26. The most plausible explanation for the location of the Thar desert in western India is
A. the obstruction caused by the Aravalis to the rain-bearing wind that proceeds to the Ganga Valley
B. the evaporation of moisture by heat
C. the absence of mountains to the north of Rajasthan to cause orographic rainfall in it
D. that the moisture carried by the South-west monsoon is driven away by the dry upper air current
27. The northern boundary of the peninsular plateau of Indian runs parallel to the Ganga and the Yamuna from Rajmahal hills to a point near
A. Allahabad
B. Delhi
C. Gwalior
D. Jaipur
28. Which of the following food grain crops occupies the largest part of the cropped area in India?
A. Barley and maize
B. Jowar and bajra
C. Rice
D. Wheat
29. The number of major languages, recognized in the Indian Union as official language, are
A. 15
B. 22
C. 12
D. 9
30. The oldest rocks in India are reported from
A. Dharwar region, Karnataka
B. Aravalli range, Rajasthan
C. Vindhyan range, Madhya Pradesh
D. Siwalik range, Punjab