Communication Systems, Popular Questions: Karnataka Class 12-science PHYSICS, Physics Puc Ii (part 2)

abhinuj28... asked a question

Subject: Physics, asked on on 11/1/11

what is modulation? what is its need.

Akash Sharma asked a question

Subject: Physics, asked on on 10/9/17

Q. 4 A block of mass 15 kg is resting on a rough inclined plane as shown in figure. The block is tied up by a horizontal string having a tension of 50 N. Calculate the coefficient of friction between the block and the inclined plane.

Anandita asked a question

Subject: Physics, asked on on 22/2/11

What is meant by grating element?

Krishna Vamsi asked a question

Subject: Physics, asked on on 27/10/17

Block A of mass m rests on the plank B of mass 3 m which is free to slide on a frictionless horizontal surface. The coefficient of friction between the block and plank is 0.2. If a horizontal force of magnitude 2 mg is applied to the plank B, the acceleration of A relative to the plank and relative to the ground respectively are:

(1)

0, \frac{g}{2}

(2)

0, \frac{2 g}{3}

(3)

\frac{3 g}{5}, \frac{g}{5}

(4)

\frac{2 g}{5}, \frac{g}{5}

Abhiram Sasidhar asked a question

Subject: Physics, asked on on 21/2/13

why skywave not used in the transmission of tv signals?

Navya asked a question

Subject: Physics, asked on on 5/6/18

The vector sum of two vectors of magnitudes 10 units and 15 units can never be

Karan asked a question

Subject: Physics, asked on on 4/3/14

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

Akash Sharma asked a question

Subject: Physics, asked on on 5/10/17

Q 29

29. A ring takes time t₁ and t₂ for sliding down and rolling down an inclined plane of length L respectively for reaching the bottom. The ratio of t₁ and t₂ is :-

(1) \sqrt{2} : 1 (2) 1 : \sqrt{2} (3) 1 : 2 (4) 2 : 1

Alka Vijay asked a question

Subject: Physics, asked on on 24/2/11

define sky wave propogation

Supratick Ghosh asked a question

Subject: Physics, asked on on 16/8/18

A rocket is launched upward from the earth surface whose velocity time graph shown in the figure.Then maximum height attained by rocket

Mirza Khalit Afzal Beg asked a question

Subject: Physics, asked on on 24/6/12

why ar microwaves used in RADAR?

Akash Sharma asked a question

Subject: Physics, asked on on 18/9/17

Q The only force F acting on a 2 kg body moves along x-axis varies as shown in the figure. The velocity of the body along positive x-axis at x=0 is 4m/s. The kinetic energy of the body at x=3 m is:-
1) 4 J
2)8 J

3)12 J
4)16 J

Amrutha asked a question

Subject: Physics, asked on on 12/11/12

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

Hardee Shah asked a question

Subject: Physics, asked on on 7/2/17

A particle moves with a constant speed v along a circular path of radius r and completes the circle in time T. What is the acceleration of the particle?

Armin Kalita asked a question

Subject: Physics, asked on on 1/3/12

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

Aditi asked a question

Subject: Physics, asked on on 11/4/18

Q. In the figure shown, friction force between the bead and the light string is mg/4. Find the time in which the bead losses contact with string after the system is released from rest.

Aditi Singh asked a question

Subject: Physics, asked on on 22/11/14

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

Akash Sharma asked a question

Subject: Physics, asked on on 26/2/18

Solve this:
Q). 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

anupgoyaledurtc... asked a question

Subject: Physics, asked on on 6/12/10

what is square law device? what is the function of this?

Please suggest me any me hurry up!

i am wating your reply?

Shruti Basu asked a question

Subject: Physics, asked on on 1/3/16

if the whole earth is to be connected by LOS communication using space waves what is the minimum number of antennas required calculate the tower height of these antennas in terms of earths radius.

