Tag: safety and first aid

Questions Related to safety and first aid

What is chemical formula of water?

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

  1. $H _{2}SO _{4}$

  2. $H _{2}O$

  3. $H _{2}S$

  4. $H _{2}$

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Correct Option: B

What reduces water quality?

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

  1. Temperature

  2. Nutrients

  3. Water Vapours

  4. Waste products

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Correct Option: A

Which region of Africa was most involved in drought?

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

  1. Somalia

  2. Ethiopia

  3. Sahel Regions

  4. Eritrea

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Correct Option: C
Lakes and river water do not freeze suddenly in the winters.
evs - i sources of water the lithosphere and the hydrosphere first aid safety and first aid

  1. True

  2. False

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Correct Option: A
Explanation:
Lakes and river do not suddenly freeze in the winters.
While water is moving, if the temperature drops below zero it doesn't freeze. Fast moving rivers are less likely to freeze. For lakes, water's density behaviour protects them from freezing. When lakes freeze, the ice stays at the top. This insulates the remaining water from the colder air above. But it does not freeze completely
Thus, the correct answer is option A.

Which one of the following is not a reason for shortage of usable water?

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

  1. Over exploitation

  2. Climate change

  3. Deforestation

  4. Decrease in sea level

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Correct Option: D
Explanation:

Water shortage is the water scarcity that may be caused by altered weather patterns including droughts or floods, increased pollution, and increased human demand and overuse of freshwater. Sea water cannot be used for daily activities because of the salt content. Thus, the correct answer is option D.

What affects velocity and surface expansion of river?

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

  1. Dissolved Oxygen

  2. Turbidity

  3. Currents

  4. Hydrography

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Correct Option: D

More than 70% of world's fresh water is present in

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

  1. Ocean

  2. Polar ice

  3. Glaciers and Mountains

  4. Greenland

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Correct Option: B
Explanation:

The Oceans hold about 97% of water, and the Glaciers and polar ice caps hold another 2%. The polar ice caps contain 77% of the world's fresh water supply and another 22% is trapped in the ground which leaves only 3% of the world’s fresh water supply in lakes and rivers.

Therefore, the correct answer is option B.

The fresh water is continually being renewed and recharged through

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

  1. Hydrological cycle

  2. Carbon cycle

  3. Nitrogen cycle

  4. Life cycle

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Correct Option: A
Explanation:

The hydrological cycle is a prominent method to rejuvenate the fresh water resources. It involves the evaporation of water into water vapour by the heat of the sun which further condenses into tiny water droplets which fall on the earth as rain. This continuous recycling of water leads to recharging of the water resources. 

Which of the following play a very important role in causing rainfall ?

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

  1. Animals

  2. Plants

  3. Factories

  4. Vehicles

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Correct Option: B
Explanation:

Transpiration in plants plays a vital role in the water cycle. The plants transpire and lose water in the form of gases from its aerial parts which increases the moisture content in the atmospheric air. So, the air gets saturated with moisture at a faster rate and causes rainfall. Thus, the correct answer is option B.

Which of the following processes is involved in the water cycle?

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

  1. Evaporation, hibernation and dehydration

  2. Evaporation, condensation and precipitation

  3. Paddling, swimming and drinking

  4. Bathing, sunning and drinking

Show answer
Correct Option: B
Explanation:

The hydrological cycle is a prominent method to rejuvenate the fresh water resources. It involves the evaporation of water into water vapour by the heat of the sun which further condenses into tiny water droplets which fall on earth as rain. Thus, the process like evaporation and condensation and precipitation plays an important role.

So, the correct answer is option B.