## Wave Optics Quiz-8

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.

Q71. The phase difference between incident wave and reflected wave is 180° when light ray
•  Enters into glass from air
•  Enters into air from glass
•  Enters into glass from diamond
•  Enters into water from glass
Solution
When light reflects from denser surface phase change of Ï€ occurs

Q72.In Young’s double slit experiment, a glass plate is placed before a slit which absorbs half the intensity of light. Under this case
•  The brightness of fringes decreases
•  The fringe width decreases
•  No fringes will be observed
•  The bright fringes become fainter and the dark fringes have finite light intensity
Solution
The bright fringes become fainter and the dark fringes have finite light intensity

Q73.  Wavefront means
•  All particles in it have same phase
•   All particles have opposite phase of vibrations
•  Few particles are in same phase, rest are in opposite phase
•  None of these
Solution
Wavefront is the locus of all the particles which vibrates in the same phase

Q74. The average magnetic energy density of an electromagnetic wave of wavelength Î» travelling in free space is given by
•  B2/2Î»
•  B2/(2Î¼0 )
•  (2B2)/(Î¼0 Î»)
•  B/(Î¼0 Î»)
Solution
B2/(2Î¼0 )

Q75.A ray of light strikes a glass plate at an angle of60°. If the reflected an refracted rays are perpendicular to each other, the index of refraction of glass is
•  1/2
•  √(3/2)
•  3/2
•  1.732
Solution
As reflected and refracted rays are perpendicular to each other, therefore, ip=i=60° Î¼=tan⁡ip=tan⁡60°=√3=1.732

Q76. An electromagnetic wave going through vacuum is described by E=E0sin⁡(kx-Ï‰t);B=B0sin⁡(kx-Ï‰t). Which of the following equations is true
•  E0 k=B0 Ï‰
•  E0 Ï‰=B0 k
• E0 B0=Ï‰k
•  None of these
Solution

Q77.In Young’s double slit experiment we get 60 fringes in the field of view of monochromatic light of wavelength 4000â„«. If we use monochromatic light of wavelength 6000 â„«, then the number of fringes obtained in the same field of view are
•  60
•  90
•  40
•  1.5
Solution

Q78.An unpolarised beam of intensity I0 is incident on a pair of nicols making an angle of 60° with each other. The intensity of light emerging from the pair is
•  I0
•  I0/2
•  I0/4
•  I0/8
Solution

Q79.What is ozone hole
•  Hole in the ozone layer
•  Formation of ozone layer
•  Thinning of ozone layer in troposphere
•  Reduction in ozone thickness in stratosphere
Solution
Ozone hole is depletion of ozone layer in stratosphere because of gases like CFC’S etc

Q80. According to Section 138 of the Negotiable Instruments Act (1881), the dishonour of cheque is considered to be:
•  X-rays and light waves
•  Cosmic rays and sound waves
•  Beta rays and sound waves
• Alpha rays and sound waves
Solution
X-rays and light waves

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