1
JEE Main 2023 (Online) 1st February Evening Shift
+4
-1

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

A
2 : 1
B
1 : 1
C
4 : 1
D
1 : 2
2
JEE Main 2023 (Online) 1st February Morning Shift
+4
-1

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

A
$$106 ~\mathrm{MHz}$$
B
$$89 ~\mathrm{MHz}$$
C
$$64 ~\mathrm{MHz}$$
D
$$99 ~\mathrm{MHz}$$
3
JEE Main 2023 (Online) 31st January Evening Shift
+4
-1

Given below are two statements :

Statement I : For transmitting a signal, size of antenna ( $l$ ) 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

A
Statement I is incorrect but Statement II is correct
B
Both Statement I and Statement II are correct
C
Both Statement I and Statement II are incorrect
D
Statement I is correct but Statement II is incorrect
4
JEE Main 2023 (Online) 31st January Morning Shift
+4
-1

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

A. $$500 \mathrm{~Hz}$$

B. $$2 \mathrm{~Hz}$$

C. $$250 \mathrm{~Hz}$$

D. $$498 \mathrm{~Hz}$$

E. $$502 \mathrm{~Hz}$$

Choose the correct answer from the options given below:

A
B only
B
A only
C
A, D and E only
D
A and B only
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