Tag: natural cycles and resources

Questions Related to natural cycles and resources

Water occurs in _____ state.

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. free

  2. combined

  3. Both A and B

  4. None of the above

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Correct Option: C
Explanation:

Water occurs in both free and combined state. In free state in the form of lakes, rivers and in the combined state in the form of body fluids.

Human body contains approximately_________of water.

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. 50%

  2. 60%

  3. 70%

  4. 80%

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Correct Option: C
Explanation:

Human body contains approximately 70% of water.

The occurrence of water is maximum(in percentage terms) in:

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. lakes

  2. oceans

  3. rivers

  4. ground

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Correct Option: B
Explanation:

Water occurs in oceans in maximum amount.

Water occurs in combined state in:

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. cotton

  2. anhydrous salts

  3. vegetables

  4. rocks

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Correct Option: C
Explanation:

Fruits and vegetables contain large quantities of water in proportion to their weight. When these foods are eaten, the water can be absorbed by the body. These water found in Vegetables in combined state.

Which of the following water is fit for use:

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. fresh water

  2. ocean water

  3. distilled water

  4. none of these

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Correct Option: A
Explanation:

Most of this water present on earth in different sources is not fit for human consumption. The water that is fit for use is freshwater. 

The surface of the earth has_______of its total area as water.

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. two-thirds

  2. one-thirds

  3. two-fifths

  4. one-tenths

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Correct Option: A
Explanation:

About $71\%$ of earth's surface is covered by water.

Oceans hold about $96.5\%$ of all earth's water.
The surface of the earth has two-thirds of its total area as water.

Which of following statements is true?

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. The salinity of rivers increases with time

  2. The salinity of rivers decreases with time

  3. The salinity of seas increases with time

  4. The salinity of seas decreases with time

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Correct Option: C
Explanation:

A falling of rain on earth causes breaking up of rocks and transferring their minerals to the ocean, the ocean becomes saltier and by evaporation, water evaporates leaving salt in the oceans.


So, by this, we can say that salinity of increases with time.

Hence, the correct option is $\text{C}$

Almost all the water on the earth is contained in the:

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. seas and oceans

  2. rivers, lakes, ice caps

  3. as ground water and in the atmosphere

  4. all of these

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Correct Option: D
Explanation:

Almost all the water on the earth is contained in the oceans, seas, rivers, lakes, ice caps, as ground water and in atmosphere as water vapour.

Option (D) is the correct answer.

The main source of water for perennial rivers is in the form of:

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. lakes

  2. rain water

  3. snow

  4. dams

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Correct Option: C
Explanation:

Perennial rivers flows continuously throughout the year irrespective of seasons. Mostly they originates from the mountain and water is fed by melting of glaciers. These river get water by rain in rainy season, melting of ice in summer and by snow in winter.

Which of the following elements would give water on burning?

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. Hydrogen

  2. Oxygen

  3. Carbon

  4. Nitrogen

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Correct Option: A
Explanation:

In a flame of pure hydrogen gas, burning in air, the hydrogen (H$ _2$) reacts with oxygen (O$ _2$) to form water (H$ _2$O) and releases energy. If carried out in atmospheric air instead of pure oxygen, as is usually the case, hydrogen combustion may yield small amounts of nitrogen oxides, along with the water vapour.


Hence, the correct option is $\text{A}$