260. In negative transission polarity, brighter parts have
A. smaller amplitudes
B. larger amplitudes
C. negligible amplitudes
D. none of these

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261. In positive transmission polarity, blacker parts have
A. smaller amplitudes
B. larger amplitudes
C. zero amplitude
D. none of these

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262. Line blanking period is
A. equal to the horizontal retrace
B. slightly greater than the horizontal retrace
C. slightly less than the horizontal retrace
D. none of these

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263. If there is only, vertical scanning, result is
A. reduced width
B. reduced height
C. a vertical line
D. a horizontal line

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264. The purpose of blanking pulses is to
A. ensure a unifortn scanning rate
B. avoid flickering effect
C. make the retraces invisible
D. none of these

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265.  Wavelength of 440 nm in Armstrongs is
A. 440 x 102
B. 440 x 108
C.4400
D. none of these

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266. Colour represented by 520 nm is approximately
A. green
B. red
C. blue
D. violet

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