Jayshree asked a question

Subject: Physics, asked on on 13/1/13

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

Tanmaiyee Reddy asked a question

Subject: Physics, asked on on 8/9/17

ans d
13. A body has maximum range R₁when projected up the inclined plane. The same body when projected down the inclined plane, it has maximum range R₂. Assuming equal speed of projection in each case and the body is projected on the inclined plane in the line of the greatest slope the maximum range R on horizontal ground (same speed of projection) can be

A) R = R₁R₂B) R = R₁ + R₂ C) R =

\frac{R_{1} R_{2}}{R_{1} + R_{2}}

D) R =

\frac{2 R_{1} R_{2}}{R_{1} + R_{2}}

Ria Sarkar asked a question

Subject: Physics, asked on on 20/1/13

why do we need to modulate the frequency?

Shaik Saaduddin asked a question

Subject: Physics, asked on on 24/6/17

The moment of inertia of a body rotating about a given axis is 12.0 kgm² in the SI system. what is the value of the moment of inertia in a system of units in which the unit of length is 5 cm and the unit of mass is 10 g?

sumitkanwar148... asked a question

Subject: Physics, asked on on 23/12/11

what are the limitations of amplitude modulation?

Akash Sharma asked a question

Subject: Physics, asked on on 6/10/17

Q.3. The moment of inertia of a square lamina about the perpendicular axis through its centre of mass is 20 kg-

m^{2}

. Then, its moment of inertia about an axis touching its side and in the plane of the lamina will be :
(1) 10 kg-

m^{2}

(2) 30 kg-

m^{2}

(3) 40 kg-

m^{2}

(4) 25 kg-

m^{2}

Renju & 1 other asked a question

Subject: Physics, asked on on 11/11/12

explain detection of amplitude modulated wave

Rahul Meena asked a question

Subject: Physics, asked on on 15/6/17

Find minimum value of the angle θ so that block of mass m does not move on rough surface. The coefficient of static friction between the block and surface whatever may be the value of applied force F.

Nikhil Chaudhari asked a question

Subject: Physics, asked on on 3/3/13

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

Akash Sharma asked a question

Subject: Physics, asked on on 6/10/17

Q.1. The linear and angular acceleration of a particle are 10 m/

s e c^{2}

and 5 rad/

s e c^{2}

respectively. It will be at a distance from the axis of rotation.
(1) 50 m
(2)

\frac{1}{2}

m
(3) 1 m
(4) 2 m

Anand Verma asked a question

Subject: Physics, asked on on 26/10/13

what is ground wave propagation

Sky asked a question

Subject: Physics, asked on on 18/1/18

Solve this:
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

Jignesh Agarkar asked a question

Subject: Physics, asked on on 2/3/13

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!!!!

Aditya Jayaprakash asked a question

Subject: Physics, asked on on 8/1/18

Q. A galvanometer gives full scale deflection with 6mA current. By connecting it to a 4990

Ω

resistance, it can be converted into a voltmeter of range 0 -30 V. Explain how you convert the same galvanometer to an ammeter of range 0- 1.5 A.

Q. A TV tower of height of 75m is situated on the top of a hill. If the average population density around the tower is 1000/km2, calculate the population covered by the TV broadcast. Height of the hill from the ground level is 25m.

Abhee & 1 other asked a question

Subject: Physics, asked on on 4/3/16

write two factors justifying the need of modulating a signal.

Mathai Kocuplamveedu asked a question

Subject: Physics, asked on on 25/2/15

A TV transmitting antenna is 125 m tall. How much service area can this transmitting antenna cover, if the receiving antenna is at the ground level? (radius of earth 6400 KM)

asonianj2011... asked a question

Subject: Physics, asked on on 20/1/12

Why do we use manganine wire in potentiometer?

Jiyarul Haque asked a question

Subject: Physics, asked on on 25/12/17

What should be the height of a transmitting antenna for a TV telecast to cover a radius of 128 km?

Ck asked a question

Subject: Physics, asked on on 25/10/12

what is square law device?

