Tag: water and air and their importance

Questions Related to water and air and their importance

How is the percentage of oxygen in an atmosphere maintained?

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. consumption of carbon dioxide by plants

  2. consumption of oxygen by living beings

  3. consumption of oxygen by plants

  4. consumption of carbon dioxide by animals

Show answer
Correct Option: A,B
Explanation:

The percentage of oxygen in an atmosphere is maintained by consumption of carbon dioxide by plants and consumption of oxygen by living beings.


Hence the options A and B are correct.

All the plants require nitrogen for:

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. reproduction

  2. photosynthesis

  3. transpiration

  4. growth

Show answer
Correct Option: D
Explanation:
All the plants require nitrogen for growth. Nitrogen is found in healthy soils and give plants the energy to grow and produce fruit or vegetables. Nitrogen is part of the chlorophyll molecule, which gives plant their green colour and is involved in  creating food for the plant through photosynthesis.
So, the correct answer is 'growth'

Gas used as a refrigerant is:

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. Nitrogen

  2. Oxygen

  3. Hydrogen

  4. Water gas

Show answer
Correct Option: A
Explanation:

NITROGEN is used as a refrigerant. Nitrogen is a liquid at temperatures below 196.5 C and is used as a refrigerant for such things as preservation of blood and cooling of large computer systems, as well as some industrial uses. Being a liquid, it is more convenient to use for low temperature cooling than dry ice. Liquid nitrogen is also used in oil wells to build up pressure in order to force crude oil upward.

State True or False.
Nitrogen is a poisonous gas because animals die in its presence.

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Nitrogen is not poisonous at normal atmospheric pressures.

Nitrogen is used in high-temperature thermometer :
chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. To prevent vaporization of mercury.

  2. To improve conductivity of mercury.

  3. To maintain mercury to remain in its state.

  4. To increase the specific heat capacity of mercury.

Show answer
Correct Option: A,C
Explanation:
The principle used to measure temperature is that of the apparent thermal expansion of the liquid. An inert gas is used for mercury intended to high temperature. The thermometer is filled with an inert gas such as argon or nitrogen above the mercury to reduce its volatilization.

Hence, both options (A) and (C) are correct.

State True or False.
Liquid nitrogen is used as a refrigerant to preserve biological specimens.

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Liquid nitrogen is used as a refrigerant to preserve biological specimens because of its low temperature (-196$^o$) that does not cause cell breakdown or affect any other cellular mechanisms.

The potato chips manufacturers uses _____ gas to flush the chips bags to prevent the chips getting oxidised.

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. Oxygen

  2. Carbon dioxide

  3. Chlorine

  4. Nitrogen

Show answer
Correct Option: D
Explanation:

Oil and fat containing food items are flushed with nitrogen because the food containing fats and oil become rancid after sometime because of oxidation and give smell having a bad taste. Presence of nitrogen helps food to save from rancidity.

The three elements most usually contained in fertilizers are:

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. Potassium, phosphorus and carbon

  2. Sodium, nitrogen and phosphorus

  3. Silica, nitrogen and phosphorus

  4. Potassium, phosphorus and nitrogen

Show answer
Correct Option: D
Explanation:

Fertilizers are composed of three macronutrients, $NPK$ nitrogen, phosphorous and potassium.

Nitrogen ($N$): Leaf growth;
Phosphorus ($P$): Development of roots, flowers, seeds, fruit;
Potassium ($K$): Strong stem growth, movement of water in plants, promotion of flowering and fruiting;

An example for fossil fuel is 

commercial applications water and air and their importance natural resources and their types promotion of renewable resources protecting our environment

  1. Copper

  2. Iron

  3. Magnesium

  4. Coal

Show answer
Correct Option: D

Which one of the following is a renewable source of energy?

commercial applications water and air and their importance natural resources and their types promotion of renewable resources protecting our environment

  1. Natural gas

  2. Geothermal energy

  3. Diesel

  4. Timber

Show answer
Correct Option: B
Explanation:

Geothermal energy is the heat energy which is obtained from the interior of the Earth. However, this energy is not equally available everywhere and is concentrated in some parts of the world such as natural geysers. This is a natural and renewable source of energy that can be used for heating processes in various activities.

Thus, the correct answer is option B.