Class 8 General Science – Daily Revision MCQ (English Medium)
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Dengue spreads through the bite of which mosquito?
Chapter 2: Health and Diseases
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Answer: B. Aedes aegypti
The textbook says dengue is spread by the Aedes aegypti mosquito; Anopheles spreads malaria and Culex spreads elephantiasis.Four cells of 1.5 V each are joined in series (positive terminal of one to the negative terminal of the next). What is the total potential difference of this battery?
Chapter 4: Current Electricity and Magnetism
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Answer: C. 6 V
In a series connection the potential differences add up: 4 × 1.5 V = 6 V.Chlorophyll is a complex compound. Atoms of which metal are present at the centre of its structure?
Chapter 6: Composition of Matter
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Answer: D. Magnesium
The book gives chlorophyll (with magnesium), haemoglobin (with iron) and vitamin B-12 (with cobalt) as complex compounds.Carbon monoxide (CO) from vehicle and factory smoke harms us mainly by:
Chapter 8: Pollution
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Answer: A. Lowering the oxygen-carrying capacity of blood
The pollutant table says CO lowers the capacity of blood to carry oxygen.The intensity of an earthquake is expressed on which scale?
Chapter 9: Disaster Management
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Answer: B. Richter scale
An earthquake is recorded by a seismograph and its intensity is measured on the Richter scale.Blood is which type of tissue?
Chapter 11: Human Body and Organ System
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Answer: C. Fluid connective tissue
The textbook describes blood as a red fluid connective tissue.What colour does methyl orange indicator show in an acid?
Chapter 12: Introduction to Acid and Base
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Answer: A. Pink
Methyl orange turns pink in an acid and yellow in an alkali.When a pinch of baking soda is added to lemon juice, bubbles appear. Which gas is formed?
Chapter 13: Chemical Change and Chemical Bond
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Answer: D. Carbon dioxide
Citric acid in lemon juice reacts with sodium bicarbonate to give carbon dioxide and sodium citrate.The textbook asks citizens to follow the 4R principle. Which of these is NOT one of the 4 Rs?
Chapter 17: Man made Materials
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Answer: D. Replace
The 4 Rs in the book are Reduce, Reuse, Recycle and Recover.A 'light year' is a unit used to measure:
Chapter 19: Life Cycle of Stars
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Answer: A. Very large distances
A light year is the distance light travels in one year (about 9.5 × 10¹² km).
Class 8: 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.