Science-9

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 primary requirement for sound to be produced?a) An electric sourceb) A vibrating objectc) A liquid mediumd) High temperature Answer: b) A vibrating objectExplanation: Sound is produced when an object vibrates, creating a disturbance in the surrounding medium. This vibration leads to the generation of sound waves, as seen in the tuning … Read more

Q1. Which sub-atomic particle was discovered by J.J. Thomson? a) Proton b) Neutron c) Electron d) Positron Answer: c) Electron Explanation: J.J. Thomson discovered the electron in 1897. His experiments with cathode rays led to the identification of the electron as a fundamental sub-atomic particle carrying a negative charge. Q2. What was the main conclusion … Read more

Q1. Which of the following is not a macronutrient for plants? a) Nitrogen b) Phosphorus c) Iron d) Potassium Answer: c) Iron Explanation: Macronutrients are those which plants consume in larger quantities. Iron, although essential, is a micronutrient required in smaller amounts. Q2. What is the primary benefit of crop rotation? a) Increases soil salinity … Read more

Q1. What happens to an object when unbalanced forces act on it? a) It continues moving at the same velocity b) Its motion remains unchanged c) It accelerates d) It vanishes Answer: c) It accelerates Explanation: An object accelerates when unbalanced forces act on it. This change can be in the form of a change … Read more

Question 1 What is the scientific definition of work? a) Any physical or mental activity b) Force applied with no displacement c) Force causing displacement in the direction of the force d) Movement of an object in any direction Answer: c) Force causing displacement in the direction of the force Explanation: In science, work is … Read more