As a result of which treaty, ozone hole in Antarctica is slowly healing
(A) Koyoto protocol
(B) Ottawa treaty
(C) Montreal protocol
(D) Oslo Accord
Montreal Protocol 1987 was__________
(A) Treaty among nations to reduce nuclear arsenals
(B) Climate control treaty
(C) Treaty to protect ozone layer
(D) Trade policy about tarrifs
Disolved oxygen (DO) in water should be
(A) 400 to 800 ppm
(B) 4000 to 8000 ppm
(C) 0.4 to 0.5 ppm
(D) 4 to 5 ppm
Why normal rain is slightly acidic
(A) due to presence of dust in air
(B) carbon dioxide and water in clouds react to form carbonic acid
(C) Ozone depletion
(D) All of these
The yellow colour in photochemical smog is due to the presence of____________
(A) Sulphur dioxide
(B) Carbon dioxide
(C) Nitrogen dioxide
(D) CFC’s
In 2013, Planck measured the age of the universe at ___________
(A) 13.82 billion years
(B) 4.53 billion years
(C) 4.6 billion years
(D) 4.53 billion years
When a single month has two full moons, the second moon is called________
(A) Super moon
(B) Blue moon
(C) Super blue moon
(D) Red moon