The JEE Main 2026 exam requires a perfect balance of speed, accuracy, and a solid understanding of the key concepts in Modern Physics. This article provides a set of Multiple Choice Questions (MCQs) on Modern Physics, designed to help you master the topic, enhance your problem-solving skills, and build conceptual clarity. These skills are crucial for excelling in the JEE Main 2026 exam.
Whether you're revisiting fundamental concepts, practicing advanced problems, or testing your knowledge, these JEE Main PYQs will serve as a valuable resource to boost your preparation and confidence.
With the JEE Main 2026 exam approaching, practicing these PYQs and reviewing detailed solutions will help you tackle the exam with confidence, improving your chances of securing a high rank. Make sure you stay ahead in your JEE Main 2026 preparation with these focused and structured questions.
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1.
Two sources of light emit with a power of 200 W.The ratio of number of photons of visible light emitted by each source having wavelengths 300 nm and 500 nm respectively, will be :- 1 : 5
- 1 : 3
- 5 : 3
- 3 : 5
2.
From the statements given below :
(A) The angular momentum of an electron in nth orbit is an integral multiple of h.
(B) Nuclear forces do not obey inverse square law.
(C) Nuclear forces are spin dependent.
(D) Nuclear forces are central and charge independent.
(E) Stability of nucleus is inversely proportional to the value of packing fraction.
Choose the correct answer from the options given below :- (A), (B), (C), (D) only
- (A), (C), (D), (E) only
- (A), (B), (C), (E) only
- (B), (C), (D), (E) only
3.
A long straight wire of circular cross-section (radius \( a \)) is carrying a steady current \( I \). The current \( I \) is uniformly distributed across this cross-section. The magnetic field is:- Zero in the region \( r<a \) and inversely proportional to \( r \) in the region \( r>a \)
- Inversely proportional to \( r \) in the region \( r<a \) and uniform throughout in the region \( r>a \)
- Directly proportional to \( r \) in the region \( r<a \) and inversely proportional to \( r \) in the region \( r>a \)
- Uniform in the region \( r<a \) and inversely proportional to distance \( r \) from the axis, in the region \( r>a \)
4.
The energy equivalent of 1g of substance is:- \( 11.2 \times 10^{24} \, \text{MeV} \)
- \( 5.6 \times 10^{12} \, \text{MeV} \)
- \( 5.6 \, \text{eV} \)
- \( 5.6 \times 10^{26} \, \text{MeV} \)
5.
A hydrogen atom is bombarded with electrons accelerated through a potential difference of \( V \), which causes excitation of hydrogen atoms. If the experiment is being performed at \( T = 0 \, \text{K} \), the minimum potential difference needed to observe any Balmer series lines in the emission spectra will be\[\frac{\alpha}{10} V,\]where \( \alpha = \, \underline{\hspace{2cm}} \).
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