Basic Science : Television QUESTIONS AND ANSWERS :: part1 : 16 to 20
Following Basic Science multiple choice objective type questions and answers will help you in many types of 2024 job and other entrance examinations :
16.Interlaced scanning is used, in order to |
| increase the brightness of image |
| decrease the brightness of image |
| avoid flickering of image |
| increase the contrast in the image |
17.A blanking pulse is |
| a horizontal positive potential applied to the horizontal deflector plates |
| a high positive potential applied to the vertical deflector plates |
| a high negative potential applied to the control grid |
| a high negative potential applied to the filament |
18.The mosaic in an iconoscope |
| consists of a large number of minute globules of caesium compound on one side of a thick mica sheet |
| is coated with a low work function material such as caesium oxide |
| is coated with zinc sulphide to produce fluorescence |
| is coated with barium platino cynide to produce fluorescence |
19.In a TV receiver, the blanking pulses are fed to |
| the horizontal deflector plates |
| the vertical deflector plates |
| the control grid of the electron gun the cathode |
| the cathode |
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