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Previous year question hub

Communication Systems - Modern Physics - Physics Previous Year Questions

Practice Communication Systems - Modern Physics - Physics previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

100Papers
12Years
101Questions
1Topics

Communication Systems question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Communication Systems. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Easy 77 76.2%
Medium 23 22.8%
Hard 1 1%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

Multiple Choices 82 81.2%
Numerical Answer Type (NAT) 19 18.8%

Subject weightage

Top subjects by unique question coverage.

Physics
101 Qs

Most asked topics

Top topics across the included previous year papers.

Modern Physics
101 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Communication Systems
101 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

JEE MAIN 2023 ONLINE 10TH APRIL EVENING SHIFT
1 Qs
JEE MAIN 2023 ONLINE 10TH APRIL MORNING SHIFT
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JEE MAIN 2023 ONLINE 11TH APRIL EVENING SHIFT
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JEE MAIN 2023 ONLINE 11TH APRIL MORNING SHIFT
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JEE MAIN 2023 ONLINE 12TH APRIL MORNING SHIFT
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JEE MAIN 2023 ONLINE 13TH APRIL EVENING SHIFT
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JEE MAIN 2023 ONLINE 13TH APRIL MORNING SHIFT
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JEE MAIN 2023 ONLINE 15TH APRIL MORNING SHIFT
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JEE MAIN 2023 ONLINE 1ST FEBRUARY EVENING SHIFT
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JEE MAIN 2023 ONLINE 1ST FEBRUARY MORNING SHIFT
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JEE MAIN 2023 ONLINE 24TH JANUARY EVENING SHIFT
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JEE MAIN 2023 ONLINE 24TH JANUARY MORNING SHIFT
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JEE MAIN 2023 ONLINE 25TH JANUARY EVENING SHIFT
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JEE MAIN 2023 ONLINE 25TH JANUARY MORNING SHIFT
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JEE MAIN 2023 ONLINE 29TH JANUARY EVENING SHIFT
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JEE MAIN 2023 ONLINE 29TH JANUARY MORNING SHIFT
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JEE MAIN 2023 ONLINE 30TH JANUARY EVENING SHIFT
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JEE MAIN 2023 ONLINE 30TH JANUARY MORNING SHIFT
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JEE MAIN 2023 ONLINE 31ST JANUARY EVENING SHIFT
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JEE MAIN 2023 ONLINE 31ST JANUARY MORNING SHIFT
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JEE MAIN 2023 ONLINE 6TH APRIL EVENING SHIFT
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JEE MAIN 2023 ONLINE 6TH APRIL MORNING SHIFT
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JEE MAIN 2023 ONLINE 8TH APRIL EVENING SHIFT
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JEE MAIN 2023 ONLINE 8TH APRIL MORNING SHIFT
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JEE MAIN 2022 ONLINE 24TH JUNE EVENING SHIFT
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JEE MAIN 2022 ONLINE 24TH JUNE MORNING SHIFT
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JEE MAIN 2022 ONLINE 25TH JULY EVENING SHIFT
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JEE MAIN 2022 ONLINE 25TH JULY MORNING SHIFT
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JEE MAIN 2022 ONLINE 25TH JUNE EVENING SHIFT
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JEE MAIN 2022 ONLINE 25TH JUNE MORNING SHIFT
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JEE MAIN 2022 ONLINE 26TH JULY EVENING SHIFT
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JEE MAIN 2022 ONLINE 26TH JULY MORNING SHIFT
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JEE MAIN 2022 ONLINE 26TH JUNE EVENING SHIFT
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JEE MAIN 2022 ONLINE 26TH JUNE MORNING SHIFT
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JEE MAIN 2022 ONLINE 27TH JULY EVENING SHIFT
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JEE MAIN 2022 ONLINE 27TH JULY MORNING SHIFT
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JEE MAIN 2022 ONLINE 27TH JUNE EVENING SHIFT
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JEE MAIN 2022 ONLINE 27TH JUNE MORNING SHIFT
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JEE MAIN 2022 ONLINE 28TH JULY EVENING SHIFT
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JEE MAIN 2022 ONLINE 28TH JULY MORNING SHIFT
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JEE MAIN 2022 ONLINE 28TH JUNE EVENING SHIFT
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JEE MAIN 2022 ONLINE 28TH JUNE MORNING SHIFT
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JEE MAIN 2022 ONLINE 29TH JULY EVENING SHIFT
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JEE MAIN 2022 ONLINE 29TH JULY MORNING SHIFT
