Class 9 Science and Technology – Daily Revision MCQ (English Medium)
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A car's velocity increases uniformly from 10 m/s to 30 m/s in 5 s. What is its acceleration?
Chapter 1: Laws of Motion
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Answer: C. 4 m/s²
a = (v − u) ÷ t = (30 − 10) ÷ 5 = 4 m/s².A ball of mass 2 kg is moving with a velocity of 3 m/s. What is its kinetic energy?
Chapter 2: Work and Energy
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Answer: A. 9 J
K.E. = ½ mv² = ½ × 2 × 3² = 9 J.In industry, power is often measured in horse power. 1 horse power is equal to how many watt?
Chapter 2: Work and Energy
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Answer: D. 746 W
The book states 1 horse power = 746 watt.Three resistors of 2 Ω, 3 Ω and 5 Ω are connected in series. What is the effective resistance?
Chapter 3: Current Electricity
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Answer: B. 10 Ω
In series, Rs = R1 + R2 + R3 = 2 + 3 + 5 = 10 Ω.What is the value of Avogadro's number (the number of molecules in one mole of a substance)?
Chapter 4: Measurement of Matter
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Answer: C. 6.022 × 10²³
One mole of any substance contains 6.022 × 10²³ molecules; this is Avogadro's number (NA).What is the pH of pure water?
Chapter 5: Acids, Bases and Salts
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Answer: B. 7.0
Pure water dissociates into equal H⁺ and OH⁻ ions, so it is neutral with pH 7.0.Spirogyra is a green, thread-like plant that grows in water and has no root, stem or leaves. To which division does it belong?
Chapter 6: Classification of Plants
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Answer: D. Thallophyta
Water plants without root-stem-leaves that make their own food (algae, like Spirogyra) belong to Thallophyta.When lactobacilli turn milk into curd (yoghurt), the lactose sugar in milk is changed into which acid?
Chapter 8: Useful and Harmful Microbes
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Answer: A. Lactic acid
Lactobacilli ferment lactose into lactic acid; this lowers the pH and the milk proteins coagulate into curd.Taking the speed of sound in air as 344 m/s, what is the minimum distance of a reflecting surface needed to hear a distinct echo?
Chapter 12: Study of Sound
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Answer: B. 17.2 m
The echo must arrive at least 0.1 s later: 344 × 0.1 = 34.4 m for the round trip, so the surface must be half of that, 17.2 m, away.Where in Maharashtra is the Giant Metrewave Radio Telescope (GMRT) set up?
Chapter 18: Observing Space : Telescopes
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Answer: C. Narayangaon near Pune
The GMRT, a set of 30 large dishes that study radio waves from space, is at Narayangaon near Pune.
Class 9: 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.