31) The duty is largest

• (a) at the head of the main canal
• (b) at the head of the water course
• (c) on the field
• (d) at all place

32) The number of hectares of land irrigated for full growth of a given crop by supply of 1m3 per second of water continuously during the entire base period of crop, is called

• (a) duty
• (b) kor - watering
• (c) delta
• (d) crop water

33) The time (in days) that crop takes from the instant of its sowing to that of its harvest, is known as ................. period.

• (a) base
• (b) crop
• (c) kor

34) The whole period of cultivation from the time when irrigation water is first supplied for preparation of the ground to its last watering before harvesting, is called

• (a) base period
• (b) crop period
• (c) kor period
• (d) none of these

35) The duty of irrigation water goes on ................. as the water flows.

• (a) increasing
• (b) decreasing