Class 12 Science Quiz (Physics, Biology, and Chemistry)

Science is the foundation of our understanding of the ecosystem around us, from the laws of motion to biochemical processes in living organisms. This quiz has all the essential MCQs across Physics, Chemistry, and Biology. It will test your core concepts like dimensional analysis, chemical bonding, and human physiology. 

Whether students are preparing for competitive exams or refreshing their knowledge, these questions highlight key topics: resistance units, Lenz’s Law, electronegativity trends, nephron filtration, and mitochondrial ATP production. Detailed answers clarify why certain options are correct, reinforcing learning. Dive in to assess your grasp of scientific principles, from transformer current ratios to the role of insulin in glucose regulation.  

Section 1: Physics

1. What is the dimensional formula of resistance?
   A. ML2T−3A−2ML^2T^{-3}A^{-2}ML2T−3A−2
   B. ML2T−2A−1ML^2T^{-2}A^{-1}ML2T−2A−1
   C. ML2T−3A−1ML^2T^{-3}A^{-1}ML2T−3A−1
   D. ML2T−2A−2ML^2T^{-2}A^{-2}ML2T−2A−2
   Answer: A
   
   
2. Which of the following is not a unit of power?
   A. Watt
   B. Joule/second
   C. Calorie
   D. Horsepower
   Answer: C
   
   
3. Which law gives the direction of induced current?
   A. Ampere's Law
   B. Faraday's Law
   C. Lenz's Law
   D. Ohm's Law
   Answer: C
   
   
4. What is the value of acceleration due to gravity on the Moon?
   A. 9.8 m/s²
   B. 3.7 m/s²
   C. 1.6 m/s²
   D. 6.5 m/s²
   Answer: C
   
   
5. In a transformer, the current in the primary and secondary coils is related to:
   A. The square of the turns ratio
   B. The turns ratio
   C. The inverse of the turns ratio
   D. The frequency
   Answer: C
   

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Section 2: Chemistry

1. Which of the following has the highest boiling point?
   A. Water
   B. Ethanol
   C. Methanol
   D. Ether
   Answer: A
   
   
2. Which element has the highest electronegativity?
   A. Oxygen
   B. Fluorine
   C. Nitrogen
   D. Chlorine
   Answer: B
   
   
3. Which of these compounds shows resonance?
   A. CH₄
   B. C₂H₆
   C. O₃
   D. NaCl
   Answer: C
   
   
4. Which type of isomerism is shown by C₂H₅OH and CH₃OCH₃?
   A. Functional group
   B. Chain
   C. Position
   D. Optical
   Answer: A
   
   
5. The rate of a chemical reaction depends on:
   A. Temperature
   B. Catalyst
   C. Reactant concentration
   D. All of the above
   Answer: D
   

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Section 3: Biology

1. Which hormone regulates blood sugar level?
   A. Thyroxine
   B. Insulin
   C. Adrenaline
   D. Cortisol
   Answer: B
   
   
2. Which part of the nephron is responsible for filtration?
   A. Loop of Henle
   B. Bowman's capsule
   C. Distal tubule
   D. Collecting duct
   Answer: B
   
   
3. Which structure in a cell is responsible for energy production?
   A. Ribosome
   B. Golgi body
   C. Mitochondria
   D. Lysosome
   Answer: C
   
   
4. The human genome consists of how many chromosomes?
   A. 22
   B. 46
   C. 44
   D. 48
   Answer: B
   
   
5. Which vitamin is synthesized in the human body with sunlight exposure?
   A. Vitamin B
   B. Vitamin C
   C. Vitamin D
   D. Vitamin K
   Answer: C
   

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Quiz Questions & Answers based on Chandrayaan-3 Mission