Tag: natural resources - air

Questions Related to natural resources - air

Dinitrogen and dioxygen are main constituents of air, but these do not react with each other to form oxides of nitrogen because:

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. the reaction is endothermic and requires very high temperature

  2. the reaction can be initiated only in presence of a catalyst

  3. oxides of nitrogen are unstable

  4. $N _{2}$ and $O _{2}$ are unreactive

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Correct Option: A
Explanation:

The main component of air are oxygen and they will only react together at a normal temperature. For the formation of oxides of nitrogen, a very high temperature is required. 

Clothes dry faster in summer than in monsoon days. Why?  

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. Because dry air is less humid

  2. Wet air is less humid

  3. Dry air is more humid

  4. None of these

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Correct Option: A
Explanation:

In monsoon there is lot of humidity in air as compared to summer. Hence, the Clothes dry faster in summer than in monsoon

Warm air is heavier than cold air. State whether the above statement is true or false and explain.

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. True, because warm air contains more heat

  2. True, because warm air molecules are separated by greater distances

  3. False, because molecules of warm air expand and become less dense

  4. False, because cold air contain extra temperature than hot air

Show answer
Correct Option: C
Explanation:

Warm air is lighter than cold air because they have more heat energy, which results in the increase in distances between the molecules. This decraeses the density, and hence makes it lighter than cold air.

During night time which is more prevalent?

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. Sea breeze

  2. Land breeze

  3. Both A & B

  4. None of these

Show answer
Correct Option: B
Explanation:

Land breeze is defined as a coastal breeze blowing at night from land to sea, caused by the difference in the rate of cooling of their respective surfaces.
Sea breeze is defined as a breeze blowing towards the land from the sea, especially during the day owing to the relative warmth of the land.

Sea and land breezes are caused because of:

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. Convection

  2. Cyclones

  3. Rains

  4. Conduction

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Correct Option: A
Explanation:

Sea and land breezes are caused because of an uneven heating of the earth and through convection currents.

So, the answer is Convection

Water droplets on grass and rocks is called:

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. Dew

  2. Snow

  3. Rain

  4. Smog

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Correct Option: A
Explanation:

Dew are tiny drops of water that form on cool surfaces at night, when atmospheric vapour condenses.

Nitrogen is the major constituent of air.

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Nitrogen is the major constituent of air. 

It constituents about $78\%$ of total volume of air. 

Argon is the major constituent of inert gases present in air.

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Argon is the most abundant and most used of the noble gases. Its chief uses are in metallurgy, where it provides an inert atmosphere in which hot metals can be worked. Because argon is so very unreactive, it prevents chemical reactions of the very hot metal being welded or forged.

Nitrogen constitutes nearly __ % of the atmosphere.

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. 45

  2. 78

  3. 21

  4. 0.03

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Correct Option: B
Explanation:

Nitrogen constitutes nearly 78% of the atmosphere.

Statement: Nitrogen is slightly heavier than air.


State whether the given statement is true or false.

biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

  1. True

  2. False

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Correct Option: B