Class 10 Science and Technology Part 1 – Daily Revision MCQ (English Medium)
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At which place on the earth is the value of the acceleration due to gravity (g) the highest?
Chapter 1: Gravitation
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Answer: B. At the poles
The earth is flatter at the poles, so its radius is smallest there and g is highest (about 9.832 m/s²); it is lowest at the equator.According to the modern periodic law, the properties of elements are a periodic function of their what?
Chapter 2: Periodic Classification of Elements
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Answer: D. Atomic numbers
Moseley showed that atomic number is a more fundamental property than atomic mass, so the modern periodic law is based on atomic numbers.Old cooking oil or fried food kept for a long time gets a foul smell and changed taste because of air oxidation. What is this called?
Chapter 3: Chemical Reactions and Equations
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Answer: A. Rancidity
Air oxidation of oils and fats makes them rancid; the foul odour and taste is called rancidity.A current of 2 A flows through a resistance of 5 Ω for 10 s. How much heat is produced? (H = I²Rt)
Chapter 4: Effects of Electric Current
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Answer: C. 200 J
Joule's law of heating: H = I²Rt = 2² × 5 × 10 = 4 × 50 = 200 J.How much heat is needed to change 25 g of ice at 0 °C into water at 0 °C? (latent heat of melting of ice = 80 cal/g)
Chapter 5: Heat
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Answer: A. 2000 cal
Heat absorbed = mass × latent heat = 25 × 80 = 2000 cal; the temperature stays at 0 °C while the ice melts.Why do stars appear to twinkle?
Chapter 6: Refraction of Light
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Answer: B. Atmospheric refraction: the refractive index of air keeps changing
Moving air keeps changing in temperature and density, so its refractive index changes and the star's apparent position and brightness keep changing.For a normal human eye, at what distance from the eye is the near point?
Chapter 7: Lenses
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Answer: D. 25 cm
The minimum distance of distinct vision for a normal eye is 25 cm; the object's position at that distance is the near point.In the froth floatation method, particles of which substance get wetted by oil and float up with the froth?
Chapter 8: Metallurgy
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Answer: C. Metal sulphides
Metal sulphide particles are hydrophobic, so they are wetted by oil and rise with the froth, while the hydrophilic gangue is wetted by water and stays behind.Ethanoic acid reacts with ethanol in the presence of an acid catalyst. Which compound is formed along with water?
Chapter 9: Carbon Compounds
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Answer: A. Ethyl ethanoate (an ester)
This is the esterification reaction: CH₃COOH + CH₃CH₂OH → CH₃COOCH₂CH₃ + H₂O.What was the most important discovery of India's Chandrayaan-1 mission (2008)?
Chapter 10: Space Missions
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Answer: B. Presence of water on the Moon's surface
Chandrayaan-1 orbited the Moon and sent information for about a year; its most important finding was water on the Moon's surface.
Class 10: 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.