Tag: evs

Questions Related to evs

What are the advantages of water stored in the ground than pond water?

evs water in our life where do we get water from? why conserve water uses of water

  1. It does not evaporate.

  2. It spreads out to recharge wells.

  3. Provides moisture for vegetation over a wide area.

  4. All of the above.

Show answer
Correct Option: D
Explanation:
The advantages of water stored in the ground than pond water:
(a) It does not evaporate
(b) It spreads out to recharge wells.
(c) Provides moisture for vegetation over a wide area.
(d) It is protected from contamination by animal and human wastes.
(e) It prevents breeding of insects.
Therefore, the correct answer is option D.

Largest amount of fresh water is found in

evs water in our life where do we get water from? why conserve water uses of water

  1. Lakes and streams

  2. Underground

  3. Polar ice and glaciers

  4. Rivers

Show answer
Correct Option: C
Explanation:

Over 68 percent of freshwater is found in polar ice & glaciers, while 30 percent is found in ground water, 0.3 percent is found in surface water of lakes rivers & ponds

So, the correct answer is 'Polar ice and glaciers'

The salinity of sea water is

evs water in our life where do we get water from? why conserve water uses of water

  1. $2.5$%

  2. $3.5$%

  3. $4.5$%

  4. $5.5$%

Show answer
Correct Option: B
Explanation:

Sea water has a salinity of 3.5% i.e. the sea water contain about 35 grams of dissolved salt per kg of water ( about 1 litre of water ). This salinity is because of the rivers that carry chemical/salts dissolved out of rocks and soil. NaCl makes the most of this dissolved salt. 

So, the answer is option B

Of the total fresh water, ground water constitutes

evs water in our life where do we get water from? why conserve water uses of water

  1. 90%

  2. 10%

  3. 30%

  4. 44.2%

Show answer
Correct Option: C
Explanation:

Percentage of fresh water in the hydrosphere is 2.5%. Out of this, about 68% of the fresh water is found in icecaps and glaciers and about 30% is found in ground water. About 98.5% of water in the hydrosphere is salt water.

Thus, the correct answer is '30%.'

The formation of ________ is the most characteristic feature in upper course of a river

evs water in our life where do we get water from? why conserve water uses of water

  1. landslide

  2. canyons

  3. gorges

  4. waterfalls

Show answer
Correct Option: D

More than 70% of world's freshwater is contained in

evs water in our life where do we get water from? why conserve water uses of water

  1. Antarctica

  2. Glaciers and mountains

  3. Greenland

  4. Polar ice

Show answer
Correct Option: D
Explanation:

The oceans hold about 97% of water and the glaciers and polar ice caps hold another 2% of the total water on Earth. 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. 

Pick the correct statement.
I. The estuaries are semi-enclosed coastal body of water, which has a free connection with the open sea.
II. Estuaries may be considered as ecotones between the fresh and marine habitats.
Ill. The Estuaries are salt water lakes.
IV. The estuaries are fresh water lakes.

evs water in our life where do we get water from? why conserve water uses of water

  1. I and II are correct.

  2. II and III are correct.

  3. III and IV are correct.

  4. I, II and III are correct.

Show answer
Correct Option: A
Explanation:

Estuaries are unique plant and animal communities that have adapted to brackish water mixture of fresh water draining from the land and salty seawater. However, there are also several types of entirely freshwater ecosystems that have many similar characteristics to the traditional brackish estuaries. Estuaries may be considered as ecotones between the fresh and marine habitats.

Residence time of water in the atmosphere is

evs water in our life where do we get water from? why conserve water uses of water

  1. 10 days

  2. 20 days

  3. 28 days

  4. 35 days

Show answer
Correct Option: A
Explanation:
Residence time is defined as the amount time a fluid, example water spends in a particular area/space. The residence time of the water is estimated at 10 days in the atmosphere.  
So, the correct answer '10 days'

In how many forms did the earlier Indian philosophers classify matter?

evs look, learn and experience brief introduction to atoms of elements elements and atoms introduction of atom

  1. 2

  2. 6

  3. 7

  4. 5

Show answer
Correct Option: D
Explanation:

Early Indian philosophers classified matter in the form of five basic elements – the “Panch Tatva”– air, earth, fire, sky and water.

Sub atomic particles of atoms are:

evs look, learn and experience brief introduction to atoms of elements elements and atoms introduction of atom

  1. protons

  2. electrons

  3. neutrons

  4. all of these

Show answer
Correct Option: D
Explanation:

Subatomic particles are particles that are smaller than the atom. Protons, neutrons, and electrons are the three main subatomic particles found in an atom.