PHYSICS- Radiation Questions and Answers

Practice Mode
Showing 10 of 25 questions
Q21
To prevent radiation exposure, workers use:
  • A Apron and gloves
  • B Lead shielding
  • C Plastic suits
  • D Cotton clothes
Answer: Option B
Explanation: Lead shielding is effective because lead is dense and has high atomic number, absorbing radiation well.
Q22
Which law describes the decrease in radioactive atoms over time?
  • A Ohm's law
  • B Boyle's law
  • C Radioactive decay law
  • D Avogadro's law
Answer: Option C
Explanation: The radioactive decay law describes exponential decrease in the number of radioactive atoms over time.
Q23
When a radioactive nucleus emits an alpha particle, its atomic number:
  • A Increases by 2
  • B Decreases by 2
  • C Remains the same
  • D Decreases by 4
Answer: Option B
Explanation: Alpha decay reduces atomic number by 2 because 2 protons are lost in the alpha particle.
Q24
When a beta particle is emitted, the mass number:
  • A Increases by 1
  • B Decreases by 1
  • C Remains the same
  • D Doubles
Answer: Option C
Explanation: Beta decay changes a neutron to a proton, so mass number remains the same while atomic number increases by 1.
Q25
Which radiation can be used for sterilizing medical instruments?
  • A Gamma rays
  • B Infrared rays
  • C Alpha rays
  • D Beta rays
Answer: Option A
Explanation: Gamma radiation effectively kills microorganisms and is used for sterilization without heating.

📚 More from General Science

← All Topics 🎯 Practice ⏱️ Take Test 🔍 Search
General Science
Back to General Science
Other Subjects
Questions and Answers for Competitive Exams Various Entrance Test