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Write three important factors which justify the need of modulating a message signal. Show diagrammatically how an amplitude modulated wave is obtained when a modulating signal is superimposed on a carrier wave.
Concept: Amplitude Modulation (AM)
In the given block diagram of a receiver, identify the boxes labeled as X and Y and write their functions.
Concept: Modulation and Its Necessity
Given modulation index physical significance .For an amplitude modulated wave, the maximum amplitude is found to be 10 V while the minimum amplitude is 2 V. Determine the modulation index μ ?
Concept: Modulation and Its Necessity
What do you mean by bandwidth of a signal? Give its importance.
Concept: Bandwidth of Signals
Differentiate between Analog and Digital communication.
Concept: Bandwidth of Signals
Answer the following question.
Why a signal transmitted from a TV tower cannot be received beyond a certain distance? Write the expression for the optimum separation between the receiving and the transmitting antenna.
Concept: Modulation and Its Necessity
Answer the following question.
If A and B represent the maximum and minimum amplitudes of an amplitude-modulated wave, write the expression for the modulation index in terms of A and B.
Concept: Amplitude Modulation (AM)
Solve the following question.
A message signal of frequency 20 kHz and peak voltage 10 V is used to modulate a carrier of frequency 2 MHz and peak voltage of 15 V. Calculate the modulation index. Why the modulation index is generally kept less than one?
Concept: Amplitude Modulation (AM)
Describe any four consequences of the disintegration of Soviet Union
Concept: Disintegration of the Soviet Union and Its Impact Or Consequences on the World Order
American involvement in South Asia has rapidly increased after the Cold War. Give two examples to illustrate.
Concept: India and the Cold War
Identify the group of countries that had been part of the Soviet Union before its disintegration.
Concept: Disintegration of the Soviet Union and Its Impact Or Consequences on the World Order
What is the full form of “SAARC”?
Concept: What Was the Soviet System?
Why did the superpowers need smaller states as their allies? Explain any four reasons.
Concept: Introduction of Democratic Politics and Capitalism in Post-communist Regimes
Analyse India’s changing relationship with post-Communist Russia.
Concept: India and Post-communist Countries
Analyse any three happenings during Gorbachev's period that led to the disintegration of the Soviet Union.
Concept: Gorbachev and Disintegration
Study the cartoon given below carefully and answer the following questions:
i. The given cartoon is related to which country?
ii. Which two symbols in this cartoon helped in identifying the country?
iii. What message does this cartoon convey to the world?
Concept: The Rise of the Chinese Economy
Assess the role of ASEAN as an economic association.
Concept: The Rise of the Chinese Economy
What makes the European Union a highly influential regional organisation?
Concept: European Union
Explain the term 'ASEAN WAY'.
Concept: Association of South East Asian Nations (ASEAN)
Explain any two major policy decisions made by the Chinese government to open and develop its economy.
Concept: The Rise of the Chinese Economy
