This chapter is currently out of syllabus
1
JEE Main 2016 (Offline)
+4
-1
Out of Syllabus
Choose the correct statement :
A
In amplitude modulation the amplitude of the high frequency carrier wave is make to vary in proportion to the amplitude of the audio signal.
B
In amplitude modulation the frequency of the high frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.
C
In frequency modulation the amplitude of the high frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.
D
In frequency modulation the amplitude of the high frequency carrier wave is made to vary in proportion to the frequency of the audio signal.
2
JEE Main 2015 (Offline)
+4
-1
Out of Syllabus
A signal of $$5$$ $$kHz$$ frequency is amplitude modulated on a carrier wave of frequency $$2$$ $$MHz.$$ The frequencies of the resultant signal is/are :
A
$$2005$$ $$kHz, 2000$$ $$kHz$$ and $$1995$$ $$kHz$$
B
$$2000$$ $$kHz$$ and $$1995$$ $$kHz$$
C
$$2$$ $$MHz$$ only
D
$$2005$$ $$kHz$$ and $$1995$$ $$kHz$$
3
AIEEE 2012
+4
-1
Out of Syllabus
A radar has a power of $$1kW$$ and is operating at a frequency of $$10$$ $$GHz.$$ It is located on a mountain top of height $$500$$ $$m.$$ The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth $$= 6.4 \times {10^6}m$$) is :
A
$$80$$ $$km$$
B
$$16$$ $$km$$
C
$$40$$ $$km$$
D
$$64$$ $$km$$
4
AIEEE 2011
+4
-1
Out of Syllabus
This question has Statement - $$1$$ and Statement - $$2$$. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement -$$1$$ : Sky wave signals are used for long distance radio communication. These signals are in general, less stable then ground wave signals.
Statement -$$2$$ : The state of ionosphere varies from hour to hour, day to day and season to season.
A
Statement - $$1$$ is true, Statement - $$2$$ is true, Statement - $$2$$ is the correct explanation of Statement - $$1$$.
B
Statement - $$1$$ is true, Statement - $$2$$ is true, Statement - $$2$$ is not the correct explanation of Statement - $$1$$.
C
Statement - $$1$$ is false, Statement - $$2$$ is true
D
Statement - $$1$$ is true, Statement - $$2$$ is false.
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