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Ray Optics And Optical Instruments Quiz-3

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 


Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 



Q21. Consider the following two statements A and B and identify the correct choice in the given answers A: Line spectra is due to atoms in gaseous state B: Band spectra is due to molecules
  •  Both A and B are false
  •  A is true and B is false
  •  A is false and B is true
  •  Both A and B are true
Solution
Line and band spectrum are also known as atomic and molecular spectra respectively

Q22.A person suffering from ‘presbyopia’ (myopia and hyper metropia both defects) should use
  •  A concave lens
  •  A convex lens
  •  A bifocal lens whose lower portion is convex
  •  A bifocal lens whose upper portion is convex
Solution
A bifocal lens consist of both convex and concave lenses with lower part is convex

Q23.  A man having height 6 m, observes image of 2 m height erect, then mirror used is
  •  Concave
  •  Convex
  •  Plane
  •  None of the above
Solution
When an object is placed in front of convex mirror, then for all positions of object, convex mirror forms erect and diminished image of that object. So, it is obvious that man seeing his image shorter than his height uses convex mirror.

Q24. An object is viewed through a compound microscope and appears in focus when it is 5 mm away from the objective lens. When a sheet of transparent material 3 mm thick is placed between the objective and the microscope, the objective lens has to be moved 1 mm to bring the object back into the focus. The refractive index of the transparent material is
  •  1.5
  •  1.6
  •  1.8
  •  2.0
Solution
                       



Q25.The Cauchy’s dispersion formula is
  •  n=A+Bλ-2+Cλ-4
  •  n=A+Bλ2+Cλ-4
  •  n=A+Bλ-2+Cλ4
  •  n=A+Bλ2+Cλ4
Solution
  n=A+Bλ-2+Cλ-4

Q26. A light ray is incident upon a prism in minimum deviation position and suffers a deviation of 34°. If the shaded half of the prism is knocked off, the ray will
                                                 

  •  Suffer a deviation of 34°
  • Suffer a deviation of 68°
  •  Suffer a deviation of 17°
  •  Not come out of the prism
Solution
                       

       

Q27.An object is puts at a distance of 5 cm from the first focus of a convex lens of focal length 10 cm. If a real image is formed, its distance from the lens will be
  •  0.1 s
  •  0.5 s
  •  10 s
  •  15s
Solution
0.1 s

Q28.An object is placed at a distance of 10cm from a convex lens of power 5D. Find the position of the image
  •  -20 cm
  •  30 cm
  •  20 cm
  •  -30 cm
Solution
                               



Q29.If eye is kept at a depth h inside water of refractive index and viewed outside, then the diameter of the circle through which the outer objects become visible, will be
  •  

  •  

  •  

  •  

Solution
                       



Q30. Magnification at least distance of distinct vision of a simple microscope having its focal length 5 cm is
  •  2
  •  4
  • 5
  •  6
Solution
                         


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