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
Which type of radiations are absorbed by the upper layer of the atmosphere?
A Radio-waves
B Infrared
C Visible
D Ultraviolet
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
Which layer of of atmosphere contains the ozone layer?
A Mesosphere
B Stratosphere
C Troposphere
D Thermosphere
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
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
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 layer of atmosphere close the Earth's surface is called ----
A Exosphere
B Ionosphere
C Stratosphere
D Troposphere
The layer of atmosphere close the Earth's surface is called _
A Exosphere
B Ionosphere
C Stratosphere
D Troposphere

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