121) The height of dowel above the road level should not be more than

• (a) 10 cm
• (b) 20 cm
• (c) 30 cm
• (d) 40 cm

122) The width of dowel is, usually, kept from

• (a) 0.1 m to 0.3 m
• (b) 0.3 m to 0.6 m
• (c) 0.6 m to 0.9 m
• (d) 0.9 m to 1.2 m

123) A spoil bank is formed when the

• (a) canal has steep bed slope
• (b) canal section is too large
• (c) volume of excavation is in excess of the embankment filling
• (d) canal alignment is meandrous

124) The borrow pits should, preferably, be taken from

• (a) the field on the right side of canal
• (b) the field on the left side of the canal
• (c) the central half width of the section of the canal
• (d) any one of the above

125) In case of small channels, the borrow pits should start from a distance not less than ................. from the toe of the embankment.

• (a) 2 m
• (b) 3 m
• (c) 4 m
• (d) 5 m