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physics 12 light
Pg.No.
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Page 1
Q.1. Which form of energy is propogated as an electomagnetic waves,lies between ultra- violet and infra-red region and has wavelength between 3900 angstrom to 7800 angstrom?
Q.2. Which type of electomagnetic waves are light waves?
Q.3. Which nature of light explains rectilinear propogation,reflection,refraction,interference,diffraction and polarisation of light?
Q.4. Photoelectic effect,Compton effect can be explained on which theory of light?
Q.5. Who proposed the Quantum theory of light?
Q.6. In quantum theory, light is regarded as a packet or bundle of energy which are known as?
Q.7. Who shows dual nature as a wave and particle both?
Q.8. Who first measured the speed of light in 1678 AD?
Q.9. What is the speed of light in vaccum and air?
Q.10. What is the speed of light in water?
Q.11. What is the speed of light in rock salt?
Q.12. What is the speed of light in glass?
Q.13. What is the speed of light in terpentine oil?
Q.14. What is the speed of light in nylon?
Q.15. What is the ratio of speed of light in vaccum{c} to the speed of light in the medium called as?
Q.16. What is the velocity of light in a medium having small refractive index?
Q.17. How much time is taken by the light to reach the earth from the sun?
Q.18. How much time is taken by the light reflected by the moon to reach the earth?
Q.19. Which objects emit light by themselves?
Q.20. Which objects donot emit light themselves but are visible by the light falling on them by other luminous bodies?
Q.21. Name the substances which allows most of the incident light to pass through them?
Q.22. Glass,water are examples of?
Q.23. Name the substances which allows a part of the incident light to pass through them?
Q.24. Oiled paper is an example of?
Q.25. Name the substances which donot allow the incident light to pass through them?
Q.26. Mirror,metal,wood are examples of?
Q.27. Name the phenomenon in which a light ray falls on the boundary separating two media returns back to the first medium?
Q.28. Name the law in which 'the incident ray,reflected ray and normal to the reflecting surface at the incident point all lie in a same line and also the angle of reflection is equal to the angle of incidence'?
Q.29. Which type of image is formed through the reflection from plane mirror?
Q.30. What is the distance and size of image formed from the plane mirror reflection?
Q.31. With what speed the image moves towads or far away,if an object moves towards or far away from the mirror from the speed of v,relative to the object?
Q.32. What will be the angle of rotation of the reflected ray,if a plane mirror is rotated by an angle of 'a',keeping the incident ray fixed?
Q.33. What height of mirror is required to see the full image of a person in a plane mirror?
Q.34. Which type of image is formed by the concave mirror?
Q.35. Which type of image is formed by the convex mirror?
Q.36. Which type of mirrors are used as a shaving glass,reflector for the headlights of the vehicle,search light,in ophthalmoscope to examine eye,ear nose by doctors and in solar cookers?
Q.37. Which type of mirror is used in sodium reflector lamp?
Q.38. Which mirrors provide the maximum rear field view and forms always erect image, used as a rear view mirror in vehicle?
Q.39. Name the phenomenon of changing the direction of propagation of light at the boundary when it passes from one medium to other medium?
Q.40. What is the effect on frequency,phase,wavelength and velocity of light when it enters from one medium to other medium?
Q.41. Name the ratio of speed of light in vaccum to the speed of light in the medium?
Q.42. Name the law which 'the ratio of sine of angle of incidence to the sine of angle of refraction is a constant'?
Q.43. What will be the refractive index of a medium on increasing the wavelength of light?
Q.44. Which colours of light have maximum and minimum refractive indexes?
Q.45. Why stars seems twinkling from earth's surface?
Q.46. Why sun is seen as oval shaped in the morning and the evening?
Q.47. Why an object in denser medium is seen from rarer medium appears to be at a small distance?
Q.48. Why a linear object is seen bending when it is partially dipped in a liquid inclined to the surface of the liquid?
