JEE Main 2023 (Online) 15th April Morning Shift | Communication Systems Question 1 | Physics

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 $\mathrm{R}=6400 \mathrm{~km})$

$104 \mathrm{~km}$

$56 \mathrm{~km}$

$48 \mathrm{~km}$

$96 \mathrm{~km}$

JEE Main 2023 (Online) 13th April Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

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

$$\frac{\lambda}{2}$$

$$\lambda$$

$$\frac{\lambda}{4}$$

$$2 \lambda$$

JEE Main 2023 (Online) 13th April Morning Shift

MCQ (Single Correct Answer)

-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 - II, B - IV, C - III, D - I

A - II, B-I, C - IV, D - III

A - II, B - IV, C - I, D - III

A - III, B - IV, C - I, D - II

JEE Main 2023 (Online) 12th April Morning Shift

MCQ (Single Correct Answer)

-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 and C only

A and B only

A and D only

A, D and E only

Questions Asked from Communication Systems (MCQ (Single Correct Answer))

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