Highway Engineering
The walls which are necessary on the hill side of roadway where earth has to be retained from slipping is known as

parapet wall
retaining wall
None of these
breast wall

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Highway Engineering
The sequence of four stages of survey in a highway alignment is

map study, reconnaissance, preliminary survey and detailed survey
map study, preliminary survey, reconnaissance and detailed survey
reconnaissance, map study, preliminary survey and detailed survey
preliminary survey, map study, reconnaissance and detailed survey

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