Climate change and Global Warming MCQs with Explanations
Climate change and global warming are among the most pressing environmental challenges facing the world today. This topic explains their causes, impacts, mitigation strategies and international efforts to address climate change.
Which among the following gases is most responsible for global warming?
Correct Answer:
(C) Carbon-dioxide
Greenhouse gases in the environment are water vapour, Carbon Dioxide, Methane, Nitrous oxide and Chlorofluorocarbons. Among these, carbon dioxide is most responsible for global warming as its concentration in the environment is more as compared to other greenhouse gases. Notably, the concentration of carbon dioxide is increasing in the atmosphere.
Ques: 2
As a result of global warming there has been:
Better global communication
Melting of glaciers
Flowering of mango trees before times
Adverse impact on health
Select your answer from the code given below:
Codes :
Correct Answer:
(B) 2, 3 and 4 are correct
As a result of global warming, glaciers are melting worldwide. Species that depend on one another may become out of sync. For example, plants could bloom earlier than their pollinating insects become active. Global warming would have an adverse impact on human health. The main categories of health risks include (i) Direct-acting effects (ii) Impacts mediated via climate-related changes in ecological systems and relationship (eg; crop fields, mosquito ecology, marine productivity).
Ques: 3
Global Warming is caused due to the emission of:
Correct Answer:
(B) Carbon Dioxide
Global warming is primarily a problem of too much carbon dioxide in the atmosphere. This carbon overload is caused mainly when we burn fossil fuels like coal, oil and gas or cut down and burn forests. The presence of carbon dioxide in the atmosphere was 315 PPM (Parts per million) in 1950. Currently, it has crossed 415 PPM. If the increase of carbon dioxide continues in the atmosphere at this speed, it will reach approximately 650-950 PPM by the end of the 21st century. This will raise the earth's temperature by 6°C.
Ques: 4
Which one of the following is the most fragile ecosystem that will be first affected by global warming?
Correct Answer:
(A) The Arctic and Greenland Ice sheet
The Arctic and Greenland ice sheet are the most fragile ecosystem that will be first affected by global warming. The melting of ice in this area will also affect the entire earth.
Ques: 5
Which of the following is not related to the astronomical theories of climate change?
Correct Answer:
(D)
Solar irradiance
Astronomical theory of climate change was propounded in 1920 by astronomer Milutin Milankovic. It states that the variation in eccentricity, axial tilt and precession of the Earth’s orbit determines climatic patterns on Earth through orbital forcing. Hence, solar irradiance is not concerned with this theory.
Ques: 6
Who had suggested that shifting Earth on its axis is one of the factors, responsible for the climatic change?
Correct Answer:
(B) Milutin Milankovic
According to the astronomical theory of climate change, Earth's movement produces an effect on climate change. In 1920, Serbian geophysicist and astronomer Milutin Milankovic theorized that variation in eccentricity, axial tilt and precession of the earth's orbit results in cyclical variation in the solar radiation reaching the earth. This orbital forcing influences climatic pattern on earth.