51. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
52. Out of the following pairs, which one does not have identical dimension?
53. Mercury is commonly used as a thermometric fluid rather than water because
54. Optical fibre works on the
55. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
56. Supersonic plane fly with the speed
57. Mach number is used in connection with the speed of
58. On a stationary sail boat, air is blown from a fan attached to the boat. The boat
59. Rainbow is due to
60. Stars which appear single to the naked eye but are double when seen through a telescope are
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