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JEE MAIN 2022 ONLINE 29TH JUNE EVENING SHIFT
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JEE MAIN 2022 ONLINE 29TH JUNE MORNING SHIFT
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JEE MAIN 2022 ONLINE 30TH JUNE MORNING SHIFT
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JEE Main 2021 (Online) 24th February Evening Shift
1 Qs
JEE Main 2021 (Online) 24th February Morning Shift
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JEE Main 2021 (Online) 25th February Evening Shift
1 Qs
JEE Main 2021 (Online) 25th February Morning Shift
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JEE Main 2021 (Online) 26th February Evening Shift
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JEE Main 2021 (Online) 26th February Morning Shift
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JEE MAIN 2021 ONLINE 16TH MARCH EVENING SHIFT
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JEE MAIN 2021 ONLINE 16TH MARCH MORNING SHIFT
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JEE MAIN 2021 ONLINE 17TH MARCH EVENING SHIFT
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JEE MAIN 2021 ONLINE 17TH MARCH MORNING SHIFT
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JEE MAIN 2021 ONLINE 18TH MARCH EVENING SHIFT
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JEE MAIN 2021 ONLINE 18TH MARCH MORNING SHIFT
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JEE MAIN 2021 ONLINE 1ST SEPTEMBER EVENING SHIFT
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JEE MAIN 2021 ONLINE 20TH JULY MORNING SHIFT
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JEE MAIN 2021 ONLINE 22TH JULY EVENING SHIFT
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JEE MAIN 2021 ONLINE 25TH JULY EVENING SHIFT
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JEE MAIN 2021 ONLINE 25TH JULY MORNING SHIFT
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JEE MAIN 2021 ONLINE 26TH AUGUST EVENING SHIFT
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JEE MAIN 2021 ONLINE 26TH AUGUST MORNING SHIFT
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JEE MAIN 2021 ONLINE 27TH AUGUST EVENING SHIFT
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JEE MAIN 2021 ONLINE 27TH AUGUST MORNING SHIFT
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JEE MAIN 2021 ONLINE 27TH JULY EVENING SHIFT
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JEE MAIN 2021 ONLINE 27TH JULY MORNING SHIFT
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JEE MAIN 2021 ONLINE 31ST AUGUST EVENING SHIFT
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JEE MAIN 2021 ONLINE 31ST AUGUST MORNING SHIFT
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JEE MAIN 2020 ONLINE 2ND SEPTEMBER MORNING SLOT
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JEE MAIN 2019 ONLINE 10TH APRIL MORNING SLOT
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JEE MAIN 2019 ONLINE 10TH JANUARY EVENING SLOT
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JEE MAIN 2019 ONLINE 10TH JANUARY MORNING SLOT
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JEE MAIN 2019 ONLINE 11TH JANUARY EVENING SLOT
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JEE MAIN 2019 ONLINE 11TH JANUARY MORNING SLOT
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JEE MAIN 2019 ONLINE 12TH APRIL EVENING SLOT
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JEE MAIN 2019 ONLINE 12TH JANUARY EVENING SLOT
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JEE MAIN 2019 ONLINE 12TH JANUARY MORNING SLOT
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JEE MAIN 2019 ONLINE 8TH APRIL EVENING SLOT
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JEE MAIN 2019 ONLINE 8TH APRIL MORNING SLOT
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JEE MAIN 2019 ONLINE 9TH APRIL EVENING SLOT
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JEE MAIN 2019 ONLINE 9TH APRIL MORNING SLOT
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JEE MAIN 2019 ONLINE 9TH JANUARY EVENING SLOT
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JEE MAIN 2018 OFFLINE
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JEE MAIN 2018 ONLINE 15TH APRIL EVENING SLOT
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JEE MAIN 2018 ONLINE 15TH APRIL MORNING SLOT
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JEE MAIN 2018 ONLINE 16TH APRIL MORNING SLOT
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JEE MAIN 2017 OFFLINE
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JEE MAIN 2017 ONLINE 8TH APRIL MORNING SLOT
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JEE MAIN 2017 ONLINE 9TH APRIL MORNING SLOT
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JEE MAIN 2016 OFFLINE
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JEE MAIN 2016 ONLINE 10TH APRIL MORNING SLOT
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JEE MAIN 2016 ONLINE 9TH APRIL MORNING SLOT
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JEE MAIN 2015 OFFLINE
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AIEEE 2012
1 Qs
AIEEE 2011
1 Qs
AIEEE 2003
1 Qs

