Tag: chemistry

Quizzes (490) Questions (9892)

Questions Related to chemistry

Multiple choice chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

Carbon dioxide exists in Earth's atmosphere as a:

  1. Metal

  2. Solid

  3. Trace gas

  4. Abundant gas
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon dioxide exists in Earth's atmosphere as a trace gas at a concentration of about $0.04$ percent $\left(400   ppm\right)$ by volume. A trace gas is a gas which makes up less than $1$% by volume of the Earth's atmosphere.

Multiple choice introduction to natural resources natural resources- air, water and land land air chemistry

Which is not dangerous for life?

  1. Nuclear blast

  2. Deforestation

  3. Biopollutants

  4. Ozone layer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Nuclear blast can cause the release of radiations which can cause cancer and the radioactive materials can lead to soil pollution. Deforestation results in soil erosion and the quality of soil is degraded in which the plants cannot grow. The biopollutants are the natural microbes which act as pollutants when there is an increase in the number. 
Ozone layer is present in the stratosphere over the Earths surface. This is a protective layer which prevents the entry of the harmful UV rays from the sun into the atmosphere. 
Thus, the correct answer is option D.  
Multiple choice introduction to natural resources natural resources- air, water and land land air chemistry

Greenhouse effect occurs in

  1. Mesosphere

  2. Troposphere

  3. Ionosphere

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The atmosphere is made up of five layers mainly, exosphere, thermosphere, mesosphere, stratosphere and troposphere. The troposphere is about 12 km thick and is found at ground level. Living organisms are found in this layer. Most of the human activities take place in this region as this is the region where human beings live. The percentage of poisonous gas like carbon dioxide, nitrogen oxide etc.  increases due to burning of fossil fuels which do not allow the heat to escape from the earth atmosphere and leads to increase in temperature and cause global warming.
So, the correct option is B.
Multiple choice introduction to natural resources natural resources- air, water and land land air chemistry land,labour, capital and entrepreneur how does production take place?
Don't press the panic button. Despite the crisis in Japan's plants, India must not take nuclear power off the table.
In view of recent nuclear blasts due to Tsunami in Japan, countries are:

  1. going to stop nuclear-energy plan

  2. devising methods to avoid this type of disaster

  3. stressing thermal energy plan

  4. stressing hydro-electric power
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

To avoid nuclear blasts due to Tsunami in Japan counteries are devising methods to avoid this types of disasters.

Multiple choice introduction to natural resources natural resources- air, water and land land air chemistry land,labour, capital and entrepreneur how does production take place?

The soil is formed by the breaking down of rocks by the action of _____.

  1. wind

  2. water

  3. climate

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

The soil is formed by breaking down of rocks by an action of wind, water and climates like thawing of water that seeped through rock and climatic changes such as weathering of rocks, landslides also causes breaking of big rocks. This is how soil is formed by all these natural processes.