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Radioactivity and Decay Laws MCQs for Competitive Exams

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Radioactivity and Decay Laws MCQs for Competitive Exams

Practice with answers, explanations, and exam-focused revision notes.

144 MCQs Page 6

Topic Notes: Radioactivity and Decay Laws

These notes summarize the key preparation context before you attempt the MCQs. Review the topic focus, then practice the questions below with answers and explanations.

Quick Overview

Radioactivity and Decay Laws MCQs in Physics are useful for candidates who need targeted practice for CSS, PMS, FPSC, PPSC, NTS, entry tests, and other competitive exams in Pakistan. This topic page is designed for quick revision, repeated practice, and exam-focused preparation.

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51
Which radioactive isotope is frequently employed in medical radiotherapy for the treatment of various types of cancer?
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52
If the C-14 to C-12 ratio in a fossil is one-fourth of that in a living organism, and the half-life of C-14 is 5730 years, what is the approximate age of the fossil?
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53
Which of the following materials is primarily dated using the radiocarbon dating technique?
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54
Which type of ionizing radiation exhibits the lowest penetrating power?
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55
In addition to the daughter nucleus and a beta particle (electron or positron), what other particle is emitted during beta decay?
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56
What is the physical nature of gamma (γ) radiation?
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57
During an interaction between an alpha particle and an atom, which subatomic component is primarily displaced or removed?
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58
Given a radioactive isotope with a half-life of 6.5 seconds, what fraction of the original sample remains after 32.5 seconds?
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59
How does the nucleon number (mass number) of a nucleus change during the process of beta decay?
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60
What is the term for elements that naturally undergo radioactive decay?
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