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_________ is the first country to have phased out the CFCs and HCFCs which are responsible for the depletion of the ozone layer.
Atmospheric ozone layer which protect us from UV-B and C is getting depleted most by addition of
Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
Which layer of of atmosphere contains the ozone layer?
When is International day for Preservation of Ozone layer observed?
When is the International Day for the Preservation of the Ozone Layer, recognized by the UN observed?
International Day for the Preservation of the Ozone Layer is observed on -
When is 'International Day for the Preservation of the Ozone Layer' observed?
A special lottery is to be held to select the student who will live in the only deluxe room in a dormitory . There are 100 seniors, 150 juniors and 200 sophomres who applied. Each senior's junior's name , 2 times; and each sophomres who applied. Each senior's name is placed in the lottery 3 times; each junior's name ,2 times name, 2 times ; and each sphomore's name , 1 time . What is the probability that a senior's name will be chosen?
Which of the following is a device designed to protect electrical devices from voltage spikes?