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Class 12 Physics Book UP Board. We covered all the Class 12 Physics Book UP Board in this post for free so that you can practice well for the exam.
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Class 12 Physics Book UP Board mcqs for Students
In a Fraunhofer Diffraction pattern produced by a single slit of width 0.2 mm using Light of wavelength 5000 Å, what is the half angular width of the central maximum?
a) 30°
b) 5° 9′
c) 9′
d) 36′
Option c – 9′
For a single slit of width 0.05 mm producing a Fraunhofer Diffraction pattern, the fourth minimum is observed at an angle of 2° 40′ with the normal to the slit plane. What is the wavelength of the Light used?
a) 6000 Å
b) 4825 Å
c) 5400 Å
d) 5825 Å
Option d – 5825 Å
Two points on a glass slide subtend a semi-vertical angle of 10° at the objective of a microscope. If the wavelength of Light used is 0.5208 μm and sin 10° = 0.1736, what is the minimum distance between the two points for them to be just resolved?
a) 15 μm
b) 0.15 μm
c) 1.5 μm
d) 1500 μm
Option a – 15 μm
The diameter of a radio telescope generally lies in the range of:
a) centimeter
b) meter
c) kilometer
d) millimeter
Option c – kilometer
A radio telescope is mainly used for observing:
a) stars and measuring their diameters
b) distant stars and planets
c) high-frequency electromagnetic waves
d) the Sun and determining its temperature
Option b – distant stars and planets
The numerical ability of an optical instrument to distinguish between two very close points as separate images is known as its:
a) refractive index
b) limit of resolution
c) resolving power
d) magnification
Option c – resolving power
The resolving power of a microscope can be improved by:
a) increasing the refractive index of the medium between the object and the objective
b) using Light of shorter wavelength
c) using Light of longer wavelength
d) adopting both methods (a) and (b)
Option d – adopting both methods (a) and (b)
The inverse of the smallest angular separation between two distant objects that can be just distinguished is termed the:
a) resolving power of a convex lens
b) resolving power of a biprism
c) resolving power of a microscope
d) resolving power of a telescope
Option d – resolving power of a telescope
The resolving power of a telescope is enhanced by:
a) increasing the diameter of its objective
b) using Light of smaller wavelength
c) reducing the diameter of the objective
d) applying both methods (a) and (b)
Option d – applying both methods (a) and (b)
We covered all the Class 12 Physics book UP Board above in this post for free so that you can practice well for the exam.
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Also, check out:
- GRB Physics Class 12
- Solution of Nootan Physics Class 12
- Previous Year Question Paper Class 12 Physics Bihar Board