Included previous year papers

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PaperYear / sessionQuestions in this viewOpen
JEE MAIN 2023 ONLINE 10TH APRIL EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 10TH APRIL MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 11TH APRIL EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 11TH APRIL MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 12TH APRIL MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 13TH APRIL EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 13TH APRIL MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 15TH APRIL MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 1ST FEBRUARY EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 1ST FEBRUARY MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 24TH JANUARY EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 24TH JANUARY MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 25TH JANUARY EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 25TH JANUARY MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 29TH JANUARY EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 29TH JANUARY MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 30TH JANUARY EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 30TH JANUARY MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 31ST JANUARY EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 31ST JANUARY MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 6TH APRIL EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 6TH APRIL MORNING SHIFT20231View paper
JEE MAIN 2023 ONLINE 8TH APRIL EVENING SHIFT20231View paper
JEE MAIN 2023 ONLINE 8TH APRIL MORNING SHIFT20231View paper
JEE MAIN 2022 ONLINE 24TH JUNE EVENING SHIFT20221View paper
JEE MAIN 2022 ONLINE 24TH JUNE MORNING SHIFT20221View paper
JEE MAIN 2022 ONLINE 25TH JULY EVENING SHIFT20221View paper
JEE MAIN 2022 ONLINE 25TH JULY MORNING SHIFT20221View paper
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JEE MAIN 2022 ONLINE 26TH JULY EVENING SHIFT20221View paper
JEE MAIN 2022 ONLINE 26TH JULY MORNING SHIFT20221View paper
JEE MAIN 2022 ONLINE 26TH JUNE EVENING SHIFT20221View paper
JEE MAIN 2022 ONLINE 26TH JUNE MORNING SHIFT20221View paper
JEE MAIN 2022 ONLINE 27TH JULY EVENING SHIFT20221View paper
JEE MAIN 2022 ONLINE 27TH JULY MORNING SHIFT20221View paper
JEE MAIN 2022 ONLINE 27TH JUNE EVENING SHIFT20221View paper
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JEE MAIN 2022 ONLINE 28TH JULY EVENING SHIFT20221View paper
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JEE MAIN 2022 ONLINE 29TH JUNE MORNING SHIFT20221View paper
JEE MAIN 2022 ONLINE 30TH JUNE MORNING SHIFT20221View paper
JEE Main 2021 (Online) 24th February Evening Shift20211View paper
JEE Main 2021 (Online) 24th February Morning Shift20211View paper
JEE Main 2021 (Online) 25th February Evening Shift20211View paper
