Embibe Experts Solutions for Chapter: Electronic Devices Semiconductors, Exercise 1: JEE Main - 10th January 2019 Shift 2

Match List I with List II

Choose the correct answer from the options given below :

The amplitude of $15\sin \left(1000\mathrm{\pi }t\right)$ is modulated by $10\sin \left(4\mathrm{\pi }t\right)$ signal. The amplitude modulated signal contains frequency (ies) of

$\left(A\right) 500 \mathrm{Hz}$

$\left(B\right) 2 \mathrm{Hz}$

$\left(C\right) 250 \mathrm{Hz}$

$\left(D\right) 498 \mathrm{Hz}$

$\left(E\right) 502 \mathrm{Hz}$

Choose the correct answer from the options given below:

Given below are two statements

Statement I : For transmitting a signal, size of antenna $\left(l\right)$ should be comparable to wavelength of signal (at least $l =\frac{\lambda }{4}$ in dimension).

Statement II : In amplitude modulation, amplitude of carrier wave remains constant (unchanged).

In the light of the above statements, choose the most appropriate answer from the options given below

Given below are two statements:

Statement I : In a typical transistor, all three regions emitter, base and collector have same doping level.

Statement II : in a transistor, collector is the thickest and base is the thinnest segment.

In the light of the above statements, choose the most appropriate answer from the options given below.

Match the List I with List II

Choose the correct answer from the options given below:

Which of the following frequencies does not belong to FM broadcast.

In an amplitude modulation, a modulating signal having amplitude of $X \mathrm{V}$ is superimposed with a carrier signal of amplitude $Y \mathrm{V}$ in first case. Then, in second case, the same modulating signal is superimposed with different carrier signal of amplitude $2Y \mathrm{V}$. The ratio of modulation index in the two case respectively wil be :

Choose the correct statement about Zener diode: