Prabodh Physics Class 12. We covered all the Prabodh Physics Class 12 in this post for free so that you can practice well for the exam.
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Prabodh Physics Class 12 MCQs for Students
In the interference experiment with a biprism, the distance of the slits from the screen is increased by 10% and the separation of the slits is decreased by 20%. The percentage change in fringe width is :
(A) 25%
(B) 30%
(C) 37.5%
(D) 62.5%
Option c – 37.5%
In Young’s experiment, the angular width of a fringe formed on a distant screen is 2°. The wavelength of light used is 6500 A°. The spacing between the slits is approximate:
(A) 1.862 mm
(B) 18.62 mm
(C) 0.1862 mm
(D) 0.01862 mm
Option d – 0.01862 mm
A beam of light of wavelength 600nm from a distant source falls on a single slit 1mm wide and the resulting diffraction pattern is observed on a screen 2m away. The distance between the first dark fringes on either side of the central bright fringe is :
(A) 24 mm
(B) 2.4 mm
(C) 1.2 mm
(D) 12 mm
Option b – 2.4 mm
A point is situated at 8.55 cm and 8.7 cm from two sources. The nature of illumination at that point, if the wavelength of light is 6000 Aº, will be :
(A) Dark
(B) Bright
(C) Neither bright nor dark
(D) Both (A) and (B)
Option b – Bright
In Fraunhofer diffraction, due to a single slit, the light used is of wavelength 6000 A°. If the direction in which the fifth dark band occurs makes an angle of 6° 54′ with the plane of the slit, the width of the slit is :
(A) 2.5 cm
(B) 0.5 mm
(C) 0.25 mm
(D) 0.025 mm
Option d – 0.025 mm
The limit of resolution of a microscope that has a numerical aperture of the objective 0.12 will be (λ = 5800 A°) :
(A) 4 µm
(Β) 2.416 μm
(C) 3.416 μm
(D) 6 μm
Option b – 2.416 μm
In a biprism experiment, the slit is illuminated with light of wavelength 5000 A°. How many fringes will pass a point on the screen, if the path difference is altered by 0.05 mm?
(A) 10
(B) 100
(C) 5
(D) 50
Option b – 100
In a biprism experiment, 60 fringes are observed with sodium light of wavelength 6000 A°. Keeping the same arrangement, if sodium light is replaced by the green light of wavelength 5000 Aº, how many fringes will be then observed?
(A) 67
(B) 69
(C) 72
(D) 74
Option c – 72
For the same angle of incidence, the angles of refraction in media ‘P’, ‘Q’, ‘R’, and ‘S’ are 50°, 40°, 30°, and 20° respectively. The speed of light is minimum in medium :
(A) P
(B) Q
(C) R
(D) S
Option d – S
Two points separated by a distance of 0.1mm can just be inspected in a microscope when the light of wavelength 6000 A is used. If the light of wavelength 4800 A° is used, the limit of resolution will become :
(A) 0.8 mm
(B) 0.15 mm
(C) 0.08 mm
(D) 0.85 mm
Option c – 0.08 mm
Two interfering beams have intensities in the ratio of 9 : 4. Then, the ratio of maximum to minimum intensity in the interference pattern is :
(A) 9 : 4
(B) 6 : 4
(C) 25 : 1
(D) 5 : 1
Option c – 25 : 1
In Y. E., to obtain interference fringes, the light used consists of two wavelengths 5200 A and 6500 A°. The distance between the two slits is 2 mm and the distance between the plane of the slits and the screen is 2 m. What is the least distance from the central bright band, where the bright bands due to the two wavelengths overlap?
(A) 2.6 mm
(B) 1.56 mm
(C) 5.3 mm
(D) 1.6 mm
Option a – 2.6 mm
In a biprism experiment, the slit and eyepiece are 10 cm and 80 cm away from the biprism when a convex lens was interposed at 40 cm from the slit, the separation of two magnified images of the slit was found to be 4 mm, and the distance between two virtual images will be :
(A) 1.6 mm
(B) 2 mm
(C) 3.2 mm
(D) 5 mm
Option c – 3.2 mm
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