JEE Main 2021 (Online) 25th February Morning Shift20211View paper
JEE Main 2021 (Online) 26th February Evening Shift20211View paper
JEE Main 2021 (Online) 26th February Morning Shift20211View paper
JEE MAIN 2021 ONLINE 16TH MARCH EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 16TH MARCH MORNING SHIFT20211View paper
JEE MAIN 2021 ONLINE 17TH MARCH EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 17TH MARCH MORNING SHIFT20211View paper
JEE MAIN 2021 ONLINE 18TH MARCH EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 18TH MARCH MORNING SHIFT20211View paper
JEE MAIN 2021 ONLINE 1ST SEPTEMBER EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 20TH JULY MORNING SHIFT20211View paper
JEE MAIN 2021 ONLINE 22TH JULY EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 25TH JULY EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 25TH JULY MORNING SHIFT20211View paper
JEE MAIN 2021 ONLINE 26TH AUGUST EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 26TH AUGUST MORNING SHIFT20211View paper
JEE MAIN 2021 ONLINE 27TH AUGUST EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 27TH AUGUST MORNING SHIFT20211View paper
JEE MAIN 2021 ONLINE 27TH JULY EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 27TH JULY MORNING SHIFT20211View paper
JEE MAIN 2021 ONLINE 31ST AUGUST EVENING SHIFT20211View paper
JEE MAIN 2021 ONLINE 31ST AUGUST MORNING SHIFT20211View paper
JEE MAIN 2020 ONLINE 2ND SEPTEMBER MORNING SLOT20201View paper
JEE MAIN 2019 ONLINE 10TH APRIL MORNING SLOT20192View paper
JEE MAIN 2019 ONLINE 10TH JANUARY EVENING SLOT20191View paper
JEE MAIN 2019 ONLINE 10TH JANUARY MORNING SLOT20191View paper
JEE MAIN 2019 ONLINE 11TH JANUARY EVENING SLOT20191View paper
JEE MAIN 2019 ONLINE 11TH JANUARY MORNING SLOT20191View paper
JEE MAIN 2019 ONLINE 12TH APRIL EVENING SLOT20191View paper
JEE MAIN 2019 ONLINE 12TH JANUARY EVENING SLOT20191View paper
JEE MAIN 2019 ONLINE 12TH JANUARY MORNING SLOT20191View paper
JEE MAIN 2019 ONLINE 8TH APRIL EVENING SLOT20191View paper
JEE MAIN 2019 ONLINE 8TH APRIL MORNING SLOT20191View paper
JEE MAIN 2019 ONLINE 9TH APRIL EVENING SLOT20191View paper
JEE MAIN 2019 ONLINE 9TH APRIL MORNING SLOT20191View paper
JEE MAIN 2019 ONLINE 9TH JANUARY EVENING SLOT20191View paper
JEE MAIN 2018 OFFLINE20181View paper
JEE MAIN 2018 ONLINE 15TH APRIL EVENING SLOT20181View paper
JEE MAIN 2018 ONLINE 15TH APRIL MORNING SLOT20181View paper
JEE MAIN 2018 ONLINE 16TH APRIL MORNING SLOT20181View paper
JEE MAIN 2017 OFFLINE20171View paper
JEE MAIN 2017 ONLINE 8TH APRIL MORNING SLOT20171View paper
JEE MAIN 2017 ONLINE 9TH APRIL MORNING SLOT20171View paper
JEE MAIN 2016 OFFLINE20161View paper
JEE MAIN 2016 ONLINE 10TH APRIL MORNING SLOT20161View paper
JEE MAIN 2016 ONLINE 9TH APRIL MORNING SLOT20161View paper
JEE MAIN 2015 OFFLINE20151View paper
AIEEE 201220121View paper
AIEEE 201120111View paper
AIEEE 200320031View paper

