Tag: understanding communication and impact of mass media

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Questions Related to understanding communication and impact of mass media

Multiple choice evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

Match List-1 with List-2. 

List-1 List-2
a. Point to point communication e. RADAR
b. broadcast communication f. AM radio
c. Line of sight g. FM radio communication
d. Satellite communication h. Traditional telephony
i. Mobile telephony
j. TV

  1. a-h; b-f,g,j; c-e; d-i,j

  2. a-e; b-i,j; c-h; d-g,f

  3. a-f ; b-h,i,j; c-g; d-e

  4. a-g; b-f,g,j; c-e; d-i,j
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
(a-h): A point-to-point connection refers to a communications connection between two nodes or endpoints.
(b-f, g ,j): Reaches a wider range at faster speed.
(c-e) Line of sight is a type of propagation that can transmit and receive data only where transmit and receive stations are in view of each other without any sort of an obstacle between them.
(d-i, j) Signal transferring between the sender and receiver is done with the help of satellite.
Multiple choice evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

The frequency of transmission of a ratio station is $30\, MHz$. The wavelength of the waves transmitted by the centre will be- 

  1. $5$ meter

  2. $10$ meter

  3. $15$ meter

  4. $20$ meter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The wavelength lambda is calculated using the formula lambda = c / f, where c is the speed of light (3 * 10^8 m/s) and f is the frequency (30 MHz = 30 * 10^6 Hz). Thus, lambda = (3 * 10^8) / (3 * 10^7) = 10 meters.

Multiple choice evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

Long range transmission of TV-signal is done by

  1. space wave

  2. sky wave

  3. ground wave

  4. artificial satellite
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

TV-signal ( $30: MHz$ - $300:MHz$) are not reflected by ionosphere. Therefore, sky-wave propagation is not possible and similarly ground and space wave is also not feasible. Hence, they are transmitted to artificial satellite from where they are transmitted back to the Earth.

Multiple choice evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

What fraction of the surface area of earth can be covered to establish communication by one geostationary satellite?

  1. $\displaystyle\frac{1}{2}$

  2. $\displaystyle\frac{1}{3}$

  3. $\displaystyle\frac{1}{4}$

  4. $\displaystyle\frac{1}{8}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We uses three geostationary satellites placed at the vertices of an equilateral triangle, then the entire earth can be covered by the communication network, each satellite covers $1/3$ of the globe.

Multiple choice evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

A ground receiver station is receiving a signal at (a) 5 MHz and (b) 100MHz, transmitted from a ground transmitter at a height of 400m located at a distance of 125km. Identify whether it is coming via space wave or sky wave propagation or satellite transponder. Radius of earth = $6.4\times { 10 }^{ 6 }m$; maximum number density of electrons in ionosphere = ${ 10 }^{ 12 }{ m }^{ -3 }$ 


  1. $9MHz$

  2. $5MHz$

  3. $4MHz$

  4. All of these.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Height of the ground transmitter $=30\ cm$
Range of transmission $=100\ km$
maximum distance covered by space wave propagation is
$d=\sqrt{2\ Rh}$
$=\sqrt{2\times 64\times 10^{6}\times 300}$
$=62\ km$
critical frequency for ionospheric propagation is, 
$F _{C}=9(N _{max})^{112}$
$=9(10^{12})^{112}$
$=9\times 10^{6}=9\ MHZ$
Multiple choice physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

For satellite communication which wave is used?

  1. Space wave

  2. Sky wave

  3. Ground wave

  4. Microwave
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A space wave travels in a straight line from transmitting antenna to the receiving antenna. Space waves are used for line of sight communication as well as satellite communication.

Multiple choice physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

State whether the given statement is True or False :

Remote sensing is a technique of collection of information about an object, without a physical contact.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object and thus it is in contrast to on site observation. In modern usage, the term generally refers to the use of aerial sensor technologies to detect and classify objects on Earth.
Hence, the statement is true.

Multiple choice physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

As the height of a satellite orbit gets lower, the speed of the satellite _________.

  1. decreases

  2. increases

  3. remains the same

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$V=\sqrt { \cfrac { GMe }{ r }  } \ \therefore V\propto \cfrac { 1 }{ \sqrt { r }  } $

With decrease in $'r'$, velocity of satellite $increases$.

Multiple choice physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

Let $R _s$ and $R _m$ be the distance of the geostationary satellite and moon from the center of earth. Then $\dfrac{R _m}{R _s}$ is

  1. $(29)^{1/2}$

  2. $(29)^{2/3}$

  3. $29$

  4. $(29)^{3/2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using Kepler's Third Law, T^2 is proportional to R^3. For a geostationary satellite, T is 1 day. For the moon, T is approximately 29 days. Thus, (Rm/Rs)^3 = (Tm/Ts)^2 = (29/1)^2, which means Rm/Rs = (29^2)^(1/3) = 29^(2/3).

Multiple choice physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

If the satellite is stopped sudden;y in its orbit which is at a distance radius of earth from earth's surface and allowed to fall freely into the earth. the speed with which it hits the surface of earth will be:

  1. <span>$38,525 km/s$</span>

  2. <span>$1,525 km/s$</span>

  3. <span>$18,525 km/s$</span>

  4. $28,525 km/s$
Reveal answer Fill a bubble to check yourself
D Correct answer