Environmental Science Practice Test 130
Hydrosphere MCQ (Multiple Choice Questions) PDF - 130
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Hydrosphere Questions and Answers PDF Download: Quiz 130
MCQ 646: What makes sea water not to be safe for drinking ?
- High salt concentration
- High minerals
- Marine water pollution
- Density of saewater
MCQ 647: What is an approximate percentage of dissolved solid in seawater?
- 0.045
- 0.035
- 0.045
- 0.025
MCQ 648: Which three elements constitute 90% of the sea water?
- Cl, Na, Mg
- S, Ca, K
- Cl, S, Si
- C, K, O
MCQ 649: The secondary treatment reduces the BOD, ranges from
- 20-50%
- 40-70%
- 70-80%
- 70-95%
MCQ 650: 50% of the incident energy is lost due to:
- Consumers
- Producers
- Microorganisms
- Planktons
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