91. Fibre optics work on the principle of
92. What is colour of light related to ?
93. The redness in atmosphere at Sunrise and Sunset is due to :
94. The sky appears blue due to
95. What is a compound microscope?
96. Which one of the following is used for sun glasses ?
97. Instrument for measuring blueness of the sky or ocean is called ________
98. Photosynthesis takes place faster in
99. In a bipolar junction transistor
100. Addition of suitable impurities into semiconductor, is called
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