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## In single-mode fibres, the cladding diameter must be at least

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In single-mode fibres, the cladding diameter must be at least 1) Five times the core diameter 2) Thrice the core diameter 3) Ten times the core diameter 4) Twice the core diameter

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## In a PN junction the potential barrier is due to the charges on either side of the junction, these charges are

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In a PN junction the potential barrier is due to the charges on either side of the junction, these charges are 1) Majority carriers 2) Minority carriers 3) Fixed donor and accepter ions 4) Both (a) and (b) ...

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## Number of secondary electrons emitted per number of primary electrons depends on

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Number of secondary electrons emitted per number of primary electrons depends on 1) Material of target 2) Frequency of primary electrons 3) Intensity 4) None of the above

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## In a diode, when there is saturation current, the plate resistance is

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In a diode, when there is saturation current, the plate resistance is 1) Zero 2) Infinite 3) Some finite quantity 4) Data is insufficient

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## For a common base configuration of PNP transistor Ic/IE = 0.98 then the maximum current gain in common emitter configuration will be _______.

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For a common base configuration of PNP transistor Ic/IE = 0.98 then the maximum current gain in common emitter configuration will be _______. 1) 6 2) 12 3) 18 4) 24

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Enlightened

## Question 8: NCERT Solutions for 12th Class Physics: Chapter 15-Communication Systems

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Question 8: NCERT Solutions for 12th Class Physics: Chapter 15-Communication Systems Due to economic reasons, only the upper side band of an AM wave is transmitted, but at the receiving station, there is a facility for generating the carrier. ...

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Enlightened

## Question 7: NCERT Solutions for 12th Class Physics: Chapter 15-Communication Systems

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Question 7: NCERT Solutions for 12th Class Physics: Chapter 15-Communication Systems For an amplitude modulated wave, the maximum amplitude is found to be 10 V while the minimum amplitude is found to be 2 V. Determine the modulation index, ...