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#	Question	Subject and topic	Difficulty
5001	An astronomical telescope has an objective of focal length 100 cm and an eyepiece of focal length 5 cm. In no…	Physics Optical instruments	Medium
5002	A compound microscope has an objective of focal length 1 cm, an eyepiece of focal length 2.5 cm and a tube le…	Physics Optical instruments	Medium
5003	A telescope in normal adjustment has a magnifying power of 25 and a tube length of 52 cm. What are the focal …	Physics Optical instruments	Hard
5004	According to Huygens' principle, each point on a wavefront:	Physics Wave optics	Easy
5005	Two coherent light waves reach a point with a path difference of 3λ/2. What is observed there?	Physics Wave optics	Easy
5006	In Young's double-slit experiment, λ = 600 nm, slit separation 0.3 mm and screen distance 1.5 m. What is the …	Physics Wave optics	Medium
5007	The fringe width in a double-slit experiment in air is 4 mm. What is it when the whole apparatus is placed in…	Physics Wave optics	Medium
5008	Light of wavelength 500 nm falls on a single slit of width 0.2 mm. What is the width of the central maximum o…	Physics Wave optics	Hard
5009	On a graph of stopping potential V₀ against frequency ν for a photocell, the slope of the straight line equal…	Physics Photoelectric effect	Easy
5010	Light of frequency below the threshold frequency falls on a metal. What happens if its intensity is increased…	Physics Photoelectric effect	Easy
5011	In a photoelectric experiment the frequency is kept fixed above threshold and the intensity is doubled. What …	Physics Photoelectric effect	Medium
5012	Light of wavelength 310 nm falls on a metal whose work function is 2.5 eV. What is the stopping potential, ap…	Physics Photoelectric effect	Medium
5013	A metal has a work function of 2.0 eV. What is its threshold frequency, approximately? (h = 6.63 × 10⁻³⁴ J s,…	Physics Photoelectric effect	Hard
5014	The de Broglie wavelength of a particle of momentum p is:	Physics Matter waves	Easy
5015	If the momentum of an electron is doubled, its de Broglie wavelength becomes:	Physics Matter waves	Easy
5016	What is the de Broglie wavelength of an electron accelerated from rest through 100 V?	Physics Matter waves	Medium
5017	A cricket ball of mass 0.12 kg moves at 20 m/s. What is its de Broglie wavelength, approximately? (h = 6.63 ×…	Physics Matter waves	Medium
5018	A proton and an alpha particle are each accelerated from rest through the same potential difference. What is …	Physics Matter waves	Hard
5019	In the alpha-particle scattering experiment, most alpha particles passed straight through the gold foil. This…	Physics Atomic models	Easy
5020	What is the energy of the electron in the n = 3 orbit of a hydrogen atom?	Physics Atomic models	Easy