Tag: chemistry

Questions Related to chemistry

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

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

  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

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Correct Option: D
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.

Careful management of water catchment areas results in:

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

  1. more wastage of water

  2. less wastage of water

  3. deforestation

  4. none of these

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Correct Option: B
Explanation:

Careful management of water catchment areas results in more use and less wastage of water.

 Careful management of water catchment leads to:

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

  1. emergency usage of water

  2. provides clean and fresh water

  3. decrease water requirement

  4. more wastage of water

Show answer
Correct Option: A
Explanation:

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

Which of the following does not show water shortage?

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

  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

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Correct Option: C
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.

Rain water harvesting is:

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

  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

Show answer
Correct Option: D
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.

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

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

  1. drought

  2. monsoon winds

  3. flood

  4. tropical rain

Show answer
Correct Option: C
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. 

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

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

  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

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Correct Option: C

The relative atomic mass of $ Ne$ is $20.$ Its relative molecular mass is:

chemistry basic concepts of chemistry molecular mass relative formula mass masses of atoms and molecules

  1. $10$

  2. $20$

  3. $30$

  4. $40$

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Correct Option: B
Explanation:

The relative atomic mass of  $Ne$ is $20.$ Its relative molecular mass is also $20$ as Neon is mono-atomic.

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

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

  1. $4g$ equivivalent oxygen

  2. $2g$ equivivalent oxygen

  3. $32g$ equivivalent oxygen

  4. $8g$ equivivalent oxygen

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Correct Option: A
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 .

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?

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

  1. 1.52

  2. 4.2

  3. 3.1

  4. 3.52

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Correct Option: D