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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.

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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.

Attempt the questions page by page, check the correct answers, read the explanations where available, and compare your weak areas with past papers and mock test performance. Consistent MCQ practice improves speed, confidence, and retention for objective exam sections.

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1
Which material is considered the most effective shield against gamma radiation among the listed options?
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2
If a radioactive substance has a half-life of four months, how much time is required for three-fourths of the substance to decay?
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3
Why do alpha particles exhibit a shorter penetration depth in matter compared to beta particles?
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4
Which physical property of radioactive isotopes serves as a reliable characteristic for their identification?
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5
What is the term used to describe the average distance an alpha particle travels through air before its ionizing capability is exhausted?
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6
During the process of alpha decay, how does the proton number (atomic number) of the parent nucleus change?
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7
Technetium-99 has a half-life of 6 hours. If the initial mass is 300 mg, how much remains after 48 hours?
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8
What is the standard value of one curie in terms of radioactive disintegrations per second?
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9
Which type of nuclear radiation is characterized by its ability to travel without being deflected by magnetic or electric fields?
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10
What fraction of a radioactive sample remains after one half-life period has elapsed?
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