Class 9 Science and Technology – Daily Revision MCQ (English Medium)
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In an ecosystem, herbivores such as grasshoppers and squirrels that feed directly on plants are called:
Chapter 7: Energy Flow in an Ecosystem
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Answer: B. Primary consumers
Herbivores eat producers (plants) directly, so they form the level of primary consumers.The radius of curvature of a concave mirror is 30 cm. What is its focal length?
Chapter 11: Reflection of Light
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Answer: D. 15 cm
Focal length is half of the radius of curvature: f = R/2 = 30/2 = 15 cm.A spherical mirror whose OUTER surface is the reflecting surface is called a:
Chapter 11: Reflection of Light
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Answer: A. Convex mirror
When the outer (bulging) surface of a spherical mirror reflects light, the mirror is convex.Which type of coal is known as the pure form of coal and contains about 95% carbon?
Chapter 13: Carbon : An important element
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Answer: C. Anthracite
Anthracite is hard coal with about 95% carbon; bituminous has 70–90% and lignite 60–70%.Methane is found on the surface of marshy land. Because of this, methane is also called:
Chapter 13: Carbon : An important element
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Answer: C. Marsh gas
Methane forms on the surface of marshes (swamps), so it is also known as marsh gas.Of the three kinds of radiation given out by radioactive substances, which one does NOT deviate at all in an electric field?
Chapter 14: Substances in Common Use
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Answer: A. Gamma rays
Alpha and beta rays bend towards the charged plates, but gamma rays carry no charge and do not deviate.Teflon, used as a non-stick coating on cooking utensils, is a polymer of which substance?
Chapter 14: Substances in Common Use
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Answer: D. Tetrafluoroethylene
Teflon is polytetrafluoroethene (C₂F₄)n, the polymer of tetrafluoroethylene, discovered by Roy J. Plunkett in 1938.Which part of the human brain controls involuntary actions such as heartbeat, breathing, sneezing and coughing?
Chapter 15: Life Processes in Living Organisms
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Answer: B. Medulla oblongata
The medulla oblongata, the hind-most part of the brain, controls involuntary activities like heartbeat and breathing.In Mendel's dihybrid cross, round-yellow seeded pea plants (RRYY) were crossed with wrinkled-green seeded plants (rryy). What were the seeds of all F1 plants like?
Chapter 16: Heredity and Variation
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Answer: A. Round and yellow
All F1 plants were RrYy; round and yellow are dominant, so every F1 plant gave round-yellow seeds.Which connective tissue joins muscles to bones?
Chapter 17: Introduction to Biotechnology
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Answer: C. Tendons
Tendons are fibrous, strong and less elastic and join muscles to bones; ligaments join bone to bone.
Class 9: MCQ in other subjects
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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.