PHYSICS- Radiation Questions and Answers
Practice ModeShowing 10 of 25 questions
Q11
The instrument used to detect radiation is:
Answer: Option B
Explanation: Geiger-Muller counters detect and measure ionizing radiation by counting ionization events.
Q12
Which of these is a non-ionizing radiation?
Answer: Option D
Explanation: Microwave radiation doesn't have enough energy to ionize atoms and is used in communication and cooking.
Q13
Alpha radiation can be stopped by:
Answer: Option A
Explanation: Alpha particles have low penetrating power and can be stopped by a sheet of paper or skin.
Q14
Gamma radiation can be reduced effectively by:
Answer: Option C
Explanation: Dense materials like lead and concrete are most effective at attenuating gamma radiation.
Q15
Which radiation travels at the speed of light?
Answer: Option C
Explanation: Gamma rays are electromagnetic waves and therefore travel at the speed of light in vacuum.
Q16
Radioactivity is a property of:
Answer: Option A
Explanation: Heavy elements like uranium, radium, and thorium have unstable nuclei that undergo radioactive decay.
Q17
The harmful effect of radiation on living cells is due to:
Answer: Option B
Explanation: Ionizing radiation damages cells by creating ions and free radicals that disrupt molecular structures.
Q18
Which of the following is used in cancer treatment?
Answer: Option B
Explanation: Gamma radiation is used in radiotherapy to destroy cancer cells while sparing surrounding healthy tissue.
Q19
The energy of gamma rays is:
Answer: Option C
Explanation: Gamma rays have higher energy and shorter wavelength than X-rays and other electromagnetic radiation.
Q20
The process of emission of radiations from unstable nuclei is called:
Answer: Option C
Explanation: Radioactivity is the spontaneous emission of radiation from unstable atomic nuclei.