JENPAS UG 2025 Quantum Theory Sample Questions with Solutions

Quantum Theory is an important concept and topic under the Physics section of the JENPAS UG 2025 exam. Questions from topics like the dual character of light and matter, the photoelectric effect, Planck's quantum hypothesis, quantisation of energy, and corresponding atomic models can be expected in the exam. The exam will be conducted for 90 minutes, and Paper I comprises 20 questions of Physics, totalling 25 marks. Through this article, we will give you the PDF and a set of sample questions on Quantum Theory with solutions, which will assist you in practice and boost confidence for this important section of the JENPAS UG 2025 exam.

Also Read: What is a Good Score in JENPAS UG 2025?

Sample Quantum Theory Questions with Solutions for JENPAS UG 2025

Check out the list of some important sample solved questions on Quantum Theory for the JENPAS UG 2025 exam:

Question 1: What physical significance does the quantum number 'n' have?

Answer: The principal quantum number 'n' signifies the energy level or shell of an electron in an atom. It is a positive integer (n = 1,2,3,). Higher 'n' means higher energy and bigger orbital radius.

Explanation: Energy levels of an atom are quantised, and 'n' labels these discrete energy levels derived from solving the Schrödinger equation.

Question 2: Enunciate the Pauli Exclusion Principle.

Answer: No two electrons in an atom can share the same set of all four quantum numbers (n, l, m, s). Thus, every electron possesses a distinct quantum state.

Explanation: This principle accounts for the structure of electrons in different orbitals and is responsible for the basis of the periodic table structure.

Question 3: Enunciate the Heisenberg Uncertainty Principle.

Answer: It says that it is not possible to measure at the same time a particle's precise position (x) and momentum (p) precisely. Mathematically, ΔxΔp≥ 2/ℏ.

Explanation: It emphasises the central measurement limit in quantum mechanics.

Check out more such solved sample questions on Quantum Theory for JENPAS UG 2025 in the PDF given below:

List of Important Concepts in Quantum Theory for JENPAS UG 2025

• Applications in Modern Physics: Examples such as lasers, electron microscopes, and semiconductor devices.
• Photoelectric Effect: Description and numerical problems are quite frequently asked in admission exams.
• Compton Effect: Quantum concepts of scattering of photons and their applications in the identification of the particle nature of light.
• Heisenberg's Uncertainty Principle: Quantum mechanical limitations of measurements.
• Atomic Models: Emphasis on Bohr's model, success, and failure.
• Wave-particle Duality: De Broglie wavelength and its application in microscopic systems.
• Dual Nature of Matter and Radiation: Familiarity with how particles can also be described in terms of wave-like features.
• Planck's Quantum Theory: Quantised states of energy and how it is used.

Tips for Solving Quantum Questions in JENPAS UG 2025

• Begin every question by remembering the key equations utilised in quantum physics, i.e., E=hv, λ=h/mv, and the photoelectric equation K.E.=hv−W.
• Time management is a big thing! The Physics section in the JENPAS UG exam usually has 20 questions, so don't spend more than 4 to 5 minutes on a question to remain quick and accurate.
• Keep in mind some useful constants like Planck's constant, the velocity of light, and the mass of an electron.
• Use dimensional analysis to check complicated answers in seconds.
• Do not do unit conversions. Convert the wavelength to meters, the frequency to Hertz, and the energy to Joules or electron volts, as in the question.
• Solve a plethora of numerical problems, as nearly 60 to 65% of Physics problems in competitive examinations test numerical accuracy.
• For theory problems, focus on fundamental concepts like threshold frequency, quantisation of energy, and wave-particle duality.

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