Related Questions

_________ is the first country to have phased out the CFCs and HCFCs which are responsible for the depletion of the ozone layer.
A Denmark
B Germany
C France
D Spain
Atmospheric ozone layer which protect us from UV-B and C is getting depleted most by addition of
A chlorofluorocarbon
B carbon monoxide
C carbon dioxide
D sulpur dioxide
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
Which layer of of atmosphere contains the ozone layer?
A Mesosphere
B Stratosphere
C Troposphere
D Thermosphere
When is International day for Preservation of Ozone layer observed?
A September 16
B July 4
C January 23
D May 1
When is the International Day for the Preservation of the Ozone Layer, recognized by the UN observed?
A 11 December
B 16 September
C 8 March
D 9 August
International Day for the Preservation of the Ozone Layer is observed on -
A 17 September
B 16 September
C 17 October
D 16 November
When is 'International Day for the Preservation of the Ozone Layer' observed?
A September 16
B July 4
C January 23
D May 1
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?
A 18
B 38
C 48 
D 28
Which of the following is a device designed to protect electrical devices from voltage spikes?
A Voltage unloader
B Surge protector
C Heat protector
D Current unloader

Next steps