Class 9th English Medium Science Important QAs

🔹 Very Short Answer (1 mark) Q1. What is agriculture?Ans. Cultivation of crops and rearing of animals for food and other products. Q2. Define horticulture.Ans. Science of growing fruits, vegetables, flowers, and ornamental plants. Q3. What is pisciculture?Ans. Rearing and breeding of fish commercially. Q4. What is sericulture?Ans. Cultivation of silk-producing silkworms. Q5. Define crop […]

🔹 Very Short Answer (1 mark) Q1. What is sound?Ans. Vibrations that travel through a medium and can be heard by our ears. Q2. Name the medium through which sound cannot travel.Ans. Vacuum (no air or particles). Q3. What is amplitude of a sound wave?Ans. Maximum displacement of particles from mean position. Q4. What is

🔹 Very Short Answer (1 mark) Q1. Define work.Ans. Work is said to be done when a force is applied on an object and it is displaced in the direction of the force. Q2. State the SI unit of work.Ans. Joule (J). Q3. Define 1 Joule of work.Ans. Work done when a force of 1

🔹 Very Short Answer (1 mark) Q1. What is gravitation?Ans. The attractive force by which every object in the universe pulls every other object towards itself. Q2. Who formulated the law of gravitation?Ans. Sir Isaac Newton. Q3. What is the SI unit of gravitational force?Ans. Newton (N). Q4. Define acceleration due to gravity (g).Ans. The

🔹 Very Short Answer (1 mark) Q1. Define force.Ans. A push or pull on an object which can change its state of rest or motion. Q2. What is the SI unit of force?Ans. Newton (N). Q3. Who formulated the three laws of motion?Ans. Sir Isaac Newton. Q4. Define inertia.Ans. The tendency of a body to

🔹 Very Short Answer (1 mark) Q1. Define motion.Ans. Motion is the change in position of a body with respect to time and a reference point. Q2. What is rest?Ans. A body is said to be at rest if its position does not change with respect to a reference point. Q3. What is distance?Ans. The

🔹 Very Short Answer (1 mark) Q1. What is a tissue?Ans. A group of similar cells performing a specific function. Q2. Who coined the term “tissue”?Ans. Bichat. Q3. How many types of plant tissues are there?Ans. Two – Meristematic and Permanent. Q4. What are meristematic tissues?Ans. Actively dividing cells in plants responsible for growth. Q5.

🔹 Very Short Answer (1 mark) Q1. Who discovered the cell?Ans. Robert Hooke in 1665. Q2. Who proposed the cell theory?Ans. Schleiden and Schwann. Q3. Who discovered the nucleus?Ans. Robert Brown. Q4. What is the structural and functional unit of life?Ans. Cell. Q5. Name the smallest cell.Ans. Mycoplasma. Q6. Name the largest cell.Ans. Ostrich egg.

🔹 Very Short Answer Questions (1 mark) Q1. Who discovered the electron?Ans. J.J. Thomson. Q2. Who discovered the proton?Ans. E. Goldstein (discovered canal rays → protons identified). Q3. Who discovered the neutron?Ans. James Chadwick in 1932. Q4. What is the charge on an electron?Ans. –1 (negative). Q5. Name the experiment conducted by Rutherford.Ans. Alpha particle

🔹 Very Short Answer Questions (1 mark) Q1. Who was the first to use the term ‘atom’?Ans. The term ‘atom’ was first used by the Greek philosopher Democritus. Q2. Who gave the modern atomic theory?Ans. John Dalton. Q3. What is the smallest particle of an element that takes part in a chemical reaction?Ans. Atom. Q4.

🔹 Very Short Answer Questions (1 Mark Each) Q1. Define pure substance.Ans. A substance made up of only one kind of particles (atoms or molecules) is called a pure substance. Q2. What is a mixture?Ans. A substance composed of two or more pure substances physically mixed in any proportion. Q3. Give two examples of elements.Ans.

🔹 Very Short Answer Questions (1 Mark Each) Q1. Define matter.Ans. Anything that has mass and occupies space is called matter. Q2. Name the three states of matter.Ans. Solid, Liquid and Gas. Q3. What is diffusion?Ans. The intermixing of particles of two substances on their own is called diffusion. Q4. Which state of matter has