All Communication Systems previous year questions

Practice every matching question in batches of 20, with every available option.

1
2003 · Physics · Modern Physics · Communication Systems
AIEEE 2003
Consider telecommunication through optical fibres. Which of the following statements is not true?
A
Optical fibres can be of graded refractive index
B
Optical fibres are subject to electromagnetic interference from outside
C
Optical fibres have extremely low transmission loss
D
Optical fibres may have homogeneous core with a suitable cladding.
Open complete paper
2
2011 · Physics · Modern Physics · Communication Systems
AIEEE 2011
This question has Statement - \(1\) and Statement - \(2\). Of the four choices given after the statements, choose the one that best describes the two statements.
Statement -\(1\) : Sky wave signals are used for long distance radio communication. These signals are in general, less stable then ground wave signals.
Statement -\(2\) : The state of ionosphere varies from hour to hour, day to day and season to season.
A
Statement - \(1\) is true, Statement - \(2\) is true, Statement - \(2\) is the correct explanation of Statement - \(1\).
B
Statement - \(1\) is true, Statement - \(2\) is true, Statement - \(2\) is not the correct explanation of Statement - \(1\).
C
Statement - \(1\) is false, Statement - \(2\) is true
D
Statement - \(1\) is true, Statement - \(2\) is false.
Open complete paper
3
2012 · Physics · Modern Physics · Communication Systems
AIEEE 2012
A radar has a power of \(1kW\) and is operating at a frequency of \(10\) \(GHz.\) It is located on a mountain top of height \(500\) \(m.\) The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth \(= 6.4 \times {10^6}m\)) is :
A
\(80\) \(km\)
B
\(16\) \(km\)
C
\(40\) \(km\)
D
\(64\) \(km\)
Open complete paper
4
2015 · Physics · Modern Physics · Communication Systems
JEE MAIN 2015 OFFLINE
A signal of \(5\) \(kHz\) frequency is amplitude modulated on a carrier wave of frequency \(2\) \(MHz.\) The frequencies of the resultant signal is/are :
A
\(2005\) \(kHz, 2000\) \(kHz\) and \(1995\) \(kHz\)
B
\(2000\) \(kHz\) and \(1995\) \(kHz\)
C
\(2\) \(MHz\) only
D
\(2005\) \(kHz\) and \(1995\) \(kHz\)
Open complete paper
5
2016 · Physics · Modern Physics · Communication Systems
JEE MAIN 2016 OFFLINE
Choose the correct statement :
A
In amplitude modulation the amplitude of the high frequency carrier wave is make to vary in proportion to the amplitude of the audio signal.
B
In amplitude modulation the frequency of the high frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.
C
In frequency modulation the amplitude of the high frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.
D
In frequency modulation the amplitude of the high frequency carrier wave is made to vary in proportion to the frequency of the audio signal.
Open complete paper
6
2016 · Physics · Modern Physics · Communication Systems
JEE MAIN 2016 ONLINE 10TH APRIL MORNING SLOT
A modulated signal Cm(t) has the form Cm(t) = 30 sin 300 \(\pi\)t + 10 (cos 200 \(\pi\)t −cos 400 \(\pi\)t). The carrier frequency c, the modulating frequency (message frequency) f\(\omega\), and the modulation index \(\mu\) are respectively given by :
A
fc = 200 Hz; f\(\omega\) = 50 Hz; \(\mu\) = \({1 \over 2}\)
B
fc = 150 Hz; f\(\omega\) = 50 Hz; \(\mu\) = \({2 \over 3}\)
C
fc = 150 Hz; f\(\omega\) = 30 Hz; \(\mu\) = \({1 \over 3}\)
D
fc = 200 Hz; f\(\omega\) = 30 Hz; \(\mu\) = \({1 \over 2}\)
Open complete paper
7
2016 · Physics · Modern Physics · Communication Systems
JEE MAIN 2016 ONLINE 9TH APRIL MORNING SLOT
An audio signal consists of two distinct sounds : one a human speech signal in the frequency band of 200 Hz to 2700 Hz, while the other is a high frequency music signal in the frequency band of 10200 Hz to 15200 Hz. The ratio of the AM signal bandwidth required to send both the signals together to the AM signal bandwidth required to send just the human speech is :
A
3
B
5
C
6
D
2
Open complete paper
8
2017 · Physics · Modern Physics · Communication Systems
JEE MAIN 2017 OFFLINE
In amplitude modulation, sinusoidal carrier frequency used is denoted by \({\omega _c}\) and the signal frequency is denoted by \({\omega _m}\). The bandwidth (\(\Delta {\omega _m}\)) of the signal is such that \(\Delta {\omega _m}\) < < \(\omega _c\). Which of the following frequencies is not contained in the modulated wave?
A
\({\omega _m}\)
B
\({\omega _c}\)
C
\({\omega _m}\) + \({\omega _c}\)
D
\({\omega _c}\) - \({\omega _m}\)
Open complete paper
9
2017 · Physics · Modern Physics · Communication Systems
JEE MAIN 2017 ONLINE 8TH APRIL MORNING SLOT
A signal of frequency 20 kHz and peak voltage of 5 Volt is used to modulate a carrier wave of frequency 1.2 MHz and peak voltage 25 Volts. Choose the correct statement.
A
Modulation index = 5, side frequency bands are at 1400 kHz and 1000 kHz
B
Modulation index = 5, side frequency bands are at 21.2 kHz and 18.8 kHz
C
Modulation index = 0.8, side frequency bands are at 1180 kHz and 1220 kHz
D
Modulation index = 0.2, side frequency bands are at 1220 kHz and 1180 kHz
Open complete paper
10
2017 · Physics · Modern Physics · Communication Systems
JEE MAIN 2017 ONLINE 9TH APRIL MORNING SLOT
A signal is to be transmitted through a wave of wavelength \(\lambda\), using a linear antenna. The length l of the antenna and effective power radiated Peff will be given respectively as :

