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CBSE Notes 2011-2012 » XII-Physics

Communication Systems

Name the device which can represent digital data by analog signals and vice-versa. [Delhi 2005C]

Short answer question

Name the device which can represent digital
data by analog signals and vice-versa.
[Delhi 2005C]

What is a transponder ? [Delhi 2005C]

Short answer question

What is a transponder ? [Delhi 2005C]

The transmission of signals using ground waves are restricted upto a frequency of about 1500 kHz. Wh...

Short answer question

The transmission of signals using ground
waves are restricted upto a frequency of about
1500 kHz. Why ? [Delhi 2005C]

How does the effective power radiated by an antenna vary with wavelength ? [AI 2005]

Short answer question

How does the effective power radiated by an
antenna vary with wavelength ? [AI 2005]

Name the process by which exact reproduction of a document at a distant place can be received.

Short answer question

Name the process by which exact reproduction
of a document at a distant place can be
received.

Give any one difference between FAX and e-mail systems of communication. [AI 2006

Short answer question

Give any one difference between FAX and
e-mail systems of communication. [AI 2006

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