481. Flash floods are associated with-

1. Thunderstorms
2. Cyclonic storms
3. Tsunami
4. Tornado

Option “1” is correct.
A flash flood is a rapid flooding of geomorphic low-lying areas: washes, rivers, dry lakes and basins. It may be caused by heavy rainassociated with a severe thunderstorm, hurricane, tropical storm, or meltwater from ice or snow flowing over ice sheets or snowfields.
482. The longest river in Asia is-

1. Indus
2. Yangtze
3. Hwang Ho
4. Ganga

Option “2” is correct.
The Yangtze River is the third longest worldwide and the longest river in the Asia with a length of 6,300 km. The other long Asian rivers are the Yellow River of 5,464 km, River Mekong of 4,909 km and Brahmaputra and Indus Rivers with a length of 2,900 km.
483. The Ruhr basin is the famous industrial region of-

1. China
2. Japan
3. Germany
4. United Kingdom

Option “3” is correct.
The Ruhr basin is the famous Industrial region of Germany. Formerly Germany’s coal-mining region, the Ruhrgebiet forms one of the largest conurbations in Europe with 5 million residents and is now known for its diverse and vibrant cultural scene.
484. In an area with annual rainfall of more than 200 cm and sloping hills which crop will be ideal?

1. Jute
2. Cotton
3. Maize
4. Tea

Option “4” is correct.
In an area with annual rainfall of more than 200 cm and sloping hills will be the ideal for tea plantation.
485. Monoculture is a distinct characteristic of-

1. Commercial grain farming
2. Shifting cultivation
3. Subsistence farming
4. Organic farming

Option “1” is correct.
Monoculture is a distinct characteristic of commercial grain farming. Monoculture is the agricultural practice of producing or growing a single crop or plant species over a wide area and for a large number of consecutive years.
486. Which of the following seas has the highest salinity?

1. Caspian sea
2. Mediterranean sea
3. Red sea
4. Dead sea

Option “4” is correct.
Dead sea has the highest salinity. The Dead Sea is 306 m (1,004 ft) deep, the deepest hypersaline lake in the world. With 34.2% salinity (in 2011), it is also one of the world’s saltiest bodies of water.
487. 90° E Ridge lies in-

1. Atlantic ocean
2. Indian ocean
3. Pacific ocean
4. Mediterranean ocean

Option “2” is correct.
90°E Ridge lies in Indian Ocean. The Ninety East Ridge (also rendered as Ninetyeast Ridge, 90E Ridge or 90°E Ridge) is a linear, age-progressive seamount chain in the Indian Ocean and is named for its near-parallel strike along the 90th meridian.
488. The clouds of the highest altitude are-

1. Altocumulus
2. Altostratus
3. Cumulus
4. Cirrostratus

Option “4” is correct.
The clouds of the highest altitude are Cirrostratus. Cirrostratus cloud is a high, thin, generally uniform stratiform genus-type, composed of ice-crystals. It is difficult to detect and is capable of forming halos when the cloud takes the form of thin cirrostratus nebulosus. The cloud has a fibrous texture with no halos if it is thicker cirrostratus fibratus.
489. The Black Mountains are located in-

1. Canada
2. Norway
3. Switzerland
4. U.S.A.

Option “4” is correct.
The Black Mountains are located in USA. The Black Mountains are a mountain range in western North Carolina, in the southeastern United States.
490. Which type of soil is found in the coniferous forests?

1. Chestnut
2. Podzol
3. Chernozem
4. Regur

Option “2” is correct.
Podzol type of soil is found in the coniferous forests. In soil science, podzols are the typical soils of coniferous, or boreal forests.
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