JEE Physics Communication System MCQs Set 12

Practice MCQs for JEE Physics Communication System

Access targeted multiple-choice questions for Communication System designed to align with the latest JEE academic syllabus for JEE Physics. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Access Communication System Questions and Solutions

Access the complete set of multiple-choice questions for Communication System below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official JEE textbooks.

Multiple Choice Questions

Question 1: The physical sizes of the transmitter and receiver antennas in a communication system are
(a) inversely proportional to the carrier frequency
(b) proportional to the carrier frequency
(c) inversely proportional to the modulation frequency
(d) independent of both the carrier and the modulation frequency
Show Answer & Explanation

Answer: (a) inversely proportional to the carrier frequency

Explanation:
1. An efficient antenna has a length of the order of the carrier wavelength (typically \( \lambda/4 \)).
2. \( \lambda=\dfrac cf \), so the size is inversely proportional to the carrier frequency.

Teacher's Note:
1. Write the standard relation for modulation index, bandwidth or line of sight, then substitute carefully.
2. Check the units (kHz, MHz, GHz) before comparing the options.

Question 2: To double the covering range of a TV transmission tower, its height should be multiplied by
(a) \( \sqrt2 \)
(b) 4
(c) 2
(d) \( \dfrac1{\sqrt2} \)
Show Answer & Explanation

Answer: (b) 4

Explanation:
1. Range \( d=\sqrt{2Rh}\propto\sqrt h \).
2. Doubling d needs \( h\to4h \).

Teacher's Note:
1. Write the standard relation for modulation index, bandwidth or line of sight, then substitute carefully.
2. Check the units (kHz, MHz, GHz) before comparing the options.

Question 3: A telephonic communication service is working at a carrier frequency of 10 GHz. Only 10% of it is utilised for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of 5 kHz?
(a) \( 2\times10^6 \)
(b) \( 2\times10^3 \)
(c) \( 2\times10^5 \)
(d) \( 2\times10^4 \)
Show Answer & Explanation

Answer: (c) \( 2\times10^5 \)

Explanation:
1. Available bandwidth \( =0.1\times10\times10^9=10^9 \) Hz.
2. Channels \( =\dfrac{10^9}{5\times10^3}=2\times10^5 \).

Teacher's Note:
1. Write the standard relation for modulation index, bandwidth or line of sight, then substitute carefully.
2. Check the units (kHz, MHz, GHz) before comparing the options.

Question 4: Elements with principal quantum number n greater than 4 do not occur in nature. The number of possible elements would be (counting shells up to n = 4 with \( 2n^2 \) electrons each)
(a) 32
(b) 4
(c) 64
(d) 60
Show Answer & Explanation

Answer: (d) 60

Explanation:
1. Electrons per shell: \( 2n^2 \) gives 2, 8, 18 and 32 for n = 1, 2, 3, 4.
2. Total \( =2+8+18+32=60 \).

Teacher's Note:
1. Write the standard relation for modulation index, bandwidth or line of sight, then substitute carefully.
2. Check the units (kHz, MHz, GHz) before comparing the options.

Question 5: Atoms having the same ...... but different ...... are called isotopes. Choose the pair that completes the sentence.
(a) atomic number; mass number
(b) mass number; atomic number
(c) neutron number; atomic number
(d) atomic number; electron number
Show Answer & Explanation

Answer: (a) atomic number; mass number

Explanation:
1. Isotopes are nuclei of the same element, so they have the same number of protons.
2. They differ in the number of neutrons, hence in mass number.

Teacher's Note:
1. Write the standard relation for modulation index, bandwidth or line of sight, then substitute carefully.
2. Check the units (kHz, MHz, GHz) before comparing the options.

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Practice MCQs for JEE Physics Communication System

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FAQs

Where can I access latest JEE Physics Communication System MCQs Set 12?

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Are Assertion-Reasoning and Case-Study MCQs included in the Physics JEE material?

Yes, our JEE Physics Communication System MCQs Set 12 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the JEE paper is now competency-based.

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By solving our JEE Physics Communication System MCQs Set 12, JEE students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Physics.

Do you provide answers and explanations for JEE Physics Communication System MCQs Set 12?

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