Half Yearly Question Paper Class 12 Physics. We covered all the Half Yearly Question Paper Class 12 Physics in this post for free so that you can practice well for the exam.
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Objective Question Paper Class 12 Physics for Students
In the Fraunhofer diffraction slit width ‘a’ is illuminated by the light of wavelength 5400 A°. The value of ‘a’ for the first maxima falls at an angle of diffraction of 30° will be :
(A) 1.62 μm
(Β) 5.4 mm
(C) 3 μm
(D) 10.8 μm
Option a – 1.62 μm
If a single slit Fraunhofer diffraction setup is used with the light of wavelength 4000 A°, the distance x between the central maximum and the first maximum is found to be 3 mm. In the same setup if the wavelength of light used is changed to 6000 Aº, the corresponding value of x will be :
(A) 3 mm
(B) 4.5 mm
(C) 6 mm
(D) 3.5 mm
Option b – 4.5 mm
In single slit diffraction, the second minimum for the light of wavelength 5000 A. U. coincides with the second maximum of some other light. The wavelength of light used is
(A) 4000 A. U.
(B) 5000 A. U.
(C) 5500 A. U.
(D) 6000 A. U.
Option a – 4000 A. U.
When the light of wavelength 6000 A. U. from a distance source falls on a slit 0.6 mm wide. The distance between two dark bands on each side of the central maxima of diffraction pattern observed on a screen placed 1.5 m from the slit is :
(A) 1 mm
(B) 2 mm
(C) 3 mm
(D) 4 mm
Option c – 3 mm
The dablule slit diffraction pattern is decided by
(A) the Diffraction of a single slit and interference between them.
(B) Interference of single slit and diffraction between them
(C) Interference produced by two slits only.
(D) Refraction produced by two slits
Option a – the Diffraction of a single slit and interference between them
Light of wavelength 6280 Aº passes through a single slit and a diffraction pattern is observed on the screen. The angular deflection of the 10th dark band on the side of the central maximum is 3.6°. The slit width will be :
(A) 1 mm
(B) 0.1 mm
(C) 2 mm
(D) 5 mm
Option b – 0.1 mm
The main difference in interference and diffraction is that :
(A) diffraction is due to the interaction of light from the same wavefront whereas interference is the interaction of waves from two isolated sources
(B) diffraction is due to the interaction of light from the wavefront, whereas interference is the interaction of two waves derived from the same source
(C) diffraction is due to the interaction of waves derived from the same source, whereas interference is the bending of light from the same wavefront
(D) there is no difference between interference and diffraction
Option b – diffraction is due to the interaction of light from the wavefront, whereas interference is the interaction of two waves derived from the same source
In order to see diffraction the thickness of the film is :
(A) 100 Aº
(B) 10, 000 Aº
(C) 11 mm
(D) 10 cm
Option b – 10, 000 Aº
A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of width 0.001 mm. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to :
(A) 0°
(B) 30⁰
(C) 15⁰
(D) 60⁰
Option b – 30⁰
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