71. Pick up the correct statement from the following: A. The refractive index of a medium varies according to the wavelength of the radiation B. The variation of the refractive index with wave length, is called dispersion C. The splitting of colors of white light by passing through a prism is caused due to dispersion D. All of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
72. Pick up the correct statement from the following: A. The surface defined by the locus of points having same phase, is called a wave front B. The wave whose surface of constant phase are parallel planes, is known as a plane wave C. The relative phase difference between the waves is important and not the absolute phase of a point on the wave D. All of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
73. Pick up the correct statement from the following: A. Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system B. Topological characteristics of an object are independent of scale measurement C. The three elements of topology are adjacency, containment, and connectivity D. All of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
74. Pick up the correct statement from the following: A. When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed B. When the electric vector is in the plane of incidence, vertical polarisation is formed C. When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed D. All of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
75. 'A time varying electric field produces a magnetic field.' This phenomenon is called: A. Hertz's law B. Ampere Maxwell's law C. Faraday's law D. Kirchoff’s law Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
76. The reflectance from a surface is called specular reflection if it follows: A. Snell’s law B. Lambert C. Planktan D. All of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
77. The maximum sun's radiation occurs around: A. 0.4 μm wave length B. 0.55 μ wave length C. 0.7 μ wave length D. None of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
78. Critical angle of electromagnetic radiation takes place if A. Angle of incidence is equal to angle of refraction B. Angle of incidence is greater than the angle of refraction C. Angle of incidence is equal to 90° D. Angle of refraction is equal to 90° Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
79. The reflection of solar energy is characterized by the water content in the leaf, in the reflective optical infrared: A. Visible (0.4 - 0.7 μm) region B. Near-IR (0.7 - 1.3 μm) region C. Short wave-IR (1.3 - 2.7 μm) region D. None of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
80. Which one the following is a correct statement? A. The vertical section of the soil extending into the parent material, is called profile B. The layers of the soil parallel to the earth surface are called horizons C. The transitional layer between two adjoining horizons is called boundary D. All of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board