Related Questions

Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
A 3, 3, 1, 7
B 3, 2, 1, none
C 3, 2, 1, 7
D 3, 3, 2, none
E All of the above
In upper layer of atmosphere ozone is formed by
A The action of ultraviolet rays on oxygen
B The combination of oxygen molecules
C Subjecting oxygen to high pressure
D The action of nitrogen on oxygen in atmosphere
Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A Solar ultraviolet radiation
B Solar infrared radiation
C CO2 in the air
D SO2 in the air
The upper layer of atmosphere is called the
A Stratosphere
B Troposphere
C Ionosphere
D None of these
Which layer of of atmosphere contains the ozone layer?
A Mesosphere
B Stratosphere
C Troposphere
D Thermosphere
A fragment of solid matter which enters the upper atmosphere from outer space almost disintegrating before reaching the earth's surface is
A Meteorite
B Asteroid
C Meteor
D Comet
the wzone in the upper layers of Earth's atmosphere is beneficial, ____ animal and plant life from dangerous ultraviolet readittion
A protecting
B withdrawing
C thwarting
D displacing
An upper air wind system with very high velocities in certain parts of the atmosphere is called ________
A A cyclone
B An anticyclone
C Jet stream
D A tsunami
নিচের কোন তড়িৎ-চুম্বকীয় বিকিরণের কম্পাঙ্ক সবচেয়ে কম?(which of the following electromagnetic radiations has the lowest frequency?)
A গামা (Gamma)
B অবালোহিত (Infrared)
C অতিবেগুনী (Ultraviolet)
D এক্স-রে (X-Ray)
If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?
A lUV < lIR < lVIS
B lUV > lVIS > lIR
C lUV > lIR > lVIS
D lUV < lVIS < lIR

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