Class 10 Science and Technology Part 1 – Daily Revision MCQ (English Medium)
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According to Kepler's third law, the square of a planet's period of revolution (T²) is directly proportional to which power of its mean distance (r) from the Sun?
Chapter 1: Gravitation
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Answer: C. r³
Kepler's third law says T² ∝ r³: the square of the period is proportional to the cube of the mean distance from the Sun.How many groups and periods does the modern periodic table have?
Chapter 2: Periodic Classification of Elements
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Answer: A. 18 groups and 7 periods
In the modern periodic table the vertical columns (groups) are 18 and the horizontal rows (periods) are 7.Calcium oxide reacts with water to form calcium hydroxide as the only product, giving out a lot of heat. Which type of reaction is this?
Chapter 3: Chemical Reactions and Equations
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Answer: B. Combination reaction
Two reactants (CaO and H₂O) join to form a single product, Ca(OH)₂, so it is a combination reaction.A 2000 W electric heater is used for 3 hours. How many units of electrical energy does it use? (1 unit = 1 kWh)
Chapter 4: Effects of Electric Current
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Answer: D. 6 units
2000 W = 2 kW; energy = 2 kW × 3 h = 6 kWh = 6 units.When water is heated from 0 °C, at what temperature is its volume minimum?
Chapter 5: Heat
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Answer: B. 4 °C
From 0 °C to 4 °C water contracts instead of expanding, so its volume is minimum at 4 °C (anomalous behaviour of water).In the dispersion of white light, which colour has the longest wavelength (close to 700 nm)?
Chapter 6: Refraction of Light
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Answer: A. Red
Red light has the maximum wavelength (about 700 nm) and violet the smallest (about 400 nm).A convex lens has a focal length of 25 cm. What is its power?
Chapter 7: Lenses
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Answer: C. +4 D
P = 1/f (in metres) = 1/0.25 m = +4 D; a convex lens has positive focal length, so its power is positive.In galvanizing, which metal is coated on iron or steel to prevent corrosion?
Chapter 8: Metallurgy
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Answer: B. Zinc
Galvanizing means applying a thin layer of zinc on iron or steel; zinc corrodes first because it is more electropositive.Which general formula represents the molecular formulae of the homologous series of alkenes?
Chapter 9: Carbon Compounds
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Answer: D. CnH2n
Alkenes follow CnH2n; for n = 2 it gives C₂H₄ (ethene), for n = 3 it gives C₃H₆.A satellite revolving in an orbit about 35780 km above the earth's surface takes about how long to complete one revolution?
Chapter 10: Space Missions
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Answer: C. 24 hours
At about 35780 km height a satellite takes around 24 hours per revolution, the same as the earth's rotation, so it appears stationary from the earth.
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.