Comprehension
Answer the following question.
Given below are the forecasts of the World and Asian energy demand for the years 1990, 2000 and 2010 AD. The demand is given in million barrels per day, crude oil equivalent.
Question: 1
Over 1990–2010, which two fuels meet more than 60 percent of the total energy demand of both World and Asia?
Over 1990–2010, which two fuels meet more than 60 percent of the total energy demand of both World and Asia?
Show Hint
Always check the percentage share of each component against the total to compare proportions accurately.
Updated On: Aug 6, 2025
- Petroleum \& Natural Gas
- Petroleum \& Solid Fuels
- Natural Gas \& Solid Fuels
- None of the above
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The Correct Option is B
Solution and Explanation
From the table:
World (2010): Petroleum = 80, Solid Fuels = 75, Total = 250
Their sum = 155, which is 62% of total (155/250).
Asia (2010): Petroleum = 15, Solid Fuels = 10, Total = 33.3
Their sum = 25, which is approximately 75%.
Hence, Petroleum \& Solid Fuels together account for more than 60% in both regions.
World (2010): Petroleum = 80, Solid Fuels = 75, Total = 250
Their sum = 155, which is 62% of total (155/250).
Asia (2010): Petroleum = 15, Solid Fuels = 10, Total = 33.3
Their sum = 25, which is approximately 75%.
Hence, Petroleum \& Solid Fuels together account for more than 60% in both regions.
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Question: 2
Which fuel’s proportion in the total energy demand increases over the decade 1990–2000 and decreases over the decade 2000–2010 for both the World and Asia?
Which fuel’s proportion in the total energy demand increases over the decade 1990–2000 and decreases over the decade 2000–2010 for both the World and Asia?
Show Hint
Break proportions down by decade for comparison when a question spans across multiple years.
Updated On: Aug 6, 2025
- Petroleum
- Natural Gas
- Solid Fuels
- Nuclear
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The Correct Option is A
Solution and Explanation
World:
1990: Petroleum = 50/150 = 33.3%,
2000: 70/200 = 35%,
2010: 80/250 = 32% (decrease).
Asia:
1990: 4/10 = 40%,
2000: 10/20 = 50%,
2010: 15/33.3 ≈ 45% (decrease).
1990: Petroleum = 50/150 = 33.3%,
2000: 70/200 = 35%,
2010: 80/250 = 32% (decrease).
Asia:
1990: 4/10 = 40%,
2000: 10/20 = 50%,
2010: 15/33.3 ≈ 45% (decrease).
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Question: 3
Which is the fuel whose proportion in the total energy demand will decrease continuously over the period 1990–2010, in Asia?
Which is the fuel whose proportion in the total energy demand will decrease continuously over the period 1990–2010, in Asia?
Show Hint
Use percentage share across each year to track continuous trends.
Updated On: Aug 6, 2025
- Natural Gas
- Solid Fuels
- Nuclear
- Hydropower
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The Correct Option is D
Solution and Explanation
Asia - Hydropower:
1990: 1/10 = 10%
2000: 1.5/20 = 7.5%
2010: 2/33.3 ≈ 6%
This shows a steady decline over the years.
1990: 1/10 = 10%
2000: 1.5/20 = 7.5%
2010: 2/33.3 ≈ 6%
This shows a steady decline over the years.
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Question: 4
Which is the fuel whose proportion to the total energy demand of the world will remain constant over the period 1990–2010 but whose proportion will increase in the total energy demand in Asia?
Which is the fuel whose proportion to the total energy demand of the world will remain constant over the period 1990–2010 but whose proportion will increase in the total energy demand in Asia?
Show Hint
When dealing with proportion questions, always compute relative percentages to observe constancy or change clearly.
Updated On: Aug 6, 2025
- Solid Fuels
- Nuclear
- Hydropower
- Natural Gas
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The Correct Option is D
Solution and Explanation
World – Natural Gas:
1990: 30/150 = 20%
2000: 40/200 = 20%
2010: 50/250 = 20%
So, proportion remains constant.
Asia – Natural Gas:
1990: 0.5/10 = 5%
2000: 2.5/20 = 12.5%
2010: 5/33.3 ≈ 15%
So, the proportion steadily increases.
1990: 30/150 = 20%
2000: 40/200 = 20%
2010: 50/250 = 20%
So, proportion remains constant.
Asia – Natural Gas:
1990: 0.5/10 = 5%
2000: 2.5/20 = 12.5%
2010: 5/33.3 ≈ 15%
So, the proportion steadily increases.
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