Disolved oxygen (DO) in water should be?

Related Mcqs:

1. Which of the following organisms releases molecular oxygen into water?

   A. E.coli B. Phytoplankton C. Amoeba D. Salmonella Submitted by: Malik Asghar Hussain...

2. The source of oxygen in photosynthesis is

   A. water B. salts C. minerals D. glucose...

3. The human brain uses__________ percent of the total oxygen and blood in the body?

   A. 20 B. 12 C. 35 D. 48 Submitted by: ★ ɪʟʏᴀsɪʟᴜ ★...

4. Human beings use _______ liters of pure oxygen per day.

   A. 550 B. 2500 C. 1,050 D. 10,000 Submitted by: Muhammad Awais Tariq...

5. Which of the following is responsible for largest amount of oxygen on earth?

   A. Peat bogs B. Algae C. Trees D. None of these Submitted by: Malik Asghar Hussain...

6. __________ gas is released when coal is burnes in ln lack of Oxygen?

   A. Carbon Dioxide B. Methane C. Ethene D. Carbon Monoxide Submitted by: Rizwan Ahmed Panhwar...

7. Our atmosphere consists of___________ Oxygen approximately?

   A. 11% Oxygen approximately B. 21% Oxygen approximately C. 31% Oxygen approximately D. None of these Submitted by: Ameer Ali Mirani...

8. The salinity of sea water is determined by the amount of common salt (Sodium Chloride) in __________ of sea water.

   A. 1 gram B. 10 grams C. 1 kg D. 10 kg...

9. For seeing objects at the surface of water from a submarine under water, the instrument used is ________?

   A. Periscope B. Telescope C. Kaleidoscope D. Spectroscope Submitted by: Rashid Mehmood...

10. Sea water (Salt water) freezes at ?

    A. Same temperature as fresh water. B. Slightly higher temperatures than fresh water. C. Slightly higher temperature than fresh water. D. Sea water does not freeze Submitted by: Mansoor Ahmed Suhag...