Physics MCQ Questions with answers

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Here Important Physics MCQ questions are added which are frequently asked in almost all the examinations. You can check the correct answer of any question on clicking the show answer button. The Correct answer will be displayed below. You can share any question with your friends on whatsapp by tapping Share button.

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📊 Physics
Q. Which element is used as fuel in breeder reactors?
  • (A) Plutonium-239
  • (B) Carbon-12
  • (C) Hydrogen-1
  • (D) Helium-4
💬 Discuss
✅ Correct Answer: (A) Plutonium-239

Explanation: Breeder reactors use plutonium-239 or uranium-238 to generate more fissile material.

📊 Physics
Q. What is the main by-product of uranium fission?
  • (A) Helium
  • (B) Barium and Krypton
  • (C) Carbon dioxide
  • (D) Hydrogen
💬 Discuss
✅ Correct Answer: (B) Barium and Krypton

Explanation: When uranium-235 undergoes fission, it splits into smaller nuclei like barium and krypton.

📊 Physics
Q. Which law governs the rate of radioactive decay?
  • (A) Inverse square law
  • (B) Exponential law
  • (C) Hooke’s law
  • (D) Ohm’s law
💬 Discuss
✅ Correct Answer: (B) Exponential law

Explanation: Radioactive decay follows an exponential law: N = N₀e⁻λt, where λ is the decay constant.

📊 Physics
Q. What is the SI unit of radioactive activity?
  • (A) Curie
  • (B) Becquerel
  • (C) Rutherford
  • (D) Sievert
💬 Discuss
✅ Correct Answer: (B) Becquerel

Explanation: The becquerel (Bq) is the SI unit of activity, equal to one disintegration per second.

📊 Physics
Q. Which unit measures the biological effect of radiation?
  • (A) Gray
  • (B) Sievert
  • (C) Joule
  • (D) Coulomb
💬 Discuss
✅ Correct Answer: (B) Sievert

Explanation: Sievert measures the biological effect of radiation on human tissue.

📊 Physics
Q. Which of the following protects the reactor from radiation leakage?
  • (A) Moderator
  • (B) Coolant
  • (C) Concrete shield
  • (D) Control rods
💬 Discuss
✅ Correct Answer: (C) Concrete shield

Explanation: Thick concrete walls absorb harmful radiation to prevent environmental exposure.

📊 Physics
Q. What happens in a chain reaction?
  • (A) Only one fission occurs
  • (B) Each fission causes further fissions
  • (C) Energy is absorbed continuously
  • (D) No energy is released
💬 Discuss
✅ Correct Answer: (B) Each fission causes further fissions

Explanation: A chain reaction occurs when neutrons from one fission trigger additional fissions.

📊 Physics
Q. Which nuclear disaster occurred in 1986?
  • (A) Three Mile Island
  • (B) Chernobyl
  • (C) Fukushima
  • (D) Tokaimura
💬 Discuss
✅ Correct Answer: (B) Chernobyl

Explanation: The Chernobyl disaster occurred in Ukraine in 1986, releasing large amounts of radioactive material.

📊 Physics
Q. What type of decay converts a proton into a neutron?
  • (A) Beta-plus decay
  • (B) Beta-minus decay
  • (C) Alpha decay
  • (D) Gamma emission
💬 Discuss
✅ Correct Answer: (A) Beta-plus decay

Explanation: In beta-plus decay, a proton changes into a neutron while emitting a positron.

📊 Physics
Q. Which isotope is used in medical imaging and cancer treatment?
  • (A) Iodine-131
  • (B) Carbon-14
  • (C) Uranium-238
  • (D) Thorium-232
💬 Discuss
✅ Correct Answer: (A) Iodine-131

Explanation: Iodine-131 is used to diagnose and treat thyroid disorders and some cancers.

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