Class 8 General Science – Daily Revision MCQ (English Medium)
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In 1969, into how many groups (kingdoms) did Robert Whittaker divide living organisms?
Chapter 1: Living World and Classification of Microbes
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Answer: C. 5
Whittaker's five kingdom system: Monera, Protista, Fungi, Plants and Animals.A force of 600 N acts perpendicular to a surface of area 3 m². What is the pressure on it?
Chapter 3: Force and Pressure
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Answer: A. 200 Pa
Pressure = force ÷ area = 600 N ÷ 3 m² = 200 N/m² = 200 Pa.The atomic number (Z) of an element is the number of ______.
Chapter 5: Inside the Atom
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Answer: B. protons in the nucleus
The number of protons in the nucleus of an atom is its atomic number, written as Z.Which of these metals stays liquid even at room temperature?
Chapter 7: Metals and Nonmetals
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Answer: B. Mercury
Metals are usually solid, but mercury and gallium are exceptions that are liquid at room temperature.Which cell organelle produces energy and stores it in the form of ATP?
Chapter 10: Cell and Cell Organelles
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Answer: D. Mitochondria
Mitochondria oxidise carbohydrates and fats and store the released energy as ATP.What colour does blue litmus paper turn when dipped in an acid like lemon juice?
Chapter 12: Introduction to Acid and Base
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Answer: A. Red
Blue litmus turns red in acids; red litmus turns blue in bases (alkali).One calorie of heat is equal to about how many joules?
Chapter 14: Measurement and Effects of Heat
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Answer: B. 4.18 J
Calorie is the CGS unit and joule the SI unit of heat; 1 calorie = 4.18 J.Two astronauts standing close on the Moon cannot hear each other speak directly. Why?
Chapter 15: Sound
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Answer: D. There is no air (medium) on the Moon to carry sound
Sound needs a medium like air to travel; the Moon has no atmosphere, so they use phone-like technology.A ray of light falls on a plane mirror at an angle of incidence of 40°. What is the angle of reflection?
Chapter 16: Reflection of Light
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Answer: D. 40°
By the laws of reflection, the angle of reflection always equals the angle of incidence.In an ecosystem, green plants that make food by photosynthesis are called ______.
Chapter 18: Ecosystems
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Answer: C. producers
Plants make food using sunlight, CO₂ and water, so they are the producers of an ecosystem.
Class 8: MCQ in other subjects
All questions are written by PadhaiNotes in our own words from the chapters of the official Maharashtra State Board Balbharati textbook (ebalbharati.in). Each question shows its chapter.