391: What causes wind to deflect toward left in the Southern hemisphere ?
(a) Rotation of the earth
(b) Magnetic field
(c) Temperature
(d) Pressure
Explanation:
The rotation of the Earth creates a force, termed Coriolis force, which acts upon wind and other objects in motion in very predictable ways. According to Newton's first law of motion, air will remain moving in a straight line unless it is influenced by an unbalancing force. The consequence of Coriolis force opposing pressure gradient acceleration is that the moving air changes direction. Instead of wind blowing directly from high to low pressure, the rotation of the Earth causes wind to be deflected off course. In the Northern Hemisphere, wind is deflected to the right of its path, while in the Southern Hemisphere it is deflected to the left.
392: Consider the map given below :
The places marked A, B, C and D in the map are respectively known for the cultivation of
(a) groundnut, ragi, tobacco and sugarcane
(b) groundnut, sugarcane, ragi and tobacco
(c) ragi, sugarcane, groundnut and tobacco
(d) ragi, groundnut, sugarcane and tobacco
Explanation:
'A' is Gujarat region known for groundnut cultivation.
'B' is known for Sugarcane cultivation in Western Maharashtra.
'C' is Orissa region - Ragi cultivation.
'D' is Andhra Pradesh region - Tobacco cultivation.
393: The time taken by the sun to revolve around the centre of our galaxy is
(a) 25 million years
(b) 100 million years
(c) 250 million years
(d) 500 million years
394: If there were no Himalayan ranges, what would have been the most likely geographical impact on India ?
1. Much of the country would experience the cold waves from Siberia.
2. Indo-gangetic plain would be devoid of such extensive alluvial soils.
3. The pattern of monsoon would be different from what it is at present.
Which of the statements given above is/are correct ?
(a) 1 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and, 3
Explanation:
The most significant gift from the Himalayas for the Indian subcontinent is its functioning as a climatic regulator. The Himalayan mountain ranges, working as a barrier are responsible for monsoon rains and unique climatic condition of six seasons of the subcontinent. The mountain ranges also protect the land lying in its south from the cold waves of Siberia.
The Indo-Gangetic plain is bound on the north by the abruply rising Himalayas, which feed its numerous rivers and are the source of the fertile alluvium deposited across the region by the two river systems. Hence, alluvial soils of North India owe its origin to Shiwalik range of the Himalayas.
The Himalayas forms a barrier for the monsoon winds, keeping them from traveling northwards, and causing heavy rainfall in the Terai region.
395: With reference to India, which one the following statements is not correct?
(a) About one-third of the area of the country records more than 750 millimeters of annual rainfall
(b) The dominant source of irrigation in the country is wells
(c) Alluvial soil is the predominant type of soil in the northern plans of the country
(d) The mountain areas accounts for about thirty percent of the surface area of the country