Class 9 Science Important MCQs for Exams
Class 9 Science Important MCQs for Exams
Class: 9 |
Subject: Science |
Section: Exam Oriented |
Topic: Important MCQs for Exams
Based on: CBSE Board Examination Pattern & NCERT Syllabus
Based on: CBSE Board Examination Pattern & NCERT Syllabus
1. The smallest unit of life capable of independent existence is:
Answer: B. Cell
Explanation: The cell is the basic structural and functional unit of life. All living organisms are made of cells, and all vital activities occur within cells.
Explanation: The cell is the basic structural and functional unit of life. All living organisms are made of cells, and all vital activities occur within cells.
2. Which state of matter has definite volume but no definite shape?
Answer: B. Liquid
Explanation: Liquids have fixed volume but take the shape of the container due to weaker intermolecular forces than solids.
Explanation: Liquids have fixed volume but take the shape of the container due to weaker intermolecular forces than solids.
3. SI unit of force is:
Answer: C. Newton
Explanation: Force = Mass × Acceleration. Its SI unit is Newton (N), named after Sir Isaac Newton.
Explanation: Force = Mass × Acceleration. Its SI unit is Newton (N), named after Sir Isaac Newton.
4. The process of conversion of liquid into vapour below boiling point is:
Answer: B. Evaporation
Explanation: Evaporation occurs at all temperatures from the surface of a liquid and causes cooling.
Explanation: Evaporation occurs at all temperatures from the surface of a liquid and causes cooling.
5. Who proposed the law of conservation of mass?
Answer: B. Lavoisier
Explanation: Antoine Lavoisier stated that mass can neither be created nor destroyed in a chemical reaction.
Explanation: Antoine Lavoisier stated that mass can neither be created nor destroyed in a chemical reaction.
6. The speed of an object in uniform motion is:
Answer: C. Constant
Explanation: In uniform motion, an object covers equal distances in equal intervals of time.
Explanation: In uniform motion, an object covers equal distances in equal intervals of time.
7. Functional unit of kidney is:
Answer: B. Nephron
Explanation: Nephrons filter blood, remove wastes, and form urine.
Explanation: Nephrons filter blood, remove wastes, and form urine.
8. Which organelle is called the powerhouse of the cell?
Answer: B. Mitochondria
Explanation: Mitochondria produce ATP through respiration, supplying energy to the cell.
Explanation: Mitochondria produce ATP through respiration, supplying energy to the cell.
9. Boiling point of pure water at sea level is:
Answer: C. 100°C
Explanation: At 1 atmospheric pressure, water boils at 100°C.
Explanation: At 1 atmospheric pressure, water boils at 100°C.
10. Movement of water across semi‑permeable membrane is:
Answer: B. Osmosis
Explanation: Osmosis is diffusion of water through a semi‑permeable membrane from high to low concentration.
Explanation: Osmosis is diffusion of water through a semi‑permeable membrane from high to low concentration.
11. SI unit of work is:
Answer: B. Joule
Explanation: Work = Force × Distance. Its SI unit is Joule.
Explanation: Work = Force × Distance. Its SI unit is Joule.
12. Which gas is most abundant in Earth’s atmosphere?
Answer: B. Nitrogen
Explanation: Nitrogen makes up about 78% of the atmosphere.
Explanation: Nitrogen makes up about 78% of the atmosphere.
13. The outermost layer of Earth is:
Answer: C. Crust
Explanation: The crust is the thin outer layer where we live.
Explanation: The crust is the thin outer layer where we live.
14. Acceleration due to gravity on Earth is:
Answer: A. 9.8 m/s²
Explanation: It is the acceleration with which objects fall toward Earth.
Explanation: It is the acceleration with which objects fall toward Earth.
15. Which vitamin is produced in sunlight?
Answer: D. Vitamin D
Explanation: Skin synthesizes Vitamin D in presence of sunlight.
Explanation: Skin synthesizes Vitamin D in presence of sunlight.
16. The transfer of heat in solids occurs by:
Answer: A. Conduction
Explanation: Heat passes through particle vibration without movement of matter.
Explanation: Heat passes through particle vibration without movement of matter.
17. Unit of electric current is:
Answer: B. Ampere
Explanation: It measures rate of flow of electric charge.
Explanation: It measures rate of flow of electric charge.
18. Green plants prepare food by:
Answer: B. Photosynthesis
Explanation: Plants use sunlight, CO₂ and water to make glucose.
Explanation: Plants use sunlight, CO₂ and water to make glucose.
19. Instrument used to measure atmospheric pressure:
Answer: B. Barometer
Explanation: It measures pressure exerted by atmosphere.
Explanation: It measures pressure exerted by atmosphere.
20. Loss of water from plant leaves is:
Answer: B. Transpiration
Explanation: Water evaporates through stomata, helping in cooling and water transport.
Explanation: Water evaporates through stomata, helping in cooling and water transport.