1.First larger scale aquatic environmental issue occurred due to;
a.lead b.arsenic c. mercury d.cadmium
2.Firstly,aquatic pollution occurred in large ———-pipes
a.Greek b.Roman c.WestIndian c.American
3.Coal burning caused acidification in rivers and lakes in British isles ,by the end of;
a.90s b.1800s c.20th century d.80s
4.Acid rain is mainly due to;
a.fossilization b.commercialization c.extraction of ores d.industrialization
5.In, 20th century,heighted chimneys caused addition of oxides of ——– and ——— in air;
a.H2 and N2 b.C and S c.S and N2 d. none
6.In Japan hundreds of people died of mercury intoxification in;
a.1960 b.1956 c.1900 d.1906
7.Paper effluent discharged by Sweden and Finland in;
a.1960s b.1990s c.1940s d.2000
8.Fresh water volume on earth is;
a.1.5% b.2.8% c.1% d.2.5%
9.Earth contains ———-of surface water;
a.75% b.70% c.73% d.77%
10.Persistent organic pollutant, PCB stands for;
a.polycarbonatedbiphenyls b.polychemical bisulphate
c.polychlorinated biphenyl d.polychlorinated bisulphate
11.Earth contains———-of landwater;
a.35% b.30% c.25% d.26.5%
12.Basic toxicological research started in many countries in;
a.1900s b.1874 c.1800s d.1923
13.Which radioactive compound is a major source of radioactivity in water;
a.radium b.uranium c.gallium d.radon
14.Which of these are sources of aquatic toxicity;
a.water pollution b.metals and metalloids c.radiations d.all of them
15.———–fish stock was effected mainly due to oxides of N and S;
a.Labeo rohita b.Catla catla c.Salmonid d. Sirrihinus mirigala
