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NEET Practice Questions (MCQs) with Answers & Solutions

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A 1000 KHz carrier is modulated with 800 KHz audio signals What are the frequencies of first pair side branch ?

A. 1000 KHz and 800 Hz B. 800 Hz and 999.2 KHz C. 1000.8 KHz and 999.2 KHz D. 1000.8 KHz and 1000 KHz

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The critical frequency of Flayer is 50 MHz when angle of incidence is $ 74 ^\circ $ . What is the maximum unable frequency ?

A. 181.5 MHz B. 191.5 MHz C. 199.5 MHz D. 171.5 MHz

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The velocity of e.m. waves in a medium is $ 2.5 \times 10 ^ 8 ms^ {-1}$ what is the dielectric constant of the medium ?

A. 1.2 B. 1.44 C. 0.69 D. 1.6

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How long will it take to transmit the information 30km away in space ?

A. 0.1 ms B. $ 0.1 \Omega s $ C. 0.1 n s D. 0.1 ps

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What is the velocity of electromagnatic wave in a good conductor ?

A. $ 3 \times 10 ^ 8 m/s $ B. $ more than 3 \times 10 ^ 8 m/s $ C. High D. Very low

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If `fm' is the modulation frequency in Fm the modulation index is proportional to

A. $ fm $ B. $ f _m ^2 $ C. $ { 1 \over f_m}$ D. $ { 1 \over f_m^2 } $

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For 100% modulation, What is the value of minimum amplitude $(E_min)$ of the modulated wave ?

A. 0 B. 1 C. 2 D. 3

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When electromagnetic waves enter the ionised layer of ionosphere, the relative permitting of the ionised layer

A. remain constant B. appears to decrease C. appears to increase D. changes randomly

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In which of the following media the wave propagation occurs with out attention ?

A. Conductor B. perfect dielecrei medium C. Semi conductor D. None of the above

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The step index fibre has a relative refractive index difference of 0.86% what is the critical angle at the core cladding interface ?

A. $ 28.4 ^\circ $ B. $ 82.4 ^\circ $ C. $ 24.8 ^\circ $ D. $ 75.6 ^\circ $

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