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Biology MCQ Quiz Test your knowledge of biology concepts and terminology 50 Total Questions 0 Attempted 0 Correct 1 Reshuffles Reset & Reshuffle Show Results Reveal Answers Quiz Results × Total Questions 50 Attempted 0 Unattempted 50 Correct 0 Wrong 0 Percentage 0% Grade: F Your Name (Optional) Date: Number of Reshuffles: 1 Share via

📘 Study MCQs Q1. Which of the following is the best defining criteria to consider a thing as alive? A. Growth B. Reproduction C. Cellular organization and metabolism D. Movement AnswerC. Cellular organization and metabolismDetails While growth, reproduction, and movement are commonly seen in living organisms, they are not universal criteria. For example, mules cannot

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Q51. Black colour on silver is due to: A. Oxide ❌B. Sulphide ✅C. Chloride ❌D. Nitrate ❌Why correct: Silver reacts with sulphur to form black silver sulphide.Why others wrong: Oxide, chloride and nitrate do not cause black colour. Q52. Green colour on copper forms due to: A. Oxide ❌B. Carbonate ✅C. Chloride ❌D. Sulphide ❌Why

Q1. A substance is oxidised if it: A. Gains hydrogen ❌B. Loses oxygen ❌C. Gains oxygen ✅D. Gains water ❌Why correct: Oxidation means gain of oxygen.Why others wrong: Gaining hydrogen or losing oxygen means reduction; water has no role. Q2. A substance is reduced if it: A. Gains oxygen ❌B. Loses oxygen ✅C. Gains nitrogen

Q1. Heating lead nitrate produces brown fumes of: A. Nitric oxide ❌B. Nitrogen monoxide ❌C. Nitrogen dioxide ✅D. Nitrous oxide ❌Why correct: Nitrogen dioxide is brown.Why others wrong: The others are colorless gases. Q2. Brown coloured gas NO₂ is: A. Nitrous oxide ❌B. Nitrogen monoxide ❌C. Nitrogen dioxide ✅D. Nitric oxide ❌Why correct: NO₂ is

Q1. What happens when milk is left at room temperature during summers? A. It freezes ❌B. It evaporates ❌C. It undergoes a chemical reaction ✅D. It becomes salty ❌ Why correct: Milk turns sour due to formation of new substances.Why others wrong: No freezing, evaporation, or salting occurs. Q2. What change occurs when an iron

Q1. The balanced equation 3Fe + 4H₂O → Fe₃O₄ + 4H₂ uses water as: A. Liquid ❌B. Solid ❌C. Steam ✅D. Ice ❌ Why correct: The reaction occurs with steam, not liquid water.Why others wrong: Liquid/solid/ice forms do not react like this with iron. Q2. Symbol (g) represents: A. Graph ❌B. Gravity ❌C. Gas ✅D.