(K is a constant of proportionality)
A
\(\lambda\), Peff = K \(\left( {{1 \over \lambda }} \right)\)2
B
\({{\lambda \over 8}}\), Peff = K \(\left( {{1 \over \lambda }} \right)\)
C
\({{\lambda \over 16}}\), Peff = K \(\left( {{1 \over \lambda }} \right)\)3
D
\({{\lambda \over 5}}\), Peff = K \(\left( {{1 \over \lambda }} \right)\)\({\left( {{1 \over \lambda }} \right)^{{1 \over 2}}}\)
Open complete paper
11
2018 · Physics · Modern Physics · Communication Systems
JEE MAIN 2018 OFFLINE
A telephonic communication service is working at carrier frequency of 10 GHz. Only 10% of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of 5 kHz ?
A
2 \(\times\) 106
B
2 \(\times\) 103
C
2 \(\times\) 105
D
2 \(\times\) 104
Open complete paper
12
2018 · Physics · Modern Physics · Communication Systems
JEE MAIN 2018 ONLINE 15TH APRIL EVENING SLOT
The carrier frequency of a transmitter is provided by a tank circuit of a coil of inductance 49 \(\mu\)H and a capacitance of 2.5 nF. It is modulated by an audio signal of \(12\) \(kHz.\) The frequency range occupied by the side bands is :
A
13482 kHz \(-\) 13494 kHz
B
442 kHz \(-\) 466 kHz
C
63 kHz \(-\) 75 kHz
D
18 kHz \(-\) 30 kHz
Open complete paper
13
2018 · Physics · Modern Physics · Communication Systems
JEE MAIN 2018 ONLINE 15TH APRIL MORNING SLOT
The number of amplitude modulted broadcast stations that can be accomodated in a \(300\) \(kHz\) band width for the highest modulating frequency \(15\) \(kHz\) will be :
A
\(20\)
B
\(15\)
C
\(10\)
D
\(8\)
Open complete paper
14
2018 · Physics · Modern Physics · Communication Systems
JEE MAIN 2018 ONLINE 16TH APRIL MORNING SLOT
A carrier wave of peak voltage 14 V is used for transmitting a message signal. The peak voltage of modulating signal given to achieve a modulation index of 80% will be :
A
7 V
B
28 V
C
11.2 V
D
22.4 V
Open complete paper
15
2019 · Physics · Modern Physics · Communication Systems
JEE MAIN 2019 ONLINE 10TH APRIL MORNING SLOT
Given below in the the left column are different modes of communication using the kinds of waves given the right column.
A Optical Fibre
communication		 P Ultrasound
B Radar Q Infrared Light
C Sonar R Microwaves
D Mobile Phones S Radio Waves
A
A-Q, B-S, C-R, D-P
B
A-Q, B-S, C-P, D-R
C
A-S, B-Q, C-R, D-P
D
A-R, B-P, C-S, D-Q
Open complete paper
16
2019 · Physics · Modern Physics · Communication Systems
JEE MAIN 2019 ONLINE 10TH APRIL MORNING SLOT
A message signal of frequency 100 MHz and peak voltage 100 V is used to execute amplitude modulation on a carrier wave of frequency 300 GHz and peak voltage 400 V. The modulation index and difference between the two side band frequencies are :
A
0.25; 1 × 108 Hz
B
4; 2 × 108 Hz
C
4; 1 × 108 Hz
D
0.25; 2 × 108 Hz
Open complete paper
17
2019 · Physics · Modern Physics · Communication Systems
JEE MAIN 2019 ONLINE 10TH JANUARY EVENING SLOT
The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license what broadcast frequency will you allot ?
A
2900 kHz
B
2750 kHz
C
2250 kHz
D
2000 kz
Open complete paper
18
2019 · Physics · Modern Physics · Communication Systems
JEE MAIN 2019 ONLINE 10TH JANUARY MORNING SLOT
A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m. What is the maximum distance upto which signals can be broadcasted from this tower is LOS (Line of Sight) mode ? (Given : radius of earth = 6.4 × 106 m).
A
40 km
B
65 km
C
48 km
D
80 km
Open complete paper
19
2019 · Physics · Modern Physics · Communication Systems
JEE MAIN 2019 ONLINE 11TH JANUARY EVENING SLOT
An amplitude modulated signal is plotted below :

JEE Main 2019 (Online) 11th January Evening Slot Physics - Communication Systems Question 83 English

Which one of the following best describes the above signal ?
A
(1 + 9sin (2\(\pi\) \(\times\) 104 t)) sin(2.5\(\pi\) \(\times\) 105t) V
B
(9 + sin (4\(\pi\) \(\times\) 104 t)) sin(5\(\pi\) \(\times\) 105t) V
C
(9 + sin (2\(\pi\) \(\times\) 104 t)) sin(2.5\(\pi\) \(\times\) 105t) V
D
(9 + sin (2.5\(\pi\) \(\times\) 104 t)) sin(2\(\pi\) \(\times\) 104t) V
Open complete paper
20
2019 · Physics · Modern Physics · Communication Systems
JEE MAIN 2019 ONLINE 11TH JANUARY MORNING SLOT
An amplitude modulated signal is given by V(t) = 10[1 + 0.3cos(2.2 \(\times\) 104 t)] sin(5.5 \(\times\) 105 t). Here t is in seconds. The sideband frequencies (in kHz) are, [Given \(\pi\) = 22/7]
A
892.5 and 857.5
B
89.25 and 85.75
C
1785 and 1715
D
178.5 and 171.5
Open complete paper

Showing 20 of 101 questions