Q.49. Why a fish in a pond appears to be at smaller depth than the actual depth when viewed from the air?
Q.50. Why a coin placed at the base of a vessel filled with water appears to be raised?
Q.51. Name the angle of incidence in a denser medium for which the angle of refraction in rarer medium becomes 90 degree?
Q.52. Name the phenomenon in which the light is reflected back into the denser medium,when it travels from denser medium to rarer medium and angle of incidence is more than the critical angle?
Q.53. Why diamonds sparkle?
Q.54. Why mirage and looming happens?
Q.55. Why air bubbles shine in water?
Q.56. Why sun becomes visible even before sunrise and remains visible even after sunset?
Q.57. Why smoked ball shine or metal ball on which lamp soot is deposited when dipped in water?
Q.58. Opticle fibre works on the principle of?
Q.59. Which apparatus is used for visualizing the internal sites of the body by endoscopy?
Q.60. Which apparatus is used for telecommunication {transmitting optical signals and electrical signals}?
Q.61. Name the section of transparent refractive material of two surfaces of definite geometrical shape of which one surface must be spherical?
Q.62. Which lens is thicker at the middle than at the edges?
Q.63. Which lens is thicker at the edges than in the middle?
Q.64. Name the capacity of lens to deviate a ray?
Q.65. What is measured as the reciprocal of the focal length in meters?
Q.66. Write the SI unit of power of lens?
Q.67. What is the power of convex lens?
Q.68. What is the power of concave lens?
Q.69. What happens to focal length and power of lens if it is dipped in a liquid of smaller refractive index?
Q.70. What happens to focal length and power of lens if it is dipped in a liquid of equal refractive index?
Q.71. What happens to focal length and power of lens if it is dipped in a liquid of higher refractive index?
Q.72. What happens to nature of lens if it is dipped in a liquid of higher refractive index?
Q.73. How an air bubble appears and behaves when it is trapped in water or glass?
Q.74. Which type of image is formed by convex lens?
Q.75. Which type of image is formed by concave lens?
Q.76. Name the phenomenon in which when a ray of white light is passed through the prism,it gets splitted into its constituent colours?
Q.77. Name the coloured pattern obtained on a screen after dispersion of light?
Q.78. What happens due to different deviation suffered by different colours of light?
Q.79. Write the order of different colours appears in the spectrum?
Q.80. Which colour shows maximum deviation?
Q.81. Which colour shows minimum deviation?
Q.82. What will be the refractive index of a medium for violet colour, if the velocity of violet colour of light is minimum for that medium?
Q.83. Name the coloured display in the form of an arc of a circle hanging in the sky observed during or after a drizzle appearing on the opposite side of sun?
Q.84. What is formed due to dispersion of sunlight by the suspended water droplets?
Q.85. Which type of rainbow is formed due to two refractions and one total internal reflection of light falling on the raindrops?
Q.86. Which colours are visible on the convex side and on the concave side of the primary rainbow?
Q.87. What is the average angle of elevation for primary rainbow having an angular width of 2 degree?
Q.88. Which type of rainbow is formed due to two refractions and two internal reflections of light falling on the raindrops?
Q.89. What is the average angle of elevation for secondary rainbow having an angular width of 3.5degree?
Q.90. Which type of rainbow is more intense primary or secondary?
Q.91. Name the sensation perceived by the rods in the eye due to light?
Q.92. The spectral colours red,biue and green are called as?
Q.93. Which colours can be produced by mixing them in proper proportion?
Q.94. Which colour is produced by mixing all primary colours?
Q.95. Which colour can be produced by mixing any two primary colours?
Q.96. Name all the secondary colours?
Q.97. Which colour is produced on mixing green and red colours?
Q.98. Which colour is produced on mixing red and blue colours?
Q.99. Which colour is produced on mixing blue and green colours?
Q.100. Which colour is produced on mixing all three secondary colours?
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