Pollution of Air and Water Class 8 Quiz Question with Answer
Pollution of Air and Water Class 8 Quiz Question with Answer. CBSE Class 8 Science Lesson 18 Mock Test.
1) Air contains the highest percentage of _____________
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) All of the above
Solution (B) Nitrogen
Explanation: the most abundant gas is nitrogen which makes up about 78% of air, Oxygen is the second most abundant gas at about 21% of air.
2) Which of the following has layer of the atoms?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) All of the above
Solution (D) All of the above
Explanation: There are four layers of the atmosphere, Troposphere, stratosphere, mesosphere and thermosphere.
3) Which of the following gases is poisonous?
A) Carbon monoxide
B) nitrogen
C) oxygen
D) None of these
Solution (A) Carbon monoxide
Explanation: carbon monoxide can kill you quickly, if the early signs of poisoning are ignored, a person may lose consciousness and be unable to escape the danger.
4) The solid or liquid particles suspension in air are called _________
A) Radiation
B) Aerosols
C) Smog
D) Troposphere
Solution (A) Radiation
Explanation: Aerosols is a collection of solid particles.
5) Which of the following is a “greenhouse gas” ?
A) Methane
B) Carbon dioxide
C) Water vapour
D) All of these
Solution (D) All of these
Explanation: carbon dioxide, methane and water vapour is greenhouse gas
6) Acid rain is contributed by which of the following gas?
A) Oxygen
B) Sulphur dioxide
C) Nitrogen
D) methane
Solution (A) Oxygen
Explanation: acid rain is contributed by sulphur dioxide, sulphur dioxide reacts with water vapour present in the atmosphere to form sulphuric acid present in the atmosphere to form sulphuric acid this acid dissolve in rainwater and fall to the earth in the form of acid rain.
7) Which of the following statements is correct?
A) Global warming statement can cause levels to rise dramatically
B) Ozone layer is absorbed ultraviolet rays
C) Reduction in the emission of greenhouse gases
D) All of these
Solution (D) All of these
Explanation: here, all statement is correct so the solution of the given is [D]
8) Which gas is responsible for the highest air pollution?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) None of these
Solution (B) Carbon dioxide
Explanation: carbon dioxide contributes highest to the air pollution of the earth’s atmosphere. Even though CO2 is essential to support living organisms, it is also a dangerous air pollutant, generated mostly by human activities such as deforestation.
9) Which of the following things helps in causing air pollution?
A) Transportation
B) Wildfires
C) Construction
D) All of the above
Solution (D) All of the above
Explanation: all of these things cause air pollution; hence option [D] is the correct answer.
10) Which gases are present in the stratosphere?
A) Nitrogen
B) Ozone
C) Co2
D) Methane
Solution (B) Ozone
Explanation: ozone gas (O3) is found in the stratosphere. Ozone gas is made up of oxygen molecules.
11) Coldest layer of atmosphere?
A) Stratosphere
B) Mesosphere
C) Stratosphere
D) All of the above
Solution (B) Mesosphere
The mesosphere is the coldest layer of the atmosphere with an average temperature of about -85 degree Celsius.
12) Which of the following is an example of aerosols?
A) Smoke
B) Smoge
C) Dust
D) All of these
Solution (D) All of these
Explanation: all are examples of aerosols hence the solution is [D].
13) Which layer of the atmosphere contains the ozone layer?
A) Stratosphere
B) Exosphere
C) Troposphere
D) None of these
Solution (A) Stratosphere
Explanation: stratosphere layer of atmosphere contains ozone layer.