Which force has infinite range? A. Weak B. Strong C. Electromagnetic D. Strong nuclear Explanation: EM force acts over infinite distance.
Which principle states particles are indistinguishable? A. Pauli principle B. Superposition principle C. Indistinguishability principle D. Correspondence principle Explanation: Quantum particles of same type are identical.
Which spectral line series lies in visible region for hydrogen? A. Lyman B. Balmer C. Paschen D. Brackett Explanation: Balmer series transitions produce visible light.
Which law defines entropy change in irreversible processes? A. First law B. Second law C. Third law D. Zeroth law Explanation: Entropy increases in irreversible processes.
In thermodynamics, the Helmholtz free energy is minimized at constant: A. Pressure and temperature B. Volume and temperature C. Volume and entropy D. Pressure and entropy Explanation: Helmholtz free energy applies to constant T and V systems.
The Compton wavelength is inversely proportional to: A. Charge B. Mass C. Velocity D. Frequency Explanation: (\lambda = h/mc), inversely dependent on mass.
Which conservation law arises from rotational symmetry? A. Energy B. Linear momentum C. Angular momentum D. Charge Explanation: Noether’s theorem links rotational symmetry to angular momentum conservation.
The Schwarzschild radius depends on which parameter? A. Charge only B. Angular momentum only C. Mass of object D. Temperature Explanation: Event horizon radius is proportional to mass.
In quantum electrodynamics, the interaction between charged particles is mediated by: A. Gluons B. Photons C. Gravitons D. W bosons Explanation: Electromagnetic interactions occur via exchange of virtual photons.