Tag: safety and first aid

Questions Related to safety and first aid

Which of the following are essential for the maintenance of balance in the ecosystem?

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

  1. Water cycle

  2. Carbon cycle

  3. Nitrogen cycle

  4. All of these

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Correct Option: D
Explanation:

Water cycle, carbon cycle and nitrogen cycle are essential to maintaining balance in an ecosystem. Water evaporates due to heating and gets converted into water vapour. The vapours cool down and return back to earth as rain.

Carbon cycle maintains equilibrium between oxygen and carbon dioxide concentration in the atmosphere. Photosynthesis utilises the carbon dioxide and releases oxygen while the respiration utilises oxygen and give back carbon dioxide.
The nitrogen cycle is the process by which atmospheric nitrogen is fixed by the plants in form of nitrates and nitrites which are further released back to the atmosphere by the process of nitrification.
So, the correct answer is option D

Water vapour in the clouds undergoes ............ and comes down as rain.

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

  1. Evaporation

  2. Condensation

  3. Precipitation

  4. Percolation

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Correct Option: B

Identify the man made calamities.

evs safety and first aid the lithosphere and the hydrosphere first aid the atmosphere

  1. Flood

  2. Earthquake

  3. Tornado

  4. Global warming

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Correct Option: D

Deforestation and pollution are the main causes of drought.

evs safety and first aid the lithosphere and the hydrosphere first aid the atmosphere

  1. True

  2. False

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Correct Option: A

The forest fire is a man made calamity whereas fire is a natural calamity.

evs safety and first aid the lithosphere and the hydrosphere first aid the atmosphere

  1. True

  2. False

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Correct Option: B

The groups of small rivers form bigger river is called as

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

  1. Iceberg

  2. Lagoon

  3. Estuaries

  4. Tributaries

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Correct Option: D

Lakes get water from 

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

  1. Ocean

  2. River

  3. Underground spring

  4. Icebergs

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Correct Option: C

Which of the following forms river?

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

  1. Rill

  2. Brooks

  3. Streams

  4. All of the above

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Correct Option: D

What is an aquifer?

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

  1. Underground lake

  2. Underground river

  3. Where water goes into ground

  4. None of the above

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Correct Option: C

Total earth's surface covered by water is

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

  1. 71%

  2. 60%

  3. 85%

  4. 50%

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Correct Option: A
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.