Science Notes

NEUTRON AND PROTON NEUTRON Neutrons are subatomic particles found in the nucleus of an atom, alongside protons. Here are some key points to understand about neutrons: 1. ** Charge **: Neutrons are electrically neutral, meaning they have no charge. This distinguishes them from protons, which are positively charged, and electrons, which are negatively charged. 2. ** Mass **: Neutrons have a mass slightly greater than that of protons. Compared to electrons, protons and neutrons have substantially larger masses. 3. ** Role in the Nucleus **: Neutrons play a crucial role in the stability of the nucleus. They help to offset the electrostatic repulsion between the positively charged protons. The nucleus would become unstable and disintegrate in the absence of neutrons. 4. ** Discovery **: The neutron was discovered in 1932 by the physicist James Chadwick. His discovery helped to further our understanding of atomic structure and led to significant advancements in nuclear physics. 5...

CHEMISTRY MCQ PART 1 Here are 20 multiple-choice questions (MCQs) on chemistry with explanations for each answer: 1. **What is the atomic number of carbon?**    A) 6    B) 8    C) 12    D) 14    **Answer: A) 6**    Explanation: The atomic number represents the number of protons in an atom. Carbon has 6 protons. 2. ***What gas is often referred to as "laughing gas"?    A) Nitrous oxide    B) Carbon dioxide    C) Helium    D) Methane    **Answer: A) Nitrous oxide**    Explanation: Nitrous oxide, \( N_2O \), is commonly known as laughing gas due to its euphoric effects when inhaled. 3. **What type of bond is formed when electrons are shared between atoms?**    A) Ionic bond    B) Covalent bond    C) Metallic bond    D) Hydrogen bond    **A...

Science part 2 Here are 15 multiple-choice questions (MCQs) on various science topics along with short explanations for each: 1 * * What is the chemical symbol for water ?**    - A) H2O    - B) CO2    - C) O2    - D) H2    - ** Answer :** A) H2O    - 2. * *What type of macromolecule are enzymes?**    - A) Carbohydrates    - B) Lipids    - C) Proteins    - D) Nucleic acids    - ** Answer :** C) Proteins     3. ** What is the powerhouse of the cell? **    - A) Nucleus    - B) Mitochondria    - C) Ribosome    - D) Golgi apparatus    - ** Answer :** B) Mitochondria    - ** Explanation :** Mitochondria generate most of the cell's supply of ATP, used as a source of chemical energy. 4. ** Which element is the most abundant in the Earth's crust ?**    - A) Iron    - B) Oxygen    - C) Sili...

SCIENCE PART 1  Here are 20 science multiple-choice questions (MCQs) with their answers: 1 **What is the powerhouse of the cell?**    - A) Nucleus    - B) Mitochondria    - C) Ribosome    - D) Endoplasmic reticulum    - **Answer: B) Mitochondria** 2. **What is the chemical symbol for gold?**    - A) Au    - B) Ag    - C) Go    - D) Gd    - **Answer: A) Au** 3. **What is the speed of light in a vacuum?**    - A) Approximately 300,000 km/s    - B) Approximately 150,000 km/s    - C) Approximately 400,000 km/s    - D) Approximately 200,000 km/s    - **Answer: A) Approximately 300,000 km/s** 4. **What type of bond is formed when electrons are shared between atoms?**    - A) Ionic bond    - B) Covalent bond    - C) Metalli...