., hydrogen, oxygen, nitrogen, etc.). Example: Methane (CH 4 ), Carbon tetrachloride (CCl 4 ). 3. Formation of Multiple Bonds : Carbon can form single (C-C) , double (C=C) , or triple (C≡C)...
Read more