Tag: first aid

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Questions Related to first aid

Multiple choice evs - i sources of water the lithosphere and the hydrosphere first aid safety and first aid

What is an aquifer?

  1. Underground lake

  2. Underground river

  3. Where water goes into ground

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An aquifer is an underground body of permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt) from which groundwater can be usefully extracted using a water well. Since none of the specific choices like underground lake or river correctly define an aquifer, none of the above is correct.

Multiple choice evs - i sources of water the lithosphere and the hydrosphere first aid safety and first aid

Total earth's surface covered by water is

  1. 71%

  2. 60%

  3. 85%

  4. 50%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

71% of earth's surface is covered with water and 29% covered with land. This percentage of water is not only obvious sources of water like lakes, ponds, oceans but also the obvious sources of water like water in the air, frozen icecaps, glaciers, snow and underground water.

Therefore, the correct answer is option A.

Multiple choice evs sources of water the lithosphere and the hydrosphere first aid safety and first aid

Biochemical Oxygen Demand (BOD) in a river water :

  1. Increases when sewage gets mixed with river water

  2. Remains unchanged when algal bloom occurs

  3. has no relationship with concentration of oxygen in the water

  4. Gives a measure of Salmonella in the water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

BOD measures the amount of oxygen required by aerobic microorganisms to decompose organic matter. Sewage contains high levels of organic matter, which increases microbial activity and thus increases BOD.

Multiple choice evs sources of water the lithosphere and the hydrosphere first aid safety and first aid

What happens when rain falls on soil without vegetational cover?

  1. Rain water percolates in soil efficiently

  2. Rain water causes loss of surface soil

  3. Rain water leads to fertility of the soil

  4. Rain water does not cause any change in soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Vegetation cover on the ground helps to hold the soil in place. It also helps in percolating water into the deeper layers of the soil. The absence of vegetational cover may lead to soil erosion.

So, the correct answer is option B.

Multiple choice evs sources of water the lithosphere and the hydrosphere first aid safety and first aid

Abundant source of inonazite sands are found on the sea shores of

  1. Maharashtra

  2. West Bengal

  3. Tamil Nadu

  4. Kerala
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Kerala's coastline, particularly in areas like Chavara and Manavalakurichi, has significant deposits of monazite sands (likely 'inonazite' is a typo). These mineral sand deposits contain rare earth elements and thorium. Maharashtra, West Bengal, and Tamil Nadu have other mineral resources but are not the primary source of these specific sands.