Ultraviolet rays coming from sun are filtered by?
a) Carbon Dioxide
b) Ozone Layer
c) Helium
d) None of these (more…)
a) Carbon Dioxide
b) Ozone Layer
c) Helium
d) None of these (more…)
a) Amnesia
b) Paralysis
c) Schizophrenia
d) None of these (more…)
a) Vinton Cerf and Bob Kahn
b) Wright Brothers
c) Larry Page and Sergey Brin
d) None of these (more…)
a) Albert Einstein
b) Charles Babbage
c) Thomas Edison
d) Douglas Engelbart (more…)
a) W. G. GRACE
b) Willis H. Carrier
c) Albert Einstein
d) Robert Hook (more…)