10th Physics Chapter 9: Radioactivity

Sr #	Questions	A	B	C	D
1	What safety measures can be taken to minimize radiation exposure?	Using shielding materials	Limiting exposure time	Increasing distance from radiation sources	All of the above
2	What is the half-life of a radioactive substance?	The time taken for the substance to lose half of its mass	The time taken for the substance to become stable	The time taken for the substance to emit half of its radiation	The time taken for the substance to decay completely
3	What is a common example of background radiation?	Radiation from medical procedures	Radiation from nuclear power plants	Radiation from cosmic rays	Radiation from X-ray machines
4	Which of the following statements about radioactive decay is true?	It can be accelerated by external factors	It is a reversible process	It releases energy in the form of heat only	It occurs randomly and spontaneously
5	What is nuclear fission?	The process of combining atomic nuclei to form a heavier nucleus	The process of splitting atomic nuclei into smaller nuclei	The process of converting mass into energy	The process of radioactive decay
6	Which of the following is a potential benefit of using radioisotopes?	Increased risk of radiation exposure	Enhanced medical diagnostics and treatments	Environmental pollution	Decreased risk of cancer
7	Which of the following is a safety precaution used in nuclear power plants?	Emergency evacuation drills	Radiation therapy	Unshielded exposure to radioactive materials	Lack of safety protocols
8	What is a nuclear transmutation?	The process of converting a stable nucleus into an unstable nucleus	The process of converting one element into another through nuclear reactions	The process of converting mass into energy	The process of radioactive decay
9	Which of the following is a common medical use of radioisotopes?	Food preservation	Smoke detectors	Cancer treatment	Household cleaning products
10	Which type of radiation has the highest penetrating power?	Alpha particles	Beta particles	Gamma rays	Neutrons
11	What are radioisotopes?	Isotopes with stable nuclei	Isotopes with unstable nuclei that undergo radioactive decay	Isotopes with high atomic numbers	Isotopes with low atomic numbers
12	How does the half-life of a radioactive substance affect its rate of decay?	The shorter the half-life, the faster the decay rate	The longer the half-life, the faster the decay rate	The shorter the half-life, the slower the decay rate	The half-life does not affect the decay rate