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what is modulation? what is its need.

(1) (2, 1)

(2) (2, 2)

(3) (1, 0)

(4) (0, 1)

What is meant by grating element?

Solve this:Two identical bodies are made of a material for which the heat capacity increase with temperature. One of these is at 100

^{o}C, while the other one is 0^{o}C. If the two bodies are b ought into contact then, assuming no heat loss, the final common temperature is :(1) less than 50

^{o}C but greater than 0^{o}C (2) 0^{o}C(3) 50

^{o}C (4) more than 50^{o}Cwhy skywave not used in the transmission of tv signals?

(1) $\frac{F}{2}$ towards right

(2) $\frac{F}{3}$ towards left

(3) $\frac{2F}{3}$ towards right

(4) Zero

What is the difference between point to point and broadcast communication modes. Give one example

(1) 10 kg-${m}^{2}$

(2) 30 kg-${m}^{2}$

(3) 40 kg-${m}^{2}$

(4) 25 kg-${m}^{2}$

define sky wave propogationQ). A sphere of radius 25 cm and mass 1 kg is hung by a string of negligible mass and length 40 cm, then tension in the string is :

(1) 10.81 N

(2) 18.4 N

(3) 10 N

(4) 8 N

why ar microwaves used in RADAR?

29.A ring takes time t_{1}and t_{2}for sliding down and rolling down an inclined plane of length L respectively for reaching the bottom. The ratio of t_{1}and t_{2}is :-$\left(1\right)\sqrt{2}:1\left(2\right)1:\sqrt{2}\left(3\right)1:2\left(4\right)2:1$

(1) 28 %

(2) 72 %

(3) 100 %

(4) none of these

when modulation index is kept less than 1 distortion dosent occur.......how and why???? plxzzzzzzz reply briefly........nd fastly.......

Q.32. If a carved black utensil is heated to high temperature and then brought in dark then :

(1) Both utensil and its carving will shine

(2) Only carving will shine

(3) Only utensil will shine

(4) None of the utensil and carving will shine

draw a block diagram of a simple amplitude modulation.explain briefly,how amplitude modulationis achieved.

Explain why high frequency carrier waves are needed for effective transmission of signals?

what is square law device? what is the function of this?Please suggest me any me hurry up!

i am wating your reply?

1) 4 J

2)8 J

3)12 J

4)16 J

State two factors by which the range of TV signal can be increased??

radius 3 R from O in which a hole of radius R is cut whose centre is at 2R distance from centre of large circular plate.

(1) R/4

(2) R/5

(3) R/2

(4) none of these

why do we need to modulate the frequency?

what are the limitations of amplitude modulation?

explain detection of amplitude modulated wave

What is meant by detection of modulated carrier wave? Explain briefly steps for detection?

what is ground wave propagation

Which mode of propagation is used by short wave broadcast services having frequency range from a few MHz upto 30MHz? Expain diagrammatically how long distance communication can be achieved by this mode.Why is there an upper limit to frequency of waves used in this mode?

Sir plz..give the answer fast!!!!

write two factors justifying the need of modulating a signal.

(A)-3. (B)-5. (C)-7. (D)-10.

Why do we use manganine wire in potentiometer?Q. Two spheres of radii in the ratio 1 : 2 and densities in the ratio 2: 1 and of same specific heat, are heated to same temperature and left in the same surrounding. Their rate of falling temperature will be in the ratio:

(1) 2 : 1 (2) 1 : 1 (3) 1 : 2 (4) 1 : 4

what is square law device?

â€‹Q13. A solid sphere of mass m and radius R is rolling without slipping on a rough horizontal surface with angular acceleration $\alpha $. Centre of mass of sphere lies at a distance $\frac{\mathrm{R}}{\sqrt{2}}$ from the centre of sphere. Find the normal force applied by sphere on the surface at an instant when line joining centre of mass of sphere and centre of sphere makes an angle 45° with vertical and angular velocity of sphere at this instant is $\mathrm{\omega}$.

