a. 1980
b. 1981
c. 1982
d. None of these
a. 1980
b. 1981
c. 1982
d. None of these
a. Ultraviolet radiation
b. Sun’s ultraviolet (UV) radiation
c. Both a & b
d. None of these
a. Tin
b. Zinc
c. Copper
d. None of these
a. 2 August 1990
b. 17 January 1991
c. 28 February 1991
d. None of these
a. Bering Sea
b. Mediterranean Sea
c. Pacific Ocean
d. None of these
a. The Itaipu Dam
b. Grand Coulee Dam
c. Â Three Gorges Dam
d. None of these
