• Forms of water - class-VII
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Forms of water - class-VII

Description: forms of water
Number of Questions: 20
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Tags: biology air and atmosphere water a precious resource water let's play with water chemistry water: a precious resource rain: where does it come from environment evs water: a natural resource
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The freshwater stored in the ground is much more than that present in the rivers and lakes of the world.

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
  • Groundwater is the water found underground in the cracks and spaces in soil, sand, and rock. It is stored in and moves slowly through geologic formations of soil, sand, and rocks called aquifers.
  • Groundwater is the source of about 33 % of the water that county and city water departments supply to households and businesses (public supply).
  • Hence The freshwater stored in the ground is much more than that present in the rivers and lakes of the world is a true statement.
  • So, the correct answer is 'True'.

The process by which water from the surface of the earth moves to the atmosphere is:

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. cooling.

  2. distillation.

  3. evaporation.

  4. None of the above.

Show answer
Correct Option: C
Explanation:

The process by which water from the surface of the earth moves to the atmosphere is evaporation.

95% of the Earths water is stored in its:

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. glaciers

  2. oceans

  3. rivers

  4. ponds

Show answer
Correct Option: B
Explanation:

95% of the Earth's water is stored in its oceans, from where the water cycle starts. 

In water cycle, the maximum vaporization takes place:

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. from oceans

  2. from rivers

  3. from streams

  4. from plants

Show answer
Correct Option: A
Explanation:

86% of global evaporation occurs from the ocean due to its large surface area which directly comes in contact with sun rays and gives maximum vaporisation.


Hence, option A is correct.

Which of the following is not naturally occurring form of water?

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. Solid

  2. Liquid

  3. Vapour

  4. Semi-solid

Show answer
Correct Option: D
Explanation:

Water exists in liquid form upto  $100^0$C , at 100$^0$C it exists as vapour and at 4$^0$C it exists in solid form  as ice. So water exists in all the states or forms except semisolid, jelly state

So, the correct answer is 'Semi-solid'

Water is an extremely stable ____________.

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. atom

  2. element

  3. mixture

  4. compound

Show answer
Correct Option: D
Explanation:

Water is a stable compound. Components made up of two or more elements is called a compound. Water is made up of two elements namely hydrogen and oxygen.

Water produces hydrogen and oxygen in the ratio of :

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. 1:1

  2. 2:1

  3. 1:2

  4. 2:3

Show answer
Correct Option: B
Explanation:

Water molecular formula is $H _2O$. Water has 2 hydrogen and one oxygen atom. So it produces hydrogen and oxygen in the ratio 2:1.

Rainfall patterns depend on

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. The underground water table

  2. The number of water bodies in an area

  3. The density pattern of human population in an area

  4. The prevailing season in an area.

Show answer
Correct Option: B
Explanation:

Rainfall pattern will depend on number of water bodies in an area, as there will be large water bodies, (ocean, river) the rate of evaporation would be high, which will help to cause rain in the area.

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

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. Antarctica

  2. Polar ice

  3. Glaciers and Mountains

  4. Greenland

Show answer
Correct Option: B
Explanation:
More than 70% of world's fresh water is contained in Polar ice. These polar ice are present in the form of two sheets in Antartica and Greenland.
So, the correct answer is 'Polar ice'.

Water heats up ___________ and cools off ___________ than land.

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. More quickly, more quickly

  2. More quickly, more slowly

  3. More slowly, more quickly

  4. More slowly, more slowly

Show answer
Correct Option: D

What affected salamanders?

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. Acidity

  2. Pollutions

  3. Air pollution

  4. Water Pollutions

Show answer
Correct Option: A

How much did sea level rise in 20th century?

evs sources of water and water cycle groundwater and depletion of water table rain: where does it come from availability and forms of water the water cycle

  1. 1.3 mm/yr

  2. 1.8?mm/yr

  3. 1.7 mm/yr

  4. 1.9 mm/yr

Show answer
Correct Option: B

Water vapor is present in air only during the monsoon.

biology rain: where does it come from sources of water and water cycle availability and forms of water the water cycle

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

No, water vapor is present in the air during all seasons

The solid form of water is known as:

chemistry rain: where does it come from sources of water and water cycle availability and forms of water the water cycle

  1. fog

  2. dry ice

  3. ice

  4. snow

Show answer
Correct Option: C
Explanation:

The solid form of water is known as ice.

Evaporation is defined as:

chemistry rain: where does it come from sources of water and water cycle availability and forms of water the water cycle

  1. conversion of ice in water.

  2. conversion of water into water vapours.

  3. conversion of water vapours into the water.

  4. freezing of water into ice.

Show answer
Correct Option: B
Explanation:

When water is heated it absorbs energy and changes its state from liquid (water) to gas(water vapours). This process of converting water in vapours is known as vaporisation.

Which of the following processes is unsuitable for softening water possessing temporary hardness?

biology rain: where does it come from sources of water and water cycle availability and forms of water the water cycle

  1. Adding calcium hydroxide

  2. Filtration

  3. Boiling

  4. Distillation

Show answer
Correct Option: A
Explanation:

If you added calcium oxide to water, it would react and make calcium hydroxide. Calcium hydroxide is produced, however, when calcium oxide is mixed (or slaked) with water. Overall, nothing significant happens when you mic Ca(OH)2 with water, certainly no reaction occurs. So, the correct option is "A" (Adding calcium hydroxide).

Which of the following is the most important factor in balancing the amount of freshwater on earth?

evs rain: where does it come from sources of water and water cycle availability and forms of water the water cycle

  1. Water cycle

  2. Greenhouse effect

  3. Waste water treatment plant 

  4. Transpiration

Show answer
Correct Option: A
Explanation:

Water cycle is a continuous cycle in which water changes from water vapour in the atmosphere, through liquid water through condensation and precipitation and then back to water vapour through evaporation, transpiration and respiration. 

Among the given options, $A$ is the correct one. 

When water circulates through the water cycle it can be found in all the _________ form, at any given time somewhere on the earth.

evs rain: where does it come from sources of water and water cycle availability and forms of water the water cycle

  1. four

  2. two

  3. three

  4. six

Show answer
Correct Option: C
Explanation:

When water circulates through the water cycle it can be found in all the three forms, i.e., solid, liquid and gas at any given time somewhere on the earth. This continuous cycling of water in its three forms in nature keeps the total amount of water on earth constant even when the whole world is using it.

The circulation of water from surface of the earth to atmosphere and back to the surface is known as:

evs rain: where does it come from sources of water and water cycle availability and forms of water the water cycle

  1. water circle.

  2. water cycle.

  3. water round.

  4. None of the above.

Show answer
Correct Option: B
Explanation:

The circulation of water from surface of the earth to atmosphere and back to the surface is known as water cycle.

During water cycle, the water is circulated back from the earth in the form of:

evs rain: where does it come from sources of water and water cycle availability and forms of water the water cycle

  1. humidity.

  2. rain.

  3. vapour.

  4. None of the above.

Show answer
Correct Option: B
Explanation:

During water cycle, the water is circulated back from the earth in the form of rain or snow.

Hence, option B is correct.

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