JEE Main 2023 (Online) 8th April Evening Shift | Communication Systems Question 9 | Physics | JEE Main - ExamSIDE.com

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1

JEE Main 2023 (Online) 8th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

The power radiated from a linear antenna of length $$l$$ is proportional to

(Given, $$\lambda=$$ Wavelength of wave):

A

$$\left(\frac{l}{\lambda}\right)^{2}$$

B

$$\frac{l}{\lambda^{2}}$$

C

$$\frac{l^{2}}{\lambda}$$

D

$$\frac{l}{\lambda}$$

2

JEE Main 2023 (Online) 8th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A TV transmitting antenna is $$98 \mathrm{~m}$$ high and the receiving antenna is at the ground level. If the radius of the earth is $$6400 \mathrm{~km}$$, the surface area covered by the transmitting antenna is approximately:

A

$$4868 \mathrm{~km}^{2}$$

B

$$1240 \mathrm{~km}^{2}$$

C

$$3942 \mathrm{~km}^{2}$$

D

$$1549 \mathrm{~km}^{2}$$

3

JEE Main 2023 (Online) 6th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

For an amplitude modulated wave the minimum amplitude is $$3 \mathrm{~V}$$, while the modulation index is $$60 \%$$. The maximum amplitude of the modulated wave is:

A

5 V

B

12 V

C

10 V

D

15 V

4

JEE Main 2023 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

By what percentage will the transmission range of a TV tower be affected when the height of the tower is increased by $$21 \%$$ ?

A

12%

B

15%

C

10%

D

14%

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