Tag: chemistry

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Questions Related to chemistry

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

Which of the following describes the effects of water scarcity on plants?

  1. The green character of the planet shall be lost.

  2. This may mean the end of all life.

  3. A world without plants shall mean no food, no oxygen, not enough rain, and innumerable other problems.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The following describes the effects of water scarcity on plants. The green character of the planet shall be lost. This may mean the end of all life, for a world without plants shall mean no food, no oxygen, not enough rain, and innumerable other problems.

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

 Careful management of water catchment leads to:

  1. emergency usage of water

  2. provides clean and fresh water

  3. decrease water requirement

  4. more wastage of water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During the time of emergency when the water becomes scarce, stored water helps to meet the daily requirement. 

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

Which of the following does not show water shortage?

  1. Taps running dry

  2. Long queues for getting water

  3. A family getting 3 buckets of water per person per day

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Option C does not show water shortage as if every person in the family is getting 3 buckets of water per day then this shows they have enough water of each. Option A and B show water shortage.

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

Rain water harvesting is:

  1. storing ground water by not using water from the well

  2. stop growing crops to save water

  3. allowing water to go into rivers and lakes

  4. collecting rainwater and storing it for later use
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rain water harvesting is collecting rainwater and storing it for later use. Its is a single method by which rainfall is collected for future usage. The collected rainwater may be stored, utilized in different ways or directly used for recharge purposes. It is the accumulation and storage of rainwater for re-use on site, rather than allowing it to run-off.

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

Situation which occurs due to occurrence of more rainfall than normal level or poor water distribution is :

  1. drought

  2. monsoon winds

  3. flood

  4. tropical rain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Floods occurs due to occurrence of more rainfall than normal level or poor water distribution.
As more rainfall can result in accumulation of water and when there is poor distribution of water it overflows and causes floods.
  • Drought is a dry condition in which there is shortage of water so it can't be the situation.
  • And winds does not occur due to rain.
  • Tropical rain is normal level rain which occurs in a region which cannot cause this situation of flood. 

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

Which one of the following statements is not an argument in favor of multi-purpose river projects? 

  1. Multi-purpose projects bring water to those areas which suffer from water scarcity

  2. Multi-purpose projects by regulating water flow help to control floods

  3. Multi-purpose projects lead to large scale displacements and loss of livelihood

  4. Multi-purpose projects generate electricity for our industries and our homes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

While multi-purpose river projects have benefits like flood control and power generation, the displacement of local populations and the loss of livelihoods are widely cited as negative social and environmental impacts, not arguments in favor of them.

Multiple choice chemistry quantitative chemistry molecular mass relative formula mass masses of atoms and molecules

1 ml ${ O } _{ 2 }$ will be equal to :

  1. $4g$ equivivalent oxygen
  2. $2g$ equivivalent oxygen
  3. $32g$ equivivalent oxygen
  4. $8g$ equivivalent oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Weight of $1$ mole of $O _2=32g$

$1g$ equivalent is the weight of substance which displaces $8g$ of $O _2$
$\therefore 32g$ of $O _2=\cfrac {32}{8}=4g$ equivalents of oxygen .

Multiple choice chemistry quantitative chemistry molecular mass relative formula mass masses of atoms and molecules

How many grams of carbon dioxide is dissolved in 1 litre bottle of carbonated water if the manufacturer uses a pressure of 2.4 atmosphere in the bottling process at 25 degree Celsius?

  1. 1.52

  2. 4.2

  3. 3.1

  4. 3.52
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to Henry's Law, the solubility of a gas is proportional to its partial pressure. Using the standard solubility of CO2 in water at 25 degrees Celsius and 1 atm, one can scale the value to 2.4 atm.