Nuclear & Radiochemistry JEE Main PYQs PDF, 2020–2025

Nuclear & Radiochemistry has 10 questions in JEE Main papers from 2020 to 2025, about 1.7 per year across all shifts. All 10 are in the free PDF, with an answer key. The most asked topic is Radioactive Decay Series (9 questions), followed by Artificial Radioactivity (1).

Asked in JEE Main: 102020–2025, all shifts
In this free PDF: 10all of them, with answers
Asked in 2025: 1Latest paper: 2025 Jan S1
Most asked topic: Radioactive Decay Series9 Qs · 90% of the chapter
Difficulty mix: 70% easy · 30% mediumof the questions in the PDF

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Source: official NTA JEE Main papers · Updated 17 Oct 2026

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How often it's asked in JEE Main

Nuclear & Radiochemistry had almost no questions in recent JEE Main papers (2024–26). Most asked topic: Radioactive Decay Series. No questions in the 2026 papers. (Not named as a topic in the 2026 syllabus.)

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Nuclear & Radiochemistry questions per year

Year	Asked	In PDF
2025	1	1
2024	2	2
2023	1	1
2022	2	2
2021	3	3
2020	1	1

Topic-wise weightage by year

How many Nuclear & Radiochemistry questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Topic	Asked	Share	2025	2024	2023	2022	2021	2020
Radioactive Decay Series	9	90%	1	2	1	2	2	1
Artificial Radioactivity	1	10%	·	·	·	·	1	·
All topics	10	100%	1	2	1	2	3	1

Swipe the table sideways for older years.

Newest questions (2025)

The only JEE Main 2025 Nuclear & Radiochemistry question in the free PDF.

JEE Main 2025 · 22 Jan · Shift 1 · Radioactive Decay Series

Which of the following statement is not true for radioactive decay?
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Sample questions from recent papers

JEE Main 2024 · 1 Feb · Shift 1 · Radioactive Decay Series

The ratio of

\frac{{ }^{14} \mathrm{C}}{{ }^{12} \mathrm{C}}

in a piece of wood is

\frac{1}{8}

part that of atmosphere. If half life of

{ }^{14} \mathrm{C}

is 5730 years, the age of wood sample is ________ years.

Show answer

Answer: 17190

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JEE Main 2021 · 26 Feb · Shift 2 · Artificial Radioactivity

Which of the following forms of hydrogen emits low energy

\beta

^- particles?

(A)Tritium $_1^3$ H
(B)Proton H⁺
(C)Protium $_1^1$ H
(D)Deuterium $_1^2$ H

Show answer

Answer: (A)

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Frequently asked

How many questions come from Nuclear & Radiochemistry in JEE Main?

10 questions from 2020 to 2025, about 1.7 per year. In 2025 it had 1.

Which Nuclear & Radiochemistry topics are most important for JEE Main?

By past papers: Radioactive Decay Series (90%) and Artificial Radioactivity (10%) of all Nuclear & Radiochemistry questions.

Is the Nuclear & Radiochemistry PYQ PDF free?

Yes. The PDF and its answer key are free, and you can practise the questions online with no login, with step-by-step solutions where available.

Prefer to solve online? Practise Nuclear & Radiochemistry online with step-by-step solutions where available, or work through JEE Main papers shift by shift.

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JEE Main PYQs by year: 2026 · 2025 · 2024 · 2023 · 2022 · 2021 · 2020

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