Garbage in, garbage out Worksheet-6

Garbage in, garbage out Worksheet-6


Multiple-Choice Question:

  1. Which of the following things can be recycled?

(a) Aluminum soda cans                 (b) Plastic milk jugs

(c) Cereal boxes                                (d) All of these


  1. Mercury is a hazardous chemical. Which of the following does not contain mercury?

(a) Fluorescent light bulbs             (b) Thermometers

(c) Blinking lights in sneakers       (d) solar lamps


  1. Most of the trash our family throws away every day ends up into _______.

(a) Compost                                      (b) Landfills

(c) Humus                                         (d) All of these


  1. Biochemical oxygen demand is a measure of how much dissolved oxygen is being consumed, as microbes break down organic matter. A high demand can indicate that levels of dissolved oxygen are falling, with potential danger to the water body’s biodiversity. Which industry sector produces the largest amount of wastes that have high oxygen demand?

(a) Food processing industries     (b) Mining and construction

(c) Power-generation                      (d) Automobile


  1. Silicosis is caused in the:

(a) Stone crushers                           (b) Storage battery industries

(c) Textile industry                          (d) Sugar industry 


  1. Pathogenic (harmful) bacteria enter wastewater, primarily from:

(a) Industrial waste     

(b) Both industrial & domestic waste

(c) Infiltration from surrounding soils

(d) Domestic waste


  1. The best method for disinfection of swimming pool water is:

(a) Chlorination                              (b) UV rays treatment    

(c) Heating                                       (d) Filtration   


  1. When the fluoride concentration in water exceeds 1.5 mg/l or so, the disease that may be caused is:

(a) Poliomyelitis                              (b) Fluorosis  

(c) Dental carries in children        (d) Met hemoglobinemia


  1. The safe permissible limit of sulphates in domestic water supplies is:

(a) 200 mg/l        (b) 100 mg/l        (c) 300 mg/l        (d) 400 mg/l    


  1. Presence of high algal content in water indicates that water is:

(a) Soft                 (b) Hard               (c) Acidic             (d) Alkaline


Answer Key:

  1. (d)
  2. (d)
  3. (b)
  4. (a)
  5. (a)
  6. (d)
  7. (a)
  8. (b)
  9. (a)
  10. (c)