Wave-Optics-Quiz-6

Wave Optics Quiz-6

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. 

Q51. Two waves having the intensities in the ratio of 9:1 produce interference. The ratio of maximum to minimum intensity is equal to

•  10:1
•  9:1
•  4:1
•  2:1

Solution
                            

Q52.If the intensities of the two interfering beams in Young’s double alit experiment be I₁ and I₂, then the contrast between the maximum and minimum intensity is good when

•  I₁ is much greater than I₂
•  I₁ is much smaller than I₂
•  I₁= I₂
•  Either I₁=0 or I₂=0

Solution
For maximum contrast, I₁=I₂

Q53.  A wave is propagating in a medium of electric dielectric constant 2 and relative magnetic permeability 50. The wave impedance of such a medium is

•   376.6 Ω
•  5 Ω
•  1883 Ω
•  3776 Ω

Solution
                         

Q54. Consider the following statements about electromagnetic waves and choose the correct ones
S1 : Electromagnetic waves having wavelengths 1000 times smaller than light waves are called X-rays
S2 : Ultraviolet waves are used in the treatment of swollen joints
S3 : Alpha and gamma rays are not electromagnetic waves
S4 : de Broglie waves are not electromagnetic in nature
S5 : Electromagnetic waves exhibit polarization while sound waves do not

•  S1, S4 and S5
•  S3, S4, and S5
•  S1, S3 and S5
•  S2, S3 and S4

Solution
S1, S4 and S5

Q55.A Young’s double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

•  Hyperbola
•  Circle
•  Straight line
•  Parabola

Solution
 Parabola

Q56. In a Fraunhofer diffraction experiment at a single slit using a light of wavelength 400 nm, the first minimum is formed at an angle of 30°. The direction θ of the first secondary maximum is given by

•  sin^-1(2/3)
•  sin^-1(3/4)
• sin^-1⁡(1/4)
•  tan^-1(2/3)

Solution
                         

Q57.V_o and V_E represent the velocities, μ_o and μ_E the refractive indices of ordinary and extraordinary rays for a doubly refracting crystal. Then

•  V_o≥V_E,μ_o≤μ_E if the crystal is calcite
•  V_o≤V_E,μ_o≤μ_E if the crystal is quartz
•  V_o≤V_E,μ_o≥μ_E if the crystal is calcite
•  V_o≥V_E,μ_o≥μ_E if the crystal is quartz

Solution
In double refraction light rays always splits into two rays (O-ray & E-ray). O-ray has same velocity in all direction but E-ray has different velocity in different direction For calcite μ_e<μ₀⇒v_e>v₀ For quartz μ_e>μ₀⇒v₀>v_e

Q58.To demonstrate the phenomenon of interference we require two sources which emit radiations of

•  Nearly the same frequency
•  The same frequency
•  Different wavelength
•  The same frequency and having a definite phase relationship

Solution
The same frequency and having a definite phase relationship

Q59.In Young’s double slit experiment, first slit has width four times the width of the second slit. The ratio of the maximum intensity to the minimum intensity in the interference fringe system is

•  2 : 1
•  4 : 1
•  9 : 1
•  8 : 1

Solution
                   

Q60. Which of the following waves have the maximum wavelength

•  X-rays
•  I.R. rays
• UV rays
•  Radio waves

Solution
λ_Radiowave>λ_{IR rays}>λ_{UV rays}>λ_X-rays