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

Science is the basis of our understanding of the surrounding ecosystems, from the laws of motion to the biochemical processes of organisms. This test has all the necessary MCQs in physics, chemistry and biology. It will test your core concepts such as dimensional analysis, chemical bonding, and human physiology.

Whether students prepare for competitive exams or refresh their knowledge, these questions focus on key topics: resistance units, Lenz’s law, electronegative trends, renal renal filtration and mitochondrial ATP production. The detailed answers illustrate why certain options are correct and can enhance learning. From the transformer current ratio to the role of insulin in glucose regulation, sneak into your grasp of scientific principles.

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Section 1: Physics

1. What is the dimensional formula for resistance? A. ml2t-3a-2ml^2t^{ – 3} a^{ – 2} ml2t-3a −2 B. ml2t-2a-1ml^2t^2t^{ – 2} a^{ – 1} a^{ – 1} ml2t-1} ml2t-1 c.ml2t-c.ml2t-3a-1ml^3a-1ml^2t} ml2t −2a-2ml^2t^{ – 2} a^{ – 2} ml2t-2a −2Answer: a
2. Which of the following is not a power unit? A. Watt B. Joule/Second C. Calories D. Horsepower Answer: C
3. Which law gives the direction of inducing 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 caused by gravity on the moon? A. 9.8 m/s²B. 3.7 m/s²C. 1.6 m/s²D. 6.5 m/s² Answer: C
5. In a transformer, the current in the main and secondary coils is: A. Square of the turn ratio. Turn ratio. The countdown of the turn ratio D. 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.Ch₄B.C₂H₆C.O₃D. NACL Answer: C
4. What type of isomericism does c₂h₅oh and ch₃och₃ show? A. Functional group B. Chain C. Position D. Optical answer: A
5. The rate of chemical reaction depends on: A. Temperature B. Catalyst C. Reactant concentration D. All the above answers: D

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Section 3: Biology

1. Which hormone regulates blood sugar levels? A. Thyroxine B. Insulin C. Adrenaline D. Cortisol Answer: B
2. Which part of the nephron is responsible for filtering? A. Henle B. Bowman capsule C. Distal tubules D. Collection pipe Answer: B
3. Which structure in the unit is responsible for energy production? A. Ribosome B. Golgi C. Mitochondria D. Lysosome Answer: C
4. How many chromosomes does the human genome consist of? A. 22 B. 46 C. 44 D. 48 Answer: B
5. Which vitamin is synthesized when sunlight is exposed to human body? A. Vitamin B. Vitamin C C. Vitamin D D. Vitamin K Answer: C

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