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197 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
141	A ray passes through an equilateral prism at minimum deviation. What is the angle of refraction at the first …	Physics Prism	Medium
142	A thin prism of angle 6° has refractive indices 1.66 for violet and 1.64 for red. What is the angular dispers…	Physics Prism	Hard
143	Why does the objective of an astronomical telescope have a large aperture?	Physics Optical instruments	Easy
144	A convex lens of focal length 5 cm is used as a simple microscope with the image formed at the near point (25…	Physics Optical instruments	Easy
145	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
146	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
147	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
148	According to Huygens' principle, each point on a wavefront:	Physics Wave optics	Easy
149	Two coherent light waves reach a point with a path difference of 3λ/2. What is observed there?	Physics Wave optics	Easy
150	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
151	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
152	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
153	On a graph of stopping potential V₀ against frequency ν for a photocell, the slope of the straight line equal…	Physics Photoelectric effect	Easy
154	Light of frequency below the threshold frequency falls on a metal. What happens if its intensity is increased…	Physics Photoelectric effect	Easy
155	In a photoelectric experiment the frequency is kept fixed above threshold and the intensity is doubled. What …	Physics Photoelectric effect	Medium
156	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
157	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
158	The de Broglie wavelength of a particle of momentum p is:	Physics Matter waves	Easy
159	If the momentum of an electron is doubled, its de Broglie wavelength becomes:	Physics Matter waves	Easy
160	What is the de Broglie wavelength of an electron accelerated from rest through 100 V?	Physics Matter waves	Medium