Disolved oxygen (DO) in water should be? - PakMcqs

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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. Water is heated in a kettlE. The inside water is heated by convection. A person sitting near the fire receives heat by ________?

   A. Conduction B. Convection C. Radiation D. Reflection E. None of these...

10. Why are soft drink made with chilled water rather than water at room temperature?

    A. Ingredients dissolve better in chilled water B. Chilled water enhances the taste C. Chilled water attracts more carbon dioxide  D. Chilled water is more hygienic Submitted by: Ashfaque Ali Khoso...