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1) What is meant by a substance? Answer: A substance is a form of matter that has a uniform and definite composition. It can be either an element or a compound, where all the constituent particles have the same chemical nature. 2) List the points of differences between homogeneous and heterogeneous mixtures. • Homogeneous Mixtures: … Read more
Activity 8.1: Understanding Inertia Objective: To demonstrate the concept of inertia and how it affects the motion of objects. Materials Needed: Carom coins, striker, table. Procedure: 1. Make a pile of similar carom coins on a table. 2. Attempt a sharp horizontal hit at the bottom of the pile using another carom coin or the … Read more
Q1. Why must a magnesium ribbon be cleaned before burning in air? a) To increase its weight b) To remove the protective layer of oxide on its surface c) To make it look shiny d) To prevent it from burning Answer: b) To remove the protective layer of oxide on its surface Explanation: A magnesium … Read more
Q1. What was a significant reason for historians’ fascination with dates in history? a) To mark the achievements of rulers b) Because history is synonymous with memorizing dates c) As a method to understand changes over time d) To emphasize the importance of battles Answer: c) As a method to understand changes over time Explanation: … Read more
Q1. What is the primary purpose of nomenclature in the study of living organisms? a) To classify organisms into different categories based on their uses b) To standardize the naming of living organisms worldwide c) To differentiate between plants and animals d) To organize organisms based on their morphological similarities Answer: b) To standardize the … Read more
1) Understanding Electric Circuits and Ohm’s Law Background: An electric circuit comprises various components like resistors, batteries, and measuring instruments connected through conductive wires. The flow of electric charge through this setup defines the electric current, measured in amperes (A). Ohm’s Law states that the current through a conductor between two points is directly proportional to … Read more
Q1. What is the SI unit of electric charge? a) Ampere (A) b) Coulomb (C) c) Ohm (Ω) d) Volt (V) Answer: b) Coulomb (C) Explanation: The SI unit of electric charge is the Coulomb (C), which represents the amount of charge contained in nearly 6 × 10^18 electrons. Q2. According to Ohm’s Law, the … Read more
Q1. Matter is made up of tiny particles. This concept was illustrated through an activity involving the dissolution of: a) Salt in oil b) Sand in water c) Salt in water d) Sugar in alcohol Answer: c) Salt in water Explanation: The dissolution of salt in water was used to demonstrate that matter is made … Read more
Q1. What is the role of dietary fibers in our body? a) They provide energy. b) They help in the absorption of proteins. c) They aid in digestion and prevent constipation. d) They are the main source of nutrients. Answer: c) They aid in digestion and prevent constipation. Explanation: Dietary fibers, also known as roughage, … Read more
Q1. What pigment is necessary for the process of photosynthesis in plants? a) Xanthophyll b) Chlorophyll c) Anthocyanin d) Carotene Answer: b) Chlorophyll Explanation: Chlorophyll is the green pigment located in the chloroplasts of plant cells that captures the energy of sunlight for photosynthesis, making it essential for this process. Q2. Which of the following … Read more