Ashish Chandel asked a question

Subject: Physics, asked on on 14/1/17

what is the function of a band pass filter used in a modulator for obtaining AM signal

V S Jey Govind asked a question

Subject: Physics, asked on on 14/2/12

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

Shivangi Dubey asked a question

Subject: Physics, asked on on 26/6/13

Which part of electromagnetic spectrum is used in satellite communication ?

Jaikhlang Brahma asked a question

Subject: Physics, asked on on 30/10/12

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.

Tanima asked a question

Subject: Physics, asked on on 9/7/18

A trolley is falling freely on inclined plane as shown .The angle of string of pendulum with the ceiling of trolley (alhpa) is ?

Anand Verma asked a question

Subject: Physics, asked on on 26/10/13

What is space wave propagation?

Nikita D asked a question

Subject: Physics, asked on on 22/6/14

The block diagram of AM transmitter and AM receiver

Liya Sara Joy asked a question

Subject: Physics, asked on on 16/1/12

explain about downlink and uplink????

Akash Sharma asked a question

Subject: Physics, asked on on 6/10/17

Q.30. Mass is distributed uniformly over a thin square plate. If two end point of a diagonal are (- 2, 0) and (2, 2), what are the coordinates of centre of mass of plate?
(1) (2, 1)
(2) (2, 2)
(3) (1, 0)
(4) (0, 1)

Akshay asked a question

Subject: Physics, asked on on 21/3/12

what is the necessity of modulation?

tonyneeranakunnel... asked a question

Subject: Physics, asked on on 19/1/11

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

Shreya Bajpai asked a question

Subject: Physics, asked on on 24/12/16

Block diagram of modulation and demodulation

Meer Abdus Samad asked a question

Subject: Physics, asked on on 4/3/16

how are sidebands produced ?

Ashwani Singh asked a question

Subject: Physics, asked on on 11/4/19

(B) (D) 23. In the diagram shown in figure (&-10m/s) tim 30? aby tw Column II Column I (P) 8 (Q) 25 (R) 2 (S) 45 (n None (A) Acceleration of2 kg block in m/s' (B) Net force on 3kg block in newton ion between 2 kg and I kginn newton Nommal reaction between3 kg and 2 kg in new (D) A block A of mass m is placed over a plank Bof mass 2 m. Plank B is placed over a smooth horizontal 24, fae The coefficient of trietion betweenA and Bis0.s Block A is given a velocity w towands right.

Hasna .p asked a question

Subject: Physics, asked on on 18/3/11

1) What is 'square law device'?What is it's use?
2)What is 'bandpass filter centred'?
3)What is the purpose of 'IF stage'?

Arshan Ahmad asked a question

Subject: Physics, asked on on 26/4/18

The height above the ground of a child on a swing varies from 1 meter at lowest point. The maximum speed (in m/s ) of the child is approximately?
(A)-3. (B)-5. (C)-7. (D)-10.

Arun Mohan A M & 3 others asked a question

Subject: Physics, asked on on 31/10/14

What is amplitude modulation?

vusha73 asked a question

Subject: Physics, asked on on 11/12/11

is it necessary for a transmitting antenna to be at the same height as that of a the receiving antennae for line of sight communication?a tv transmitting antenna is 81 m tall.how much service area can it cover if the receiving antenna is at the ground level?

Supriya Anand asked a question

Subject: Physics, asked on on 2/3/14

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?

Akash Sharma asked a question

Subject: Physics, asked on on 25/10/17

Q.29. A force F is applied at the top of a ring of mass M and radius R placed on a rough horizontal surface as shown in figure. Friction is sufficient to prevent slipping. The friction force acting on the ring is -

(1)

\frac{F}{2}

towards right
(2)

\frac{F}{3}

towards left
(3)

\frac{2 F}{3}

towards right
(4) Zero

Shiva Pillai asked a question

Subject: Physics, asked on on 2/3/16

Derive an expression for covering range of TV transmission tower

anjalip19... asked a question

Subject: Physics, asked on on 18/1/13

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

Tanima asked a question

Subject: Physics, asked on on 9/7/18

In the following figure ,if tension in the string AB is 51N ,then tension in the string BC will be?

Dadhichi asked a question

Subject: Physics, asked on on 5/3/13

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

Tuhinaa Nanda asked a question

Subject: Physics, asked on on 14/11/12

pls explain modulation and demodulation???/

Anannya Priyadarshini asked a question

Subject: Physics, asked on on 15/2/17

a tv tower has a height h. derive an expression for maximum distance up to which the signal can be received from the Earth

Shivani Sharma asked a question

Subject: Physics, asked on on 24/2/12

X and Y are two parallel plate capacitor having same area of plate and same separation b/w the plates X has air b/w the plates andY has dielectric of dielectric constant k=4

Sky asked a question

Subject: Physics, asked on on 18/1/18

Solve this:
A black body emits radiations of maximum intensity at 5000 A^o when its temperature is 1227^oC. If its temperature is increased by 1000^o C then the maximum intensity of emitted radiation will be at :
(1) 2754.8 A^o (2) 3000 A^o (3) 3500 A^o (4) 4000 A^o

Sneha Pai asked a question

Subject: Physics, asked on on 9/12/13

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 ?

Charanjeet Kaur asked a question

Subject: Physics, asked on on 30/4/14

Explain Ohm's law ??

Sanjay & 1 other asked a question

Subject: Physics, asked on on 20/6/15

what is html?explain in detail?

Akash Sharma asked a question

Subject: Physics, asked on on 26/9/17

Q.11. Two rings having same radius and mass are placed such that their centres are at a common point and their planes are perpendicular to each other. Find the moment of inertia of the system about an axis passing through the centre and perpendicular to the plane of one of the rings. (M = mass of each ring and R = radius).

Prithvi Raj asked a question

Subject: Physics, asked on on 9/12/14

define frequency modulation ? write the advantages of frequency modulation over amplitude modulation ?

Sky asked a question

Subject: Physics, asked on on 18/1/18

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^oC but greater than 0^o C (2) 0^o C
(3) 50^o C (4) more than 50^o C

Sanjita Prajapati asked a question

Subject: Physics, asked on on 2/1/12

what does line of sight communication means???

Mayank Singh asked a question

Subject: Physics, asked on on 6/1/17

Audio signals cannot be transferred directly into space.Why?
What's the process required to make the transmission of audio signals possible???
Are there any types???

Saloni Gupta asked a question

Subject: Physics, asked on on 16/2/13

Why do long distance radio broadcasts use shortwave bands?

rajesh2011 asked a question

Subject: Physics, asked on on 19/2/14

examples of sky wave propagation,ground wave rpopagation

Ayman asked a question

Subject: Physics, asked on on 7/11/15

With a block diagram explain elements of communication system.

Nandesh asked a question

Subject: Physics, asked on on 4/3/19

Frequency range for microwaves

Anand Verma asked a question

Subject: Physics, asked on on 26/10/13

What is sky wave propagation ?

Vyshnav Shanil asked a question

Subject: Physics, asked on on 24/4/19

please answer the question...

Ismail K asked a question

Subject: Physics, asked on on 2/2/14

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

Santosh Mishra & 1 other asked a question

Subject: Physics, asked on on 26/10/13

what is url?explain in detail?

Palak N Bhagat asked a question

Subject: Physics, asked on on 17/1/18

Name the device used for data tranmission from one computer to another. Justify the name.Using the device draw the block diagram for data communication.

deepakajithdbz... asked a question

Subject: Physics, asked on on 9/11/10

Difference between transducer and transmitter?

Sky asked a question

Subject: Physics, asked on on 18/1/18

Solve this:

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

Ravi Kant asked a question

Subject: Physics, asked on on 10/4/13

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

Kartik asked a question

Subject: Physics, asked on on 16/3/18

Solve this:

A carpenter has constructed a toy as shown in the adjoining figure. If the density of the material of the sphere is 12 times that of cone, the position of the centre of mass of the toy is given by :