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New Millennium Physics Class 9. We covered all the New Millennium Physics Class 9 in this post for free so that you can practice well for the exam.
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Millennium Physics Class 9 mcqs for Students
The biprism experiment was first SET up by which scientist?
a) Fresnel
b) Young
c) Huygens
d) Maxwell
Option a – Fresnel
In a biprism experiment, to determine the separation between the two virtual sources, the convex lens should be placed between:
a) The slit and the eyepiece
b) The slit and the biprism
c) The biprism and the eyepiece
d) Any position along the axis
Option c – The biprism and the eyepiece
The separation between the two coherent sources in a biprism experiment cannot be measured directly because the sources are:
a) Virtual coherent sources
b) Virtual incoherent sources
c) Real coherent sources
d) One real and one virtual source
Option a – Virtual coherent sources
In Young’s double-slit experiment, one slit is covered with a glass plate of refractive index 1.5 and the other with an equally thick plate of refractive index 1.6. After removing both plates, ten bright fringes are observed to cross the reference point. If Light of wavelength 6000 Å is used, what is the thickness of each glass plate?
a) 60 microns
b) 70 microns
c) 80 microns
d) 90 microns
Option a – 60 microns
In a biprism experiment, the distance between the slit and the biprism is 20 cm, while the distance between the biprism and the eyepiece is 80 cm. Light of wavelength 6000 Å is used. If each refracting angle of the biprism is 1° 30′ and the refractive index of the prism material is 1.52, what is the fringe width formed in the focal plane of the eyepiece?
a) 0.01 mm
b) 0.11 mm
c) 0.22 mm
d) 0.33 mm
Option b – 0.11 mm
A parallel beam of Light with wavelength 600 nm from a distant source falls on a single slit of width 1 mm. The Diffraction pattern is observed on a screen placed 2 m away. What is the distance between the first dark fringes on either side of the central maximum?
a) 1.2 cm
b) 2.4 cm
c) 1.2 mm
d) 2.4 mm
Option b – 2.4 cm
A biprism is constructed using:
a) Two thick prisms
b) Two thin prisms
c) One thin prism and one thick prism
d) Prisms of unequal thickness
Option b – Two thin prisms
The distance between two points A and B in air is 10 cm. When a glass plate of thickness 0.1 mm is placed between them, the optical path length becomes 10.005 cm. What is the refractive index of the glass?
a) 1.3
b) 1.4
c) 1.5
d) 1.6
Option c – 1.5
In Young’s double-slit experiment, one slit is covered by a glass plate of refractive index 1.58. As a result, the reference point shifts from the central bright fringe to the fifth bright fringe. If the wavelength of Light used is 5800 Å, what is the thickness of the glass plate?
a) 2 μm
b) 3 μm
c) 4 μm
d) 5 μm
Option d – 5 μm
In an interference pattern, what is the distance between the midpoint of the fifth dark fringe on one side of the central bright fringe and the fifth dark fringe on the opposite side?
a) 4.5 times the fringe width
b) 9.5 times the fringe width
c) 9 times the fringe width
d) 10 times the fringe width
Option c – 9 times the fringe width
The central bright fringe produced by Light of wavelength 6000 Å shifts to the position of the fourth bright fringe after introducing a glass plate of refractive index 1.5 in the path. What is the thickness of the glass plate?
a) 7.8 μm
b) 4.8 μm
c) 3.5 μm
d) 1.5 μm
Option b – 4.8 μm
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