10th Physics Chapter 9: Radioactivity

Sr #	Questions	A	B	C	D
1	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
2	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
3	Which type of radiation has the highest penetrating power?	Alpha particles	Beta particles	Gamma rays	Neutrons
4	Which of the following is a common medical use of radioisotopes?	Food preservation	Smoke detectors	Cancer treatment	Household cleaning products
5	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
6	What is a fission chain reaction?	A reaction in which neutrons are absorbed by atomic nuclei	A reaction in which the products of one reaction trigger further reactions	A reaction in which alpha particles are emitted	A reaction in which protons are converted into neutrons
7	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
8	Which type of radiation consists of two protons and two neutrons?	Alpha particles	Beta particles	Gamma rays	Neutrons
9	What term describes the spontaneous emission of radiation from the nucleus of an unstable atom?	Nuclear fusion	Nuclear fission	Radioactivity	Electromagnetism
10	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
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	Which of the following is not a type of radiation emitted during natural radioactivity?	Alpha particles	Beta particles	Gamma rays	Protons
13	What is nuclear fusion?	The process of splitting atomic nuclei into smaller nuclei	The process of combining atomic nuclei to form a heavier nucleus	The process of converting mass into energy	The process of radioactive decay
14	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
15	What is the central part of an atom that contains protons and neutrons?	Electrons	Nucleus	Isotopes	Neutrons
16	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
17	What are some hazards associated with exposure to radiation?	Increased risk of cancer	Radiation sickness	Genetic mutations	All of the above
18	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
19	Which subatomic particle has a positive charge and is found in the nucleus of an atom?	Proton	Neutron	Electron	Photon
20	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