Which sewage treatment method is used to remove the settled and floating materials ?
Primary treatment
Secondary treatment
Tertiary treatment
Lateral treatment
Fresh water flows freely on some areas of the earth crust is called as ________________ .
Pond
Lake
Artesian well
Streams
Which is the chief component of natural gas ?
Methane
Propane
Ethane
Butane
_______ are absent in areas with water scarcity.
Tall trees
Bushy plants
Herbs
Shrubs
Name the liquid bio fuel made from vegetable oil and animal fat ?
Bioethanol
Biodiesel
Biogas
Green diesel
Which of the following changes occur in pond water during summer?
Decrease in oxygen content
Increase in oxygen content
Decrease in salt content
Increase in the number of diatoms
Which is called as the largest water resource ?
Lakes
River
Ocean
Which is known as the "Country of wind "?
Newzeland
Canada
London
Denmark
Most of the forests are seen in
Areas with sufficient water
Areas with water scarcity
Both
Areas with less sunlight availability
Pick the odd one out ?
Cholera
Dysentry
Typhoid
Scabies
