What is the difference between Bluetooth and Wi-Fi devices ? UPSC - 2011
A.
bluetoth used 2.4 GHz radio frequency
band where as Wi - Fi can use 2.4 GHz or 5 GHz frequency band
B.
bluethooth is used for wirless
local area networks (WLAN) only . Where as Wi - Fi is used for wireless wide area networks (WWAN) only
C.
when information is transmitted
between two devices using bluetooth technology, the devices have to be in the line of sight of each other , but when Wi - Fi technology is used the devices need not be in the line of sight of each other
D.
The statements (a) and (b) given
above are correct in this context.
A. bluetoth used 2.4 GHz radio frequency
band where as Wi - Fi can use 2.4 GHz or 5 GHz frequency band
15.
Which of the following is correct for the symbol of battery (i) Longer line in the symbol of an electric cell represents positive terminal (ii) Shorter line in the symbol of an electric cell represents negative terminal
Which of the following is correct while making a battery of two cells (i) The positive terminal of one battery is connected to the negative terminal of other battery (ii) The positive terminal of one battery is connected to the positive terminal of another battery
GPS-Aided Geo Augmented Navigation (GAGAN) uses a system of ground stations to provide necessary augmentation. Which of the following statements is/are correct in respect of GAGAN?
I. It is designed to provide additional accuracy and integrity.
II. It will allow more uniform and high quality air traffic management.
III. It will provide benefits only in aviation but not in other modes of transportation.
Select the correct answer using the code given below. UPSC - 2025
