Stalin Malhotra Physics Class 9. We covered all the Stalin Malhotra Physics Class 9 in this post for free so that you can practice well for the exam.
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Stalin Malhotra Physics Class 9 MCQs for Students
Lloyd’s mirror is used to produce two sources which are
(A) monochromatic
(B) coherent
(C) polarized
(D) linear
Option b – coherent
In a biprism experiment, the light of wavelength 5200 Aᵒ is used to get interference patterns on a screen. Fringe width changes by 1.3 mm when the screen is brought towards the biprism by 50 cm. The distance between the virtual images of the slit will be :
(A) 3mm
(B) 2mm
(C) 0.3mm
(D) 0.2mm
Option d – 0.2mm
In Young’s experiment fringe width is 0.4 mm when the eyepiece is at a distance of 1m away from the slit. The change in fringe width if the eyepiece is moved through a distance of 25 cm towards the biprism :
(A) 0.3 mm
(B) 0.1 mm
(C) 0.5 mm
(D) 1 mm
Option b – 0.1 mm
In a biprism experiment, the eyepiece is kept at a distance of 1.5m from the slit. The distance of the second dark band from the central is 1.2 mm. The size of magnified and diminished images of the slits produced by the convex lens is found to be 2.4 mm and 0.6 mm respectively. The wavelength of light used is :
(A) 5400 A°
(B) 4400 A°
(C) 6400 A°
(D) 5900 A°
Option c – 6400 A°
In the biprism experiment, the fringe width is 0.58 mm when the eyepiece is at 1 m from the slit. A convex lens is now placed between the biprism and the eyepiece at a distance of 60 cm from the eyepiece, the distance between the two virtual images was found to be 1.5 mm. The wavelength of light used is :
(A) 2800 Aº
(B) 3795 A°
(C) 5800 Aº
(D) 6800 Aº
Option c – 5800 Aº
In a Fresnel biprism experiment, the two positions of the lens give separation between the slits is 16mm and 9 mm respectively. What is the actual distance of separation?
(A) 144 mm
(B) 16/9 mm
(C) 9/10 mm
(D) 12 mm
Option d – 12 mm
In a biprism experiment, the distance between the slit and the screen is 1m and the distance between the slits is 0.3mm. If λ = 5400 A, the distance between the center of a bright band and the center of an adjacent dark band is :
(A) 0.9 mm
(B) 0.18 mm
(C) 1.8 mm
(D) 9 mm
Option a – 0.9 mm
In a biprism experiment, the distance between the slit and screen is 0.8m and λ = 5400 A°. If the distance of the fifth dark band from the central bright band is 2.16 mm, what is the distance between the two virtual images of the slit formed by the biprism?
(A) 0.9 mm
(B) 0.18 mm
(C) 1.8 mm
(D) 9 mm
Option a – 0.9 mm
In a biprism experiment, the distance between the slit and biprism is 10 cm and the distance between two virtual images of the slit is 1 mm. If the fringe width is 0.54 mm, the distance of the eyepiece from the biprism will be (λ = 5400 A°) :
(A) 1m
(B) 10 cm
(C) 90 cm
(D) 9m
Option c – 90 cm
In a biprism experiment, the distance of the 30th bright band from the center of the interference pattern is 12 mm. The distance of the 20th bright band from the central bright band will be :
(A) 4 mm
(B) 8 mm
(C) 12 mm
(D) 14 mm
Option b – 8 mm
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