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JEE Mains Previous Years Questions with Solutions

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1

AIEEE 2011

MCQ (Single Correct Answer)
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.

Explanation

For long distance communication, sky wave signals are used.

Also, the state of ionosphere varies every time. So, both statements are correct.
2

AIEEE 2003

MCQ (Single Correct Answer)
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.

Explanation

Optical fibres form a dielectric wave guide and are free from electromagnetic interference or radio frequency interference.

Questions Asked from Communication Systems

On those following papers in MCQ (Single Correct Answer)
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JEE Main 2018 (Offline) (1)
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