evs quiz 2

Mining depends on

• Concentration of mineral only

• Ease of extraction

• transport facility

• All of these

This area has no permanent roads or settlements and is maintained primarily for its primitive character and non-motorized recreati

• Wilderness area

• primitive recreation area

• national park

• national forest

Floods can be prevented by

• Afforestation

• removing the top soil

• cutting the forests

• tilling the land

The resources which are inexhaustive and can be generated within a given span of time are called as

• Renewable resources

• Non-renewable resources

• Solar resources

• Non-solar resources

The forests are called as, Earth's

• Lungs

• Heart

• Kidneys

• Liver

About _____ million species are found in the tropical forest alone.

• 5

• 7

• 1

• 100

Out of the total water reserves of the world, about __________ is salty water (marine) and only _____ is fresh water.

• 97% and 3%

• 90% and 10%
• 80% and 20%
• 50% and 50%

A layer of sediment or rock that is highly permeable and contains water is called

• aquifer

• spring

• glacier

• seepage

When the concentration of nitrates in water exceeds 45mg/L, they become the cause of a serious health hazard called __________

• Luckemia

• Blue Baby Syndrome

• Cancer

• Paralysis

SNG can be produced from

• coal

• biomass

• petroleum cake

• all of the above