WBJEE PYQs for Nuclei with Solutions: Practice WBJEE Previous Year Questions

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Yashodeep Mahurkar

Updated on - Dec 31, 2025

Nuclei is an important topic in the Physics section in WBJEE exam. Practising this topic will increase your score overall and make your conceptual grip on WBJEE exam stronger.

This article gives you a full set of WBJEE PYQs for Nuclei with explanations for effective preparation. Practice of WBJEE Physics PYQs including Nuclei questions regularly will improve accuracy, speed, and confidence in the WBJEE 2026 exam.

WBJEE PYQs for Nuclei with Solutions

1.
ln the nuclear reaction $ _7^{14} N + X \rightarrow _6^{14} C + _1^1 H, $ the $X$ will be
- $ _{-1}^{0} e $
- $ _1^1 H $
- $ _1^2 H $
- $ _0^1 n $
View Solution
2.
If the half life of a radioactive nucleus is $3$ days, nearly what fraction of the initial number of nuclei will decay on the $3$rd day ? (Given that $\sqrt[3]{0.25} \approx 0.63)$)
- 0.63
- 0.5
- 0.37
- 0.13
View Solution
3.
The energy of gamma $(?)$ ray photon is $E_?$ and that of an X-ray photon is $E_x$. If the visible light photon has an energy of $E_v$ , then we can say that
- $E_x > E_? > E_v$
- $E_? > E_v > E_x$
- $E_? > E_x > E_v$
- $E_x > E_v > E_?$
View Solution
4.
Half-life of a radioactive substance is $20$ minute. The time between $20\%$ and $80\%$ decay will be :
- 20 min
- 30 min
- 40 min
- 25 min
View Solution

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WBJEE PYQs for Nuclei with Solutions

1.ln the nuclear reaction $ _7^{14} N + X \rightarrow _6^{14} C + _1^1 H, $ the $X$ will be

2.If the half life of a radioactive nucleus is $3$ days, nearly what fraction of the initial number of nuclei will decay on the $3$rd day ? (Given that $\sqrt[3]{0.25} \approx 0.63)$)

3.The energy of gamma $(?)$ ray photon is $E_?$ and that of an X-ray photon is $E_x$. If the visible light photon has an energy of $E_v$ , then we can say that

4.Half-life of a radioactive substance is $20$ minute. The time between $20\%$ and $80\%$ decay will be :

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Structure based on different categories

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1.
ln the nuclear reaction $ _7^{14} N + X \rightarrow _6^{14} C + _1^1 H, $ the $X$ will be

2.
If the half life of a radioactive nucleus is $3$ days, nearly what fraction of the initial number of nuclei will decay on the $3$rd day ? (Given that $\sqrt[3]{0.25} \approx 0.63)$)

3.
The energy of gamma $(?)$ ray photon is $E_?$ and that of an X-ray photon is $E_x$. If the visible light photon has an energy of $E_v$ , then we can say that

4.
Half-life of a radioactive substance is $20$ minute. The time between $20\%$ and $80\%$ decay will be :