This chapter is currently out of syllabus
1
JEE Main 2023 (Online) 15th April Morning Shift
+4
-1
Out of Syllabus
The height of transmitting antenna is $180 \mathrm{~m}$ and the height of the receiving antenna is $245 \mathrm{~m}$. The maximum distance between them for satisfactory communication in line of sight will be :

(given $\mathrm{R}=6400 \mathrm{~km})$
A
$104 \mathrm{~km}$
B
$56 \mathrm{~km}$
C
$48 \mathrm{~km}$
D
$96 \mathrm{~km}$
2
JEE Main 2023 (Online) 13th April Evening Shift
+4
-1
Out of Syllabus

To radiate EM signal of wavelength $$\lambda$$ with high efficiency, the antennas should have a minimum size equal to:

A
$$\frac{\lambda}{2}$$
B
$$\lambda$$
C
$$\frac{\lambda}{4}$$
D
$$2 \lambda$$
3
JEE Main 2023 (Online) 13th April Morning Shift
+4
-1
Out of Syllabus

Match List - I with List - II

List - I
(Layer of atmosphere)
List - II
(Approximate height over earth's surface)
(A) $$\mathrm{F_1}$$ - Layer (I) 10 km
(B) $$\mathrm{D}$$ - Layer (II) 170 - 190 km
(C) Troposphere (III) 100 km
(D) $$\mathrm{E}$$ - Layer (IV) 65 - 75 km

Choose the correct answer from the options given below:

A
A - II, B - IV, C - III, D - I
B
A - II, B-I, C - IV, D - III
C
A - II, B - IV, C - I, D - III
D
A - III, B - IV, C - I, D - II
4
JEE Main 2023 (Online) 12th April Morning Shift
+4
-1
Out of Syllabus

The amplitude of $$15 \sin (1000 \pi \mathrm{t})$$ is modulated by $$10 \sin (4 \pi \mathrm{t})$$ signal. The amplitude modulated signal contains frequencies 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
A and C only
B
A and B only
C
A and D only
D
A, D and E only
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