Physics MCQs with answers Page - 344

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Q. Which unit measures the biological effect of radiation?

  • (A) Gray
  • (B) Sievert
  • (C) Joule
  • (D) Coulomb

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Q. Which of the following protects the reactor from radiation leakage?

  • (A) Moderator
  • (B) Coolant
  • (C) Concrete shield
  • (D) Control rods

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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

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Q. Which nuclear disaster occurred in 1986?

  • (A) Three Mile Island
  • (B) Chernobyl
  • (C) Fukushima
  • (D) Tokaimura

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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

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Q. Which isotope is used in medical imaging and cancer treatment?

  • (A) Iodine-131
  • (B) Carbon-14
  • (C) Uranium-238
  • (D) Thorium-232

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Q. What is the typical temperature required for nuclear fusion to occur?

  • (A) 1,000°C
  • (B) 10,000°C
  • (C) 10 million°C
  • (D) 100°C

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Q. Which of the following isotopes is not radioactive?

  • (A) Uranium-235
  • (B) Carbon-12
  • (C) Radium-226
  • (D) Plutonium-239

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Q. What is the major challenge in controlling nuclear fusion reactions?

  • (A) Lack of uranium fuel
  • (B) Containment of high temperature plasma
  • (C) Excessive radiation leakage
  • (D) Low energy output

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