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NEET Practice Questions (MCQs) with Answers & Solutions

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A T.V. tower has a height 200 m. By how much the height of tower be increased to triple its coverage range ?

A. 1600 m B. 800 m C. 1800 m D. 600 m

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In short wave communication wave of which of the following frequencies will be reflected back by the ionospheric layer having electron density $ 1.23 \times 10^{12}$ m

A. 2MHz B. 10MHz C. 12MHz D. 18MHz

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What is the frequency range of signals that can be transmitted in care of twisted pair of wires ?

A. 5MHz to 20 MHz B. 5MHz to 10 MHz C. 100MHz to 4 MHz D. 5MHz to 20 MHz

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What type of medium is used in optical communication ?

A. guided medium B. Unguided medium C. Both guided and unguided media D. Neither guided nor unguided media

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The maximun electron density of a layer of the ionosphere is $ 9 \times 10 ^{12} m^ {-3}$ frequency of this layer is

A. 9MHz B. 6MHz C. 3MHz D. 3GHz

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Which condition is to be satisfied in an AM detector circuit so that the signal corresponds to an en.... of the carrier wave

A. $ T_e \lt \lt RC $ B. $ T_e \gt \gt RC $ C. $ F_e \lt \lt RC $ D. $ {1 \over f_n} \lt \lt RC $

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The transmission of audio signal in radio broadcasting is type.

A. ASK B. FSK C. AM D. FM

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Transmission loss per km in the optical fibre, ured presently is

A. 20 dB B. 2 dB C. 0.2dB D. 0.02dB

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If a radio receiver amphifier all the signal frequencies equally well, it is said to have high

A. fidality B. distortion C. sensibility D. sensitivity

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In frequency modulation

A. the amplitude of modulated wave varies as frequency of carrier wave. B. the frequency of modulated wave varies as amplitude of modulating wave C. The amplitude of modulated wave varies as amplitude of carrier wave. D. The frequency of modulated wave varies as frequency of modulating wave.

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