Tag: natural cycles and resources

Questions Related to natural cycles and resources

By the process of infiltration ground water gets:

  1. cleared

  2. discharged

  3. recharged

  4. coloured


Correct Option: C
Explanation:

Infiltration is the process by which water on the ground surface enters the soil. By this process ground water gets recharged.

All the plants require nitrogen for:

  1. reproduction

  2. photosynthesis

  3. transpiration

  4. growth


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:

  1. Nitrogen

  2. Oxygen

  3. Hydrogen

  4. Water gas


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.

  1. True

  2. False


Correct Option: B
Explanation:

Nitrogen is not poisonous at normal atmospheric pressures.

Nitrogen is used in high-temperature thermometer :
  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.


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.

  1. True

  2. False


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.

  1. Oxygen

  2. Carbon dioxide

  3. Chlorine

  4. Nitrogen


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:

  1. Potassium, phosphorus and carbon

  2. Sodium, nitrogen and phosphorus

  3. Silica, nitrogen and phosphorus

  4. Potassium, phosphorus and nitrogen


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;

Lime water turns milky when exposed. to air and stirred. This shows that air contains:

  1. carbon dioxide

  2. hydrogen

  3. nitrogen

  4. oxygen


Correct Option: A
Explanation:

Lime water turns milky when exposed to air and stirred as lime water mixes with $CO _{2}$ and forms $CaCO _{3}$ (calcium carbonate) which turns the lime water milky. 

$CaO+CO _{2} \longrightarrow CaCO _{3}$