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161.

Retaining wall is constructed usually on the

hill side

valley side

162.

For walls less than 6 m in height, the thickness of the retaining wall at the bottom is equal to

A.	0.2 times the height	B.	0.3 times the height
C.	0.4 times the height	D.	0.5 times the height

163.

For walls more than 6 m in height, thickness of retaining wall at the bottom is equal to 0.4 times the height plus

A.	10 cm	B.	20 cm
C.	30 cm	D.	40 cm

164.

A wall constructed to retain the earth from slippage on the hill side of the roadway is called

A.	breast wall	B.	retaining wall
C.	parapet wall	D.	none of these

165.

A parapet well is usually constructed on the

hill side

valley side

166.

A breast wall is usually constructed on the hill side of the roadway.

Agree

Disagree

167.

The thickness of the parapet wall, on the valley side of the roadway, is usually kept as

A.	20 cm	B.	40 cm
C.	60 cm	D.	80 cm

168.

The height of the parapet wall is usually kept as

A.	25 cm	B.	50 cm
C.	75 cm	D.	100 cm

169.

A batter of 1 in 12 may be given to the retaining wall on the outside.

Correct

Incorrect

170.

The parapet walls are usually required on the valley side of the roadway, in order to

A.	retain the earth from slippage	B.	properly guide the vehicles to the roadway
C.	provide a good drainage system	D.	keep the road dry