Tag: component of air - nitrogen

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

The approx. percentage of water in human body is:

  1. 80 %

  2. 65 %

  3. 70 %

  4. 40 %
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The approx. percentage of water human body is $70\%$. The average adult human body is $50-65\%$ water, averaging around $57-60\%$. The percentage of water in infants is much higher, typically around $75-78\%$ water, dropping to $65\%$ by one year of age. Body composition varies according to gender and fitness level because fatty tissue contains less water than lean tissue. 

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

Which of following statements is true?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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 $\text{C}$

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

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

  1. seas and oceans

  2. rivers, lakes, ice caps

  3. as ground water and in the atmosphere

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
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.