$\left(\mathrm{A}\right)\mathrm{mg}+\frac{\mathrm{mR}}{2}\left(\mathrm{\alpha}\u2013{\mathrm{\omega}}^{2}\right)\left(\mathrm{B}\right)\mathrm{mg}-\frac{{\displaystyle \mathrm{mR}}}{{\displaystyle 2}}\left(\mathrm{\alpha}+{\mathrm{\omega}}^{2}\right)\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{C}\right)\mathrm{mg}+\frac{{\displaystyle \mathrm{mR}}}{{\displaystyle 2}}\left(\mathrm{\alpha}\u2013{\mathrm{\omega}}^{2}\right)\left(\mathrm{D}\right)\mathrm{mg}+\frac{{\displaystyle \mathrm{mR}}}{{\displaystyle 2}}\left(\mathrm{\alpha}+{\mathrm{\omega}}^{2}\right)$

Sir, Why moon cannot be used as a communication satellite?

I need to prepare project on Communication System ...can someone help me on it

It is based on the CBSE....and i need it for submission for the partial fullfilment for the requirement for studies in Physics 10+2.

please help me select toic or to prepare.

your help is heartly welcome at: thomasofjnv@gmail.com

before 06 november, 2012.

(1) $0,\frac{\mathrm{g}}{2}$ (2) $0,\frac{2\mathrm{g}}{3}$ (3) $\frac{3\mathrm{g}}{5},\frac{\mathrm{g}}{5}$ (4) $\frac{2\mathrm{g}}{5},\frac{\mathrm{g}}{5}$

What is space wave propagation?

explain about downlink and uplink????

The block diagram of AM transmitter and AM receiver

what is the necessity of modulation?

examples of sky wave propagation,ground wave rpopagation

why is an FM signal less susceptible to noise than AM signal ?

A TV tower has a height of 100m. How much population is covered by the TV broadcast if the average population density around the tower is 1000 persons per sq km?

What is amplitude modulation?

Q.7. In optical communication system operating at 1200 nm, only 2 % of the source frequency is available for TV transmission having a bandwidth of 5 MHz. The number of TV channels that can transmitted is

(a) 2 million

(b) 10 million

(c) 0.1 million

(d) 1 million

an audio signal is not transmitted directly by converting it into an electromagnetic wave of same frequency.give 2 reasons.

Q.21. A loaded 20,000 kg coal wagon is moving on a linear track with a 8 m/s. Suddenly 8000 kg of coal is dropped out of wagon. The final speed of the wagon is

(1) 6 m${s}^{-1}$

(2) 8 m${s}^{-1}$

(3) $\frac{40}{3}$ m/s

(4) $\frac{20}{3}$ m/s

KINDLY PROVIDE THE SOLUTION OF PHYSICS CLASS 12 SET 55/3 OF BOARD 2013 SOON?

in an amplitude modulated wave for audio frequency of 500 cycles/second, the appropriate carrier frequency will be

pls explain modulation and demodulation???/

draw a plot of variation of ' amplitude ' versus 'w ' for an amplitude modulated wave. hence explain the need for keeping the broadcast frequencies sufficiently spaced out ?

Q.11. What percentage of power of AM wave is carried by the side bands for modulation index m = 1 ?

what is html?explain in detail?

define frequency modulation ? write the advantages of frequency modulation over amplitude modulation ?what does line of sight communication means???

Why do long distance radio broadcasts use shortwave bands?

(1) $\frac{1}{3}\mathrm{tan}\theta $

(2) $\frac{1}{3}\mathrm{sin}\theta $

(3) $\frac{2}{3}\mathrm{tan}\theta $

(4) $\frac{2}{3}\mathrm{sin}\theta $

What is sky wave propagation ?

A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pico farad in parallel with a load resistance 100 kilo ohm. Find the maximum modulated frequency which could be detected by it

A message signal of frequency 10kHz and peak voltage 10 V is used to modulate a carrier of frequency 1 MHz and peak voltage of 20V.Determine

a) Modulation Index

b) the side bands produced

Difference between transducer and transmitter?

(1) $\frac{1}{2}$

(2) $\frac{3}{7}$

(3) $\frac{2}{7}$

(4) $\frac{2}{10}$

what is the bandwidth of

speech

tv

and digital data???

what are logic gates??

explain the function of modem in data communication