Answers to CE MC Questions (1992-2000)

NATURAL HAZARDS

EARTHQUAKES

Question	Ans.	Explanation
9748	C	A and D should have the least impact on human activities as they take place in remote areas. The greatest impact should be caused by flooding as it covers the whole agricultural region, including fields and villages. There may be concentration population around the productive area.
9841	C	Drought is usually caused by late coming of rain while earthquake is caused by plate movement. These cannot be controlled by human.
0056	B	Rather volcanic eruption can cause earthquakes. Choice (3), avalanche refers to the collapse of snow/ice on steep slopes.
9949	A	Aftershocks = 餘震
9809	D
9318	B	Migration of people is costly and most of them may not like to leave the earthquake-prone areas due to family ties.
9437	A	Block disintegration is only a kind of physical weathering.
9513	B	Earthquakes losses are usually more in developing countries due to the lack of money and technology to prevent earthquakes. After-shock relief service is also comparatively poorer.

FLOODING/DROUGHT

Question	Ans.	Explanation
9333	D	S is the lower course of Chang Jiang River.
9334	C	Water conservancy scheme exists along this part of the river but flooding is still inevitable.
9731	C	The purpose of building a flood retention reservoir is to control the large river flow from the tributaries of the river basin. It should get control over most of the tributaries. It is impossible to build a dam at location 2. Locations 1 and 4 only control small parts of the river basin. So the best is location 3.
9440	B	Rainfall is unevenly distributed in the lower course of Huang He. Most rain comes in summer.
9946	B	Region X is the Loess Plateau where loess deposit and serious soil erosion can be found.
9441	C	Reservoir may trap a lot of fine sediments. This will reduce the soil fertility in the lower course of the river.
9237	D	Refer to 9440.
0057	C	Sandstorms are commonly found in desert regions.
9950	D	Dredging of river bed in the lower course is a more effective means to reduce flooding as it can increase the carrying capacity of the river.
9507	C	Rather, deforestation increases surface runoff rather than infiltration.
9830	A	Rather, the presence of lakes can help reduce the possibility of flooding.
9234	D
9243	A	A flood usually occurs after heavy rain. So, the dotted lines should come later than the smooth line.
9751	B	Flood water in Huang He is never diverted to Chang Jiang. Rather, it has been led to Ziya River by the Renmen Shengli Canal.
9514	A	Similar question as 9830.

Others

Question	Ans.	Explanation
9846	C	Ash is produced after hillfire. This may in turn enrich the soil fertility.
9545	C