Tag: composition of air

Questions Related to composition of air

Nitrogen is not a supporter of:

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

  1. Combustion

  2. Decomposition

  3. Both A and B

  4. none of these

Show answer
Correct Option: A
Explanation:

Nitrogen is not a supporter of COMBUSTION.
Nitrogen is a colorless, odorless, tasteless diatomic gas. It is found in Group 15 of the periodic table. It does not burn, does not support combustion, and is only slightly soluble in water. It is relatively inactive chemically, but many of its compounds display marked reactivity.

In solid state, nitrogen occurs as:

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

  1. Chile saltpeter

  2. Saltpeter

  3. Sal ammoniac

  4. All of these

Show answer
Correct Option: D
Explanation:

 In solid state, nitrogen occurs as chile saltpeter, saltpeter and sal ammoniac.
Chile saltpeter is sodium nitrate, $\displaystyle NaNO _3$.
Saltpeter is potassium nitrate, $\displaystyle KNO _3$
Sal ammoniac is ammonium chloride, $\displaystyle NH _4Cl$.

In combustion nitrogen work as:

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

  1. non supporter

  2. supporter

  3. highly supporter

  4. light supporter

Show answer
Correct Option: A
Explanation:

Nitrogen is a non supporter of combustion.
Nitrogen is a colorless, odorless, tasteless diatomic gas. It is found in Group 15 of the periodic table. It does not burn, does not support combustion.

Air has________ composition with________ oxygen at high attitudes.

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

  1. fixed, less

  2. variable, less

  3. variable, more

  4. fixed, more

Show answer
Correct Option: A
Explanation:

Air has fixed composition with less oxygen at high altitudes. Air contains 78% nitrogen and 21% oxygen and less than 1% He, Ar, Ne and water vapor content. This composition remains fixed at all locations but the oxygen becomes less dense at high altitudes so it is difficult to breathe in such low concentration of air.

During day time which of the following is most 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: A
Explanation:

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.

Rearing of silk worm is known as:

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

  1. Silviculture

  2. Sericulture

  3. Apiculture

  4. Horticulture

Show answer
Correct Option: B
Explanation:

Silviculture is growing and cultivation of trees.

Sericulture is production of silk and rearing of silkworms.
Apiculture is also called beekeeping.
Horticulture is the practice of garden cultivation and management.
Hence, option B is correct.

Which of the following statements is true regarding earth's atmosphere?

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

  1. It gets denser with increase in altitude

  2. It gets thinner with increase in altitude

  3. Its thickness is atleast one-fourth the radius of the earth.

  4. It contains no solid particles

Show answer
Correct Option: B
Explanation:

The earth's atmosphere gets thinner with the increase in altitude. The earth's atmospheric layers are Troposphere, Stratosphere, Mesosphere, Ionosphere, and Exosphere. Each layer has its own importance. 

Option (B) is correct.

Mountaineers carry oxygen cylinders with them because :

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

  1. oxygen supports combustion

  2. air becomes thinner as we go higher

  3. air is denser as we go  higher

  4. none of these

Show answer
Correct Option: B
Explanation:

Mountaineers carry oxygen cylinder along with them because when they climb mountains, as altitude increase, the amount of oxygen level in the atmospheric air decreases as trees are not found at higher altitude.


As a result, mountaineers suffer from dizziness. It can also lead to hypoxia.


Hence, te correct option is $\text{B}$

It is not proper to breathe through our mouth because:

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

  1. the dust particles would enter our bodies

  2. more carbon dioxide will be inhaled

  3. our throat will become sore

  4. we will catch cold easily

Show answer
Correct Option: A
Explanation:

It is not proper to breathe through our mouth because most of the dust particles can enter our body along with the air we breathe in. But breathing through nose does have this because nose has hair present which traps the dust particles.

The correct ascending order of gases as per their composition in air is:

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

  1. oxygen< carbon dioxide

  2. hydrogen < oxygen < nitrogen

  3. nitrogen < hydrogen < oxygen

  4. nitrogen < oxygen

Show answer
Correct Option: B
Explanation:

By volume dry air contains $78.09\%$ Nitrogen, $20.95\%$ Oxygen, $0.93\%$ Argon, $0.04\%$ Carbon dioxide and small traces of other gases.


Ascending order of gases as per their composition in air is-

Hydrogen $<$ Oxygen $<$ Nitrogen