Answer to Question #115368 in Physics for Raman SHARMA

Question

State with reasons whether the following statements are True or False. (210=20)
i) Rastering converts serial signal into parallel to provide ease of communication.
ii) Line-of-sight communication is best used at visible light frequencies.
iii) Partition noise is more in diodes than transistors.
iv) The original signal can never be reproduced at the receiver end when frequency
modulation technique is used.
v) GSM is a spread spectrum technology.
vi) Flat screen displays allowed advent of HDTV.
vii) Uplink frequency in satellite communication is higher than downlink frequency.
viii) Compilers are higher language specific.
ix) Bus topology is the most rugged topology.
x) Blue tooth technology is useful for mobile phones only.

Answer 1

State with reasons whether the following statements are True or False. (210=20)

i) False: rastering means rendering of images using rasters (bitmaps)

ii) True: other frequencies allow diffraction and do not require line-of-sight.

iii) False: partition noise is observed when an electric current splits into several smaller currents. Transistor has more contacts, it is more noisy.

iv) True: frequency-modulated signals are reproduced with high quality, but they are not the originals.

v) False: is uses TDMA and FDMA. Spread-spectrum technologies do not use them.

vi) False: HDTV means high definition television, it deals with the size and quality of the screen, not its flatness.

vii) True: the uplink frequencies range from 27.5 to 31 GHz, downlink are between 10.7 and 13 GHz.

viii) True: compilers decode commands written in a particular language and turns them into machine language. Hence, they need to be higher-language specific.

ix) False: it allows flexible set-up, easy and comfortable use and maintenance.

x) False: it is also widely used in smart homes and cars.