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Environmental Science MCQ Questions and answers | EVS MCQ

Learn and practice General Knowledge questions and answers on Environmental Science MCQ with very easy and understandable explanations. EVS MCQ questions are very helpful different type of competitive ex Page-8 section-2

Each section contains 100 MCQs on Environmental Science .
71
As the air temperature increases, with no addition of water vapor to the air, the dew point will:
Discuss
Answer & Solution
Answer: Option A
Solution:
As the air temperature increases, with no addition of water vapor to the air, the dew point will remain the same.
72
As the air temperature increases, with no addition of water vapour to the air, the relative humidity will:
Discuss
Answer & Solution
Answer: Option D
Solution:
As air is cooled and no moisture is added, the relative humidity will increase until the air reaches saturation (100% RH). The temperature of the air when this occurs is called the dew point temperature.
73
Green House effect is caused by
Discuss
Answer & Solution
Answer: Option A
Solution:
Greenhouse effect, a warming of Earth's surface and troposphere (the lowest layer of the atmosphere) caused by the presence of water vapour, carbon dioxide, methane, and certain other gases in the air. Of those gases, known as greenhouse gases, water vapour has the largest effect.
74
If the air temperature remains constant, evaporating water into the air will ____ the dew point and ____ the relative humidity.
Discuss
Answer & Solution
Answer: Option A
Solution:
If the air temperature remains constant, evaporating water into the air will increase the dew point and increase the relative humidity.
75
If the earth's average surface temperature were to increase, the amount of radiation emitted from the earth's surface would ____, and the wavelength of peak emission would shift toward ____ wavelengths.
Discuss
Answer & Solution
Answer: Option A
Solution:
If the earth's average surface temperature were to increase, the amount of radiation emitted from the earth's surface would increase, and the wavelength of peak emission would shift toward shorter wavelengths.
76
The presence of high coliform counts in water indicates
Discuss
Answer & Solution
Answer: Option A
Solution:
The presence of high coliform counts in water indicate contamination by human wastes. Coliform bacteria or Escherichia coli is a bacteria that is present in human intestine. It is a useful bacteria. When people discharge fecal matter near water bodies these microorganisms enter water.
77
As it travels along the food chain, the concentration of DDT
Discuss
Answer & Solution
Answer: Option A
Solution:
As it travels along the food chain, the concentration of DDT increases.
78
Industrial melanism is an example of
Discuss
Answer & Solution
Answer: Option D
Solution:
Industrial melanism refers to the evolution of dark body colours in animal species that live in habitats blackened by industrial soot. The phenomenon has been documented in numerous species that hide from predators by blending in with their backgrounds. Peppered moths provide one example.
79
Coal is a __________ resource.
Discuss
Answer & Solution
Answer: Option C
Solution:
Coal is a deforestation resource.
80
Extensive planting of trees to increase forest cover is called
Discuss
Answer & Solution
Answer: Option A
Solution:
The process of extensive planting of trees or seeds in barren lands to increase forest cover is called as Afforestation.