1. "1984"
2. "1991"
3. " 1997"
4. " 2000"
1991
"1. "two internal refractions before emerging out of the drop"
2. "one internal refractions before emerging out of the drop"
3. " no internal refraction"
4. " either one or two internal refractions before emerging out of the drop"
one internal refractions before emerging out of the drop
"1. "nuclear power station"
2. " aluminum industry"
3. " brassware"
4. " sports goods"
nuclear power station
"1. "ethane "
2. " methane"
3. " carbon dioxide"
methane
"1. "Argentina, Australia, Belgium and South Africa"
2. "Chili, France and Japan"
3. "New Zealand, Norway, the former USSR, the UK and the USA"
4. "All of the above"
All of the above
"1. "May 31, 1981"
2. " April 17, 1983"
3. "December 21, 1999"
4. "December 28, 1995"
May 31, 1981
"1. "hydro-electric project "
2. " thermal power project"
3. " atomic power project"
4. " gas-fired power project"
gas-fired power project
"1. "by water erosion"
2. "by wind erosion"
3. " by weathering"
4. "of its mineral content"
of its mineral content
"1. "Pranab Mukherjee"
2. "Barak Obama"
3. "Mohommed Moorsi"
4. "Yusuf Raja Gilani"
Mohommed Moorsi
"1. "1"
2. "2"
3. 3
4. "All the facts are correct"
All the facts are correct
"