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# Class XII Physics Communication System Quiz 2

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Question 1

In amplitude modulation, sinusoidal carrier frequency used is denoted by and the signal frequency is denoted by . The bandwidth of the signal is such that . Which of the following frequencies is not contained in the modulated wave?

Question 2

The modulation index of an FM is 0.35. If modulating frequency is 5 kHz, the maximum deviation of frequency would be

Question 3

A plane electromagnetic wave of wavelength λ has an intensity I. It is propagating along the positive Y-direction. The allowed expressions for the electric and magnetic fields are given by :

Question 4

A monochromatic beam of light has a frequency and is propagating along the direction It is polarized along the direction. The acceptable form for the magnetic field is :

Question 5

Long range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen the frequency of the radio waves must be in the range:

Question 6

An electromagnetic wave of frequency hertz is propagating along z-axis. The amplitude of electric field is 4 V/m. If then average energy density of electric field will be :

Question 7

An EM wave from air enters a medium. The electric fields are in air and in medium, where the wave number k and frequency refer to their values in air. The medium is non-magnetic. If and refer to relative permittivities of air and medium respectively, which of the following options is correct?

Question 8

For plane electromagnetic waves propagating in the z direction, which one of the following combination gives the correct possible direction for and field respectively?
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