## Wave Optics Quiz-6

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
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 Î¸ 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.Vo and VE represent the velocities, Î¼o and Î¼E the refractive indices of ordinary and extraordinary rays for a doubly refracting crystal. Then
•  Vo≥VE,Î¼o≤Î¼E if the crystal is calcite
•  Vo≤VE,Î¼o≤Î¼E if the crystal is quartz
•  Vo≤VE,Î¼o≥Î¼E if the crystal is calcite
•  Vo≥VE,Î¼o≥Î¼E 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 Î¼e<Î¼0⇒ve>v0 For quartz Î¼e>Î¼0⇒v0>ve